noaa-insect-22091 Last Chance Lake, East Greenland Holocene Chironomid Data and Inferred Temperature Axford, Y.; Levy, L.B.; Kelly, M.A.; Francis, D.R.; Hall, B.L.; Langdon, P.G.; Lowell, T.V. Last Chance Lake, East Greenland Holocene Chironomid Data and Inferred Temperature 2017-05-16 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/22091 Investigator Y. Axford Investigator L.B. Levy Investigator M.A. Kelly Investigator D.R. Francis Investigator B.L. Hall Investigator P.G. Langdon Investigator T.V. Lowell earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,raw,null,N,Orthocladiinae undiff earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,raw,null,N,Trissocladius earth science paleoclimate insect|paleolimnology age,null,null,calendar year before present,null,insect|paleolimnology,null,null,N,null earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,raw,null,N,Cricotopus/Orthocladius undiff earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,raw,null,N,Micropsectra earth science paleoclimate climate reconstructions|insect|paleolimnology temperature,midge assemblage,null,degree Celsius,Jul,climate reconstructions|insect|paleolimnology,anomalized,null,N,FRA06 earth science paleoclimate insect|paleolimnology total head capsules,null,null,count,null,insect|paleolimnology,raw,null,N,null earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,raw,null,N,Corynoneura earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,raw,null,N,Psectrocladius undiff earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,raw,null,N,Pseudodiamesa earth science paleoclimate climate reconstructions|insect|paleolimnology temperature,midge assemblage,null,degree Celsius,Jul,climate reconstructions|insect|paleolimnology,anomalized,null,N,FRA06-TR earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,raw,null,N,Cricotopus pulchripes type earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,raw,null,N,Heterotrissocladius earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,raw,null,N,Paracladius earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,raw,null,N,Psectrocladius barbimanus type earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,raw,null,N,Tanypodinae undiff earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,raw,null,N,Tanytarsini undiff earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,raw,null,N,Procladius earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,raw,null,N,P Monopsectrocladius earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,raw,null,N,Tanytarsus lugens/Corynocera oliveri earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,raw,null,N,Orthocladius consobrinus type earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,raw,null,N,Cricotopus sylvestris type earth science paleoclimate climate reconstructions|insect|paleolimnology temperature,midge assemblage,null,degree Celsius,Jul,climate reconstructions|insect|paleolimnology,anomalized,null,N,FOR15 earth science paleoclimate climate reconstructions|insect|paleolimnology age,null,null,calendar year before present,null,climate reconstructions|insect|paleolimnology,null,null,N,null earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,raw,null,N,Oliveridia/Hydrobaenus earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,raw,null,N,Parakieferiella nigra type earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,raw,null,N,Psectrocladius sordidellus type earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,raw,null,N,Eukieferiella earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,raw,null,N,no ID + unknown earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,raw,null,N,Cricotopus tremulus type earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,raw,null,N,Diamesa earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,raw,null,N,Psectrocladius nr barbimanus type earth science paleoclimate insecta population abundance earth science paleoclimate insecta other geoscientificInformation 11500 cal yr BP 621 cal yr BP Complete 70.909 70.909 -25.585 -25.585 690 690 Continent North America Greenland Last Chance Lake>LATITUDE 70.909>LONGITUDE -25.585 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 Yarrow Axford, Laura B. Levy, Meredith A. Kelly, Donna R. Francis, Brenda L. Hall, Peter G. Langdon and Thomas V. Lowell 2017 Boreas 10.1111/bor.12247 http://onlinelibrary.wiley.com/doi/10.1111/bor.12247/full

Much of Greenland experienced summers warmer than present in parts of the early to middle Holocene, during a precession-driven positive anomaly in summer insolation. However, the magnitude of that warmth remains poorly known, and its timing and spatial pattern are uncertain. Here we describe the first quantitative Holocene palaeotemperature reconstruction from central East Greenland based upon insect (chironomid) assemblages preserved in lake sediments. We postulate that landscapes like our study site, characterized by minimal soil and vegetation development through the Holocene and thus little influenced by some important secondary gradients, are especially well suited to the use of chironomids to reconstruct Holocene temperatures. The inferred timing of warmth at our study site near Scoresby Sund agrees well with other nearby evidence, including glacial geological reconstructions and temperatures inferred from precipitation isotopes at Renland ice cap, supporting the use of chironomids to reconstruct temperatures at this site. We infer highest temperatures from c. 10 to 5.5 ka, followed by gradual cooling after 5.5 ka and progressively colder and less productive conditions after 3.5 ka. Models based upon two independent training sets yield similar inferred temperature trends, and suggest an average summer temperature anomaly from c. 10 to 5.5 ka of 3 to 4C relative to the preindustrial last millennium. The estimated overall rate of Neoglacial cooling averaged over the period from 5.5 to 0.5 ka was 0.6 to 0.8C per thousand years, more than twice the rate previously estimated for the Arctic as a whole. Given strong apparent spatial variability in Holocene climate around the Arctic, and the utility of palaeoclimate data for improving climate and ice-sheet models, it should be a priority to further quantify past temperature changes around the margins of the Greenland Ice Sheet, where few quantitative reconstructions exist and future warming will affect global sea level. STUDY NOTES: Chironomid assemblage data and chironomid-inferred paleo-temperature from sediments collected in Last Chance Lake, East Greenland, for the past 11,500 years.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/insecta/chironomidae/northamerica/greenland/last-chance2017chironomid.txt Formatted Text Data File; Last Chance Lake Chironomid Assemblage Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/insecta/chironomidae/northamerica/greenland/last-chance2017temp.txt Formatted Text Data File; Last Chance Lake Chironomid-Inferred Temperature USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11