noaa-lake-6191 Stora Vidarvatn, Iceland 2,000 Year Chironomid and Geochemical Data Axford, Y.; Geirsdóttir, A.; Miller, G.H.; Langdon, P.G. Stora Vidarvatn, Iceland 2,000 Year Chironomid and Geochemical Data 2008-11-01 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/6191 Investigator Y. Axford Investigator A. Geirsdóttir Investigator G.H. Miller Investigator P.G. Langdon earth science paleoclimate paleolimnology carbon,sediment,null,weight percent,null,paleolimnology,null,elemental analysis,N,null earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Chironomus anthracinus type earth science paleoclimate climate reconstructions|insect|paleolimnology depth,null,null,centimeter,null,climate reconstructions|insect|paleolimnology,null,null,N,null earth science paleoclimate paleolimnology mineral matter,sediment,null,weight percent,null,paleolimnology,null,null,N,calculated as residual of %C/0.4+%Bsi earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Corynoneura scutellata earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Heterotrissocladius sp. earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Psectrocladius sordidellus earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Thienemanniella sp. earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Micropsectra sp. earth science paleoclimate insect|paleolimnology detrended correspondence analysis axis,null,null,dimensionless,null,insect|paleolimnology,null,null,N,DCA axis 1 of chironomid assemblage earth science paleoclimate paleolimnology biogenic silica,sediment,null,percent,null,paleolimnology,null,spectrophotometry,N,method of Mortlock and Froelich 1989 with 10% Na2CO3 earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Procladius sp. earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Cricotopus sp. Type I earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Paracladopelma sp. earth science paleoclimate paleolimnology carbon/nitrogen,sediment,null,dimensionless,null,paleolimnology,null,elemental analysis,N,total carbon/total nitrogen earth science paleoclimate paleolimnology delta 13C,sediment,null,per mil VPDB,null,paleolimnology,null,isotope ratio mass spectrometry,N,null earth science paleoclimate insect|paleolimnology total head capsules,null,null,count,null,insect|paleolimnology,null,null,N,null earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Tanytarsini earth science paleoclimate insect|paleolimnology total head capsules,null,null,count per gram,null,insect|paleolimnology,null,null,N,null earth science paleoclimate insect|paleolimnology detrended correspondence analysis axis,null,null,dimensionless,null,insect|paleolimnology,null,null,N,DCA axis 2 of chironomid assemblage earth science paleoclimate climate reconstructions|insect|paleolimnology age,null,null,year Common Era,null,climate reconstructions|insect|paleolimnology,null,null,N,null earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Orthocladius sp. Type A earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Chironomini larvula earth science paleoclimate paleolimnology nitrogen,sediment,null,weight percent,null,paleolimnology,null,elemental analysis,N,null earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Diamesa sp. earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Cricotopus sp. type P earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Cricotopus sp. earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Orthocladiinae earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Tanytarsus lugens type earth science paleoclimate climate reconstructions|insect|paleolimnology temperature,midge assemblage,null,degree Celsius,Aug,climate reconstructions|insect|paleolimnology,null,regression analysis,N,linear regression earth science paleoclimate insect|paleolimnology identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Metriocnemus fuscipes earth science paleoclimate paleolimnology population abundance geoscientificInformation Air Temperature Reconstruction Little Ice Age (LIA) PAGES 2k Network PAGES Arctic 2k 1843 cal yr BP -57 cal yr BP Complete 66.2372 66.2372 -15.8347 -15.8347 151 151 Continent Europe Northern Europe Iceland Stora Vidarvatn>LATITUDE 66.2372>LONGITUDE -15.8347 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

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Boulder CO 80305-3328 USA online ASCII Yarrow Axford, Aslaug Geirsdottir, Gifford H. Miller, Peter G. Langdon 2009 Journal of Paleolimnology 41 1 7-24 10.1007/s10933-008-9251-1 http://springer.libdl.ir/article/10.1007/s10933-008-9251-1

A sedimentary record from lake Stora Vidarvatn in northeast Iceland records environmental changes over the past 2000 years. Downcore data include chironomid (Diptera: Chironomidae) assemblage data and total organic carbon, nitrogen, and biogenic silica content. Sample scores from detrended correspondence analysis (DCA) of chironomid assemblage data are well correlated with measured temperatures at Stykkisholmur over the 170 year instrumental record, indicating that chironomid assemblages at Stora Vidarvatn have responded sensitively to past temperature changes. DCA scores appear to be useful for quantitatively inferring past temperatures at this site. In contrast, a quantitative chironomid-temperature transfer function developed for northwestern Iceland does a relatively poor job of reconstructing temperature shifts, possibly due to the lake's large size and depth relative to the calibration sites or to the limited resolution of the subfossil taxonomy. The pre-instrumental climate history inferred from chironomids and other paleolimnological proxies is supported by prior inferences from historical documents, glacier reconstructions, and paleoceanographic studies. Much of the first millennium AD was relatively warm, with temperatures comparable to warm decades of the twentieth century. Temperatures during parts of the tenth and eleventh centuries AD may have been comparably warm. Biogenic silica concentrations declined, carbon:nitrogen ratios increased, and some chironomid taxa disappeared from the lake between the thirteenth and nineteenth centuries, recording the decline of temperatures into the Little Ice Age, increasing soil erosion, and declining lake productivity. All the proxy reconstructions indicate that the most severe Little Ice Age conditions occurred during the eighteenth and nineteenth centuries, a period historically associated with maximum sea-ice and glacier extent around Iceland. STUDY NOTES: Chironomids and other lake sediment proxies from Stora Vidarvatn, Iceland, and DCA-inferred Raufarhofn August temperature. Core 05-SVID-SC was obtained from 20.6 m water depth in summer 2005.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/iceland/stora-vidarvatn2008.xls GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/iceland/stora-vidarvatn2008.txt USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11