Moose Lake, Alaska 6000 Year Midge Inferred July Temperature Clegg, B.F.; Clarke, G.H.; Chipman, M.L.; Chou, M.; Walker, I.R.; Tinner, W.; Hu, F.S. Clegg, B.F. Clarke, G.H. Chipman, M.L. Chou, M. Walker, I.R. Tinner, W. Hu, F.S. Air Temperature Reconstruction Arctic thermal maximum earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,count,null,insect|paleolimnology,raw,null,N,Dicrotendipes) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,count,null,insect|paleolimnology,raw,null,N,Microtendipes) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,count,null,insect|paleolimnology,raw,null,N,Phaenopsectra flavipes type) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,count,null,insect|paleolimnology,raw,null,N,other Tanytarsina) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,count,null,insect|paleolimnology,raw,null,N,Endochironomus) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,count,null,insect|paleolimnology,raw,null,N,Paratendipes) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,count,null,insect|paleolimnology,raw,null,N,Limnophyes) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,count,null,insect|paleolimnology,raw,null,N,Nanocladius) earth science/paleoclimate/insect|paleolimnology (total head capsules,null,null,count,null,insect|paleolimnology,raw,null,N,sum of identified headcapsules) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,count,null,insect|paleolimnology,raw,null,N,Corynocera ambigua) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,count,null,insect|paleolimnology,raw,null,N,Pseudochironomus) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,count,null,insect|paleolimnology,raw,null,N,Pagastiella) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,count,null,insect|paleolimnology,raw,null,N,Stictochironomus) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,count,null,insect|paleolimnology,raw,null,N,Psectrocladius (Mono-)) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,count,null,insect|paleolimnology,raw,null,N,Cladopelma) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,count,null,insect|paleolimnology,raw,null,N,Parachironomus) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,count,null,insect|paleolimnology,raw,null,N,Parakiefferiella triquetra) earth science/paleoclimate/climate reconstructions|insect|paleolimnology (surface air temperature,midge assemblage,null,degree Celsius,Jul,climate reconstructions|insect|paleolimnology,null,null,N,null) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,count,null,insect|paleolimnology,raw,null,N,Polypedilum) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,count,null,insect|paleolimnology,raw,null,N,Corynoneura/Thienemanniella) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,count,null,insect|paleolimnology,raw,null,N,Psectrocladius (Allo-/Meso-)) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,count,null,insect|paleolimnology,raw,null,N,other Pentaneurini) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,count,null,insect|paleolimnology,raw,null,N,Ceratopogonidae) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,count,null,insect|paleolimnology,raw,null,N,unidentified headcapsules) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,count,null,insect|paleolimnology,raw,null,N,Einfeldia) 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/climate reconstructions|insect|paleolimnology (age,null,null,calendar year before 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estimate of calibrated 14C age) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,count,null,insect|paleolimnology,raw,null,N,Micropsectra) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,count,null,insect|paleolimnology,raw,null,N,Cryptotendipes) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,count,null,insect|paleolimnology,raw,null,N,Glyptotendipes) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,count,null,insect|paleolimnology,raw,null,N,Parakiefferiella sp.B/bathophila) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,count,null,insect|paleolimnology,raw,null,N,Psectrocladius (Psectrocladius)) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,count,null,insect|paleolimnology,raw,null,N,Psectrocladius (Mono-) septentrionalis) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,count,null,insect|paleolimnology,raw,null,N,1st instar headcapsules) earth science/paleoclimate/climate reconstructions|insect|paleolimnology (surface air temperature,midge assemblage,one standard error,degree Celsius,Jul,climate reconstructions|insect|paleolimnology,null,null,N,sample-specific standard error of prediction) 