Greenland 11,500 Year Temperature Reconstruction Kobashi, T.; Menviel, L.; Jeltsch-Thömmes, A.; Vinther, B.M.; Box, J.E.; Muscheler, R.; Nakaegawa, T.; Pfister, P.L.; Döring, M.; Leuenberger, M.; Wanner, H.; Ohmura, A. Kobashi, T. Menviel, L. Jeltsch-Thömmes, A. Vinther, B.M. Box, J.E. Muscheler, R. Nakaegawa, T. Pfister, P.L. Döring, M. Leuenberger, M. Wanner, H. Ohmura, A. Air Temperature Reconstruction earth science/paleoclimate/climate forcing (volcanic forcing,null,null,watt per square meter,null,climate