noaa-lake-6194 Ongoke Lake, Alaska 2,000 Year Diatom, Chironomid, and Geochemical Data Chipman, M.L.; Clarke, G.H.; Clegg, B.F.; Gregory-Eaves, I.; Hu, F.S. Ongoke Lake, Alaska 2,000 Year Diatom, Chironomid, and Geochemical Data 2008-11-01 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/6194 Investigator M.L. Chipman Investigator G.H. Clarke Investigator B.F. Clegg Investigator I. Gregory-Eaves Investigator F.S. Hu earth science paleoclimate climate reconstructions|paleolimnology lake level,diatom assemblage,null,meter,null,climate reconstructions|paleolimnology,null,null,N,water depth of lake earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes nodosa earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes oblongella earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes saccula earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Aulacoseira ambigua earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Aulacoseira distans earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Corynocera sp. earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes conspicua earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes hintzii earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cymbella sp. earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cymbella cymbiformis earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cymbella falisensis earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cymbella minuta earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cymbella naviculiformis earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Diploneis oblongella earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Eunotia exigua earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Eunotia pectinalis var. minor earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Fragilaria construens var. pumilla earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Fragilaria elliptica earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Fragilaria leptostauron earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Gomphonema angustum earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula declivis earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula radiosa earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula rhynchocephala aff. rhynchocephala earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula schmassmannii earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula seminuloides earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula subminuscola earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Neidium sp. earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Neidium ampliatum earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Nitzschia amphibia earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Nitzschia fonticola earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Stauroneis sp. earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Synedra ulna earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula porifera var. opportuna earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes oestrupii earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes pseudoswazi earth science paleoclimate climate reconstructions|insect|paleolimnology age at sample end,null,null,year Common Era,null,climate reconstructions|insect|paleolimnology,null,null,N,null earth science paleoclimate paleolimnology mineral matter,sediment,null,weight percent,null,paleolimnology,null,loss on ignition,N,Percent non-BSi lithics and ash (% LOI 950 °C minus BSi concentration) earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes bicapitata earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes clevei earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes linearis earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cocconeis placentula earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cyclotella comensis aff. comensis earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cyclotella gordonensis earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cymbella laponica earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Diatoma moniliformis earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Eunotia muscicola earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Eunotia tenella earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Frustulia rhomboides earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Fragiliaria bicapitata earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Fragilaria capucina earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Fragilaria lapponica earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula capitata var. lueneburgensis earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula cocconeiformis earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula cryptocephala earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula difficilima earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Naviculadicta sp. 2 earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Naviculadicta circumborealis earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Neidium iridis earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Nitzschia linearis earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Nitzschia sociabilis earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Pinnularia gibba earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Rhoicosphenia abbreviata earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Kraskella kriegeriana earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes pusilla earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes reversa earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes rosenstockii earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes stolida earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Amphipleura pellucida earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Aulacoseira lirata var. biseriata earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,other chironomids earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes flexella earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes laevis earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes lauenbergiana earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes marginulata earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Brachysira vitrea earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cocconeis placentula var. lineata earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cyclotella meneghiniana earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cymbella affinis earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cymbella descripta earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cymbella gaeumannii earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cymbella microcephala earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cymbella sinuata earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Diatoma anceps earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Epithemia sorex earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Eunotia incisa earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Fragilaria capucina var. austriaca earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Fragilaria capucina var. vaucherie earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Fragilaria lata earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Fragilaria pinnata earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Gomphonema gracile earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula cryptotenella earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula disjuncta earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula pseudoventralis earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula subrotundata earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Neidium alpinum earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Nitzschia sp. earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Nitzschia gracilis earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Nitzschia palea earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Pinnularia borealis earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Stauroneis noblis var. gracilis earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Surirella angusta earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Synedra acus earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Synedra tabulata earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Tabellaria fenestrata earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Tabellaria quadriseptata earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cyclotella ocellata earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes semiaperta earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes suchlandtii earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes ventralis earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Amphora subcapitata earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Aulacoseira sp. earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Aulacoseira italica var. valida earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Aulacoseira perglabra var. floriniae earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Brachysira brebisonii earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Brachysira neoexilis earth science paleoclimate climate reconstructions|insect|paleolimnology age at sample start,null,null,year Common Era,null,climate reconstructions|insect|paleolimnology,null,null,N,null earth science paleoclimate paleolimnology density,sediment,null,gram per cubic centimeter,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology carbon/nitrogen,sediment,null,dimensionless,null,paleolimnology,null,elemental analysis,N,total organic carbon/total organic nitrogen earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes lanceolata earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes laterostrata earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes levanderi earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Caloneis bacillum earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cyclotella comensis earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cymbella cesatii earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cymbella cuspidata earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cymbella elginensis earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Denticula kuetzingii earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Eunotia naegelii earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Eunotia praerupta earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Fragilaria/Hannaea arcus earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Fragilaria oldenburgiana earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Gomphonema minutum earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Gomphonema pseudotenellum earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula sp. earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula absoluta earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula contenta earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula eidrigeana earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula jaernefeldtii earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula/Luticola kotschyi earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula leptostriata earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula seminulum earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Nitzschia elegantula earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Synedra/Fragilaria nana earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Amphora libyca earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Pinnularia streptoraphe earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes petersenii earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes rossii earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes scotica earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes subatomoides earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Amphora pediculus earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Aulacoseira nygaardii earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Aulacoseira subarctica earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Aulacoseira tenella earth science paleoclimate paleolimnology organic matter,sediment,null,weight percent,null,paleolimnology,null,loss on ignition,N,loss on ignition 550 degrees C for four hours earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Sergentia sp. earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes bioseleltiana earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes carrisima earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes helvetica earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes impexiformis earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cyclotella stelligera c.f. stelligera earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cymbella amphicephala earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cymbella cistula earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cymbella paucistriata earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Diatoma tenue earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Diploneis ovalis earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Eunotia acus earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Fragilaria brevistriata earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Fragilaria capucina var. perminuta earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Fragilaria construens earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Fragilaria construens var. mesolepta earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Fragilaria robusta earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Gomphonema sp. earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Melosira varians earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula bremensis earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula capitata var. hungarica earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula clementiodes earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula laevissima earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula radiosa var. parva earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula subatomoides earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula subtillisima earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula tuscula earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Nitzschia frustulum earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Nitzschia inconspicua earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Nitzschia paleacea earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Nitzschia perminuta earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Nitzschia pura earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Nitzschia pusilla earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Pinnularia brandeli earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Pinnularia major earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Rhopalodia gibba earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Stauroneis anceps earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Stauroneis phoenicenteron earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Synedra sp. earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Synedra/Fragilaria parasitica earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Synedra/Fragilaria rumpens earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Synedra rumpens va. scotica earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Fragilaria pseudoconstruens earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Aulacoseira crassipunctata earth science paleoclimate climate reconstructions|insect|paleolimnology depth at sample end,null,null,centimeter,null,climate reconstructions|insect|paleolimnology,null,null,N,null earth science paleoclimate paleolimnology biogenic silica,sediment,null,milligram per gram,null,paleolimnology,null,spectrophotometry,N,method of Mortlock and Froelich 1989 with 10% Na2CO3 earth science paleoclimate paleolimnology planktic:benthic diatom,null,null,dimensionless,null,paleolimnology,null,null,N,ratio of # of planktonic and tychoplanktonic diatoms to # of benthic diatoms earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes curtissima earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cocconeis placentula var. euglypta earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cyclotella bodanica var. aff. lemanica earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cyclotella pseudostelligera earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cyclotella tripartita earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cymbella gracilis earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cymbella silesiaca earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Diatoma mesodon earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Diploneis sp. earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Eunotia faba earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Fragilaria construens var. venter earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Fragilaria exigua earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Fragilaria parasitica earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Fragilaria virescens earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Gomphonema truncatum earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula mediocris earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula medioconvexa earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula submuralis earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula trivialis earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Naviculadicta sp. 1 earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Nitzschia dissipata earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Pinnularia sp. earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Pinnularia gibba var. linearis earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Reimeria sinuata earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Fragilaria capucina var. gracilis earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Pinnularia viridis earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes peragalli earth science paleoclimate climate reconstructions|paleolimnology lake level,diatom assemblage,unspecified margin of error,meter,null,climate reconstructions|paleolimnology,null,null,N,water depth of lake earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Asterionella formosa earth science paleoclimate paleolimnology total diatoms,null,null,count per gram,null,paleolimnology,null,null,N,Diatom concentration expressed as 10^8 diatom frustules/g of dry sediment earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes altaica earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes calcar earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes didyma earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cyclotella kuetzingiana var. radiosa/C. rossi earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Diploneis finnica earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Epithemia adnata earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Eunotia flexuosa earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Fragilaria capucina var. amphicephala earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula atomus earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula explanata earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula globulifera earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula minuscula earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula modica earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula pseudocutiformis earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula pupula earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Nitzschia angustata earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Pinnularia interrupta earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Pinnularia microstauron earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Pinnularia subcapitata earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Surirella sp. earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Synedra/Fragilaria tenera earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Tabellaria flocculosa earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes minuscula earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes minutissima earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes nitidiformis earth science paleoclimate climate reconstructions|insect|paleolimnology depth at sample start,null,null,centimeter,null,climate reconstructions|insect|paleolimnology,null,null,N,null earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes sp. earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes exigua earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes kreigeri earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes lacus-vulcani earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Caloneis sp. earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Caloneis silicula earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cyclotella stelligera earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cyclotella stelligeroides earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cymbella incerta earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cymbells perpusilla earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Diploneis elliptica earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Eunotia sp. earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Fragilaria sp. earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Fragilaria construens var. binolis earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Gomphonema acuminatum earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Gomphonema parvulum earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Meridion circulare earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula agrestis earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula augustata earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula arvensis earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula capitata earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula clementis earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula dententa earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula minima earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula pusio earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula rhynchocephala earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula ventralis earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula vitiosa earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Neidium bisulcatum earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Neidium dubium earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Neidium septentrionale earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Pinnularia divergentissima earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Stauroneis smithii earth science paleoclimate paleolimnology identified diatom,null,null,percent,null,paleolimnology,null,null,N,Stenopterobia curvula earth science paleoclimate paleolimnology population abundance geoscientificInformation PAGES 2k Network PAGES Arctic 2k 1998 cal yr BP -54 cal yr BP Complete 59.25 59.25 -159.416 -159.416 75 75 Continent North America United States Of America Alaska Ongoke Lake>LATITUDE 59.25>LONGITUDE -159.416 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

325 Broadway, E/NE31

Boulder CO 80305-3328 USA online ASCII Chipman, M.L., G.H. Clarke, B.F. Clegg, I. Gregory-Eaves, and F.S. Hu 2009 Journal of Paleolimnology 41 1 57-75 0.1007/s10933-008-9257-8

We analyzed sediments of the past 2000 years from Ongoke Lake, southwest Alaska, for organic carbon, organic nitrogen, biogenic silica (BSi), and diatom assemblages at decadal to centennial resolution to infer limnological changes that may be related to climatic variation in southwestern Alaska. The chronology is based on a 210Pb profile from bulk sediments and nine AMS 14C ages from terrestrial plant macrofossils. Four of the 14C ages span a core depth interval of 60.5 cm but are statistically indistinguishable from one another with a mean of ~1300 AD, which compromises the determination of temporal trends at Ongoke Lake and comparison with other paleoclimate records. The diatom record suggests changes in the duration of ice cover and strength of thermal stratification that are probably related to temperature variation. This variation includes a cold interval around the first millennium cooling (FMC) and a warm interval spanning the medieval climate anomaly (MCA). However, the lake-sediment record shows no clear signals of temperature variation for the period of the Little Ice Age (LIA) or the twentieth century. Climatic changes during these periods may have been manifested through effective-moisture (precipitation minus evapotranspiration) variation in the Ongoke Lake area. We estimate water depths and infer effective-moisture fluctuations by applying a regional transfer function to our diatom record. Together with inferences from diatom autecologies, this water-depth reconstruction suggests that effective moisture increased steadily from 50 BC to 350 AD, which was followed by relatively dry conditions between 550 and 750 AD and relatively wet conditions between 750 and 1450 AD. Effective moisture was low from ~1450 to 1850 AD, coinciding with the LIA; an alternative age model places this interval between ~1315 and 1850 AD. During the past 150 years, effective moisture increased, with estimated water depths reaching peak values in the second half of the twentieth century. This study offers the first paleolimnological record for inferring centennial-scale climatic variation over the past two millennia from southwestern Alaska. STUDY NOTES: High resolution diatom and chironomid counts and geochemical data (bulk density, LOI, lithics, C/N, biogenic Si) for Ongoke Lake, Alaska, for the past 2000 years.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/ongoke2008.xls GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/ongoke2008.txt USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11