Northeastern USA Little Ice Age Temperature and Precipitation Reconstructions Gajewski, K.J. Gajewski, K.J. Air Temperature Reconstruction Little Ice Age (LIA) Precipitation Reconstruction earth science/paleoclimate/climate reconstructions|pollen (age,null,null,calendar year before present,null,climate reconstructions|pollen,null,null,N,present defined as 1975 A.D.) earth science/paleoclimate/climate reconstructions|pollen (precipitation,null,null,millimeter,annual,climate reconstructions|pollen,null,regression analysis,N,calibration data set: local instrumental data; multiple linear regression) earth science/paleoclimate/climate reconstructions|pollen (surface temperature,null,null,degree Celsius,Jun-Aug,climate reconstructions|pollen,null,regression analysis,N,calibration data set: local instrumental data; multiple linear regression) earth science/paleoclimate/reconstructions earth science/paleoclimate/reconstructions (Conroy Lake (CONROY)>LATITUDE 46.28333>LONGITUDE -67.88333) (Dark Lake (DARKLAKE)>LATITUDE 45.275>LONGITUDE -91.475) (Basin Pond (BASINPND)>LATITUDE 44.47>LONGITUDE -70.05) (Lake of the Clouds [Minnesota] (LKCLDSH)>LATITUDE 48>LONGITUDE -91.116667) (Little Pine Lake (LITTLPIN)>LATITUDE 45.28333>LONGITUDE -91.48333) (Clear Pond [New York] (CLRPNDNY)>LATITUDE 43.75>LONGITUDE -74.016667) (Hell's Kitchen Lake (HELLSKIT)>LATITUDE 46.18333>LONGITUDE -89.7) (Ruby Lake (RUBYLAKE)>LATITUDE 45.26667>LONGITUDE -91.45834) Well-dated pollen profiles from six sites from Maine to Minnesota record vegetation changes indicative of summer temperature and annual precipitation variations over the past 2000 yr. Laminations in the sediment provide accurate time control. Multiple regression techniques were used to calculate calibration functions from a spatial network of modern pollen and climate data. When applied to the six pollen diagrams, these calibration functions yielded estimates that show a long-term trend toward lower summer temperature. Superimposed on this long-term trend are short-term fluctuations that are frequently in phase at the sites. Departures from the long-term cooling trend are positive around 1500 yr ago (indicating relative warmth) and negative between 200 and 500 yr ago (indicating relative cold). Annual precipitation showed a slight increase at several sites during the past 1000 yr relative to the previous 1000 yr. STUDY NOTES: Mean summer (JJA) temperatures and Total annual precipitation for the past 2000 years reconstructed from pollen from lakes with laminated sediments. The laminations ensure a more precise time control than normally obtained from radiocarbon. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Gajewski, K.J. 1993-01-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/6221 https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/recons/clear1988.txt https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/recons/liadata.txt https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/recons/clouds1988.txt https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/recons/ruby1988.txt https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/recons/conroy1988.txt https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/recons/dark1988.txt https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/recons/hells1988.txt https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/recons/basin1988.txt https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/recons/pine1988.txt https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/recons/clear1988.txt https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/recons/liadata.txt https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/recons/clouds1988.txt https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/recons/ruby1988.txt https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/recons/conroy1988.txt https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/recons/dark1988.txt https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/recons/hells1988.txt https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/recons/basin1988.txt https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/recons/pine1988.txt English https://www.ncdc.noaa.gov/paleo/study/6221 https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/recons/clear1988.txt https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/recons/liadata.txt https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/recons/clouds1988.txt https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/recons/ruby1988.txt https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/recons/conroy1988.txt https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/recons/dark1988.txt https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/recons/hells1988.txt https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/recons/basin1988.txt https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/recons/pine1988.txt K. Gajewski1988Late holocene climate changes in eastern North America estimated from pollen dataQuaternary Research293255-26210.1016/0033-5894(88)90034-8http://www.sciencedirect.com/science/article/pii/0033589488900348 K. Gajewski1987Climatic impacts on the vegetation of eastern North America during the past 2000 yearsPlant Ecology (formerly Vegetatio)683179-19010.1007/BF00114719http://link.springer.com/article/10.1007/BF00114719 START YEAR: 2040 cal yr BP * END YEAR: 7 cal yr BP -91.48333 43.75 -67.88333 48