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/insect|paleolimnology (identified midge,null,null,count,null,insect|paleolimnology,raw,null,N,Cladotanytarsus mancus type) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,count,null,insect|paleolimnology,raw,null,N,Sergentia) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,count,null,insect|paleolimnology,raw,null,N,Cricotopus/Orthocladius) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,count,null,insect|paleolimnology,raw,null,N,Heterotrissocladius) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,count,null,insect|paleolimnology,raw,null,N,Zalutschia sp.1) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,count,null,insect|paleolimnology,raw,null,N,Labrundinia) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,count,null,insect|paleolimnology,raw,null,N,Procladius) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,count,null,insect|paleolimnology,raw,null,N,Chaoborus mandibles) earth science/paleoclimate/insecta (Moose Lake Alaska>LATITUDE 61.3742>LONGITUDE -143.5988) Despite their importance for evaluating anthropogenic climatic change, quantitative temperature reconstructions of the Holocene remain scarce from northern high latitude regions. We conducted high-resolution midge analysis on the sediments of the past 6000 years from a lake in south-central Alaska. Results were used to estimate summer temperature (TJuly) variations on the basis of a midge temperature transfer function. The TJuly estimates from the near-surface samples are broadly consistent with instrumental and treering-based temperature data. Together with previous studies, these results suggest that midge assemblages are more sensitive to small shifts in summer temperature (~0.5°C) than indicated by the typical error range of midge temperature transfer functions (~1.5°C). A piecewise linear regression analysis identifies a significant change point at ca. 4000 years before present (cal. BP) in our TJuly record, with a decreasing trend after this point. Episodic TJuly peaks (~14.5°C) between 5500 and 4200 cal. BP and the subsequent climatic cooling may have resulted from decreasing summer insolation associated with the precessional cycle. Centennial-scale climatic cooling of up to 1°C occurred around 4000, 3300, 1800-1300, 600, and 250 cal. BP. These cooling events were more pronounced and lasted longer during the last two millennia than between 2000-4000 cal. BP. Some of these events have counterparts in climatic records from elsewhere in Alaska and other regions of the Northern Hemisphere, including several roughly synchronous with known grand minima in solar irradiance. Over the past 2000 years, our TJuly record displays patterns similar to those inferred from a wide variety of temperature proxy indicators at other sites in Alaska, including climatic fluctuations coeval with the Little Ice Age (~245 cal. BP), the Medieval Climate Anomaly (~1000 cal. BP), and the First Millennial Cooling (~1400 cal. BP). To our knowledge, this study offers the first high-resolution, quantitative record of summer-temperature variation that spans longer than the past 2000 years from the high-latitude regions around the North Pacific. STUDY NOTES: Multi-decadal midge assemblage and midge-inferred July temperature data for Moose Lake, Alaska, for the past 6000 years. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Clegg, B.F. Investigator : Clarke, G.H. Investigator : Chipman, M.L. Investigator : Chou, M. Investigator : Walker, I.R. Investigator : Tinner, W. Investigator : Hu, F.S. 2010-08-09 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/9953 https://www1.ncdc.noaa.gov/pub/data/paleo/insecta/chironomidae/northamerica/usa/alaska/moose2010.xls https://www1.ncdc.noaa.gov/pub/data/paleo/insecta/chironomidae/northamerica/usa/alaska/moose2010.txt https://www1.ncdc.noaa.gov/pub/data/paleo/insecta/chironomidae/northamerica/usa/alaska/moose2010.xls https://www1.ncdc.noaa.gov/pub/data/paleo/insecta/chironomidae/northamerica/usa/alaska/moose2010.txt English https://www.ncdc.noaa.gov/paleo/study/9953 https://www1.ncdc.noaa.gov/pub/data/paleo/insecta/chironomidae/northamerica/usa/alaska/moose2010.xls https://www1.ncdc.noaa.gov/pub/data/paleo/insecta/chironomidae/northamerica/usa/alaska/moose2010.txt Clegg, B.F., G.H. Clarke, M.L. Chipman, M. Chou, I.R. Walker, W. Tinner, and F.S. Hu. 2010. Six Millennia of Summer Temperature Variation Based on Midge Analysis of Lake Sediments from Alaska. Quaternary Science Reviews., Vol. 29, Issues 23-24, November 2010, pp. 3308-3316. DOI: 10.1016/j.quascirev.2010.08.001 START YEAR: 6007 cal yr BP * END YEAR: -20 cal yr BP -143.5988 61.3742 -143.5988 61.3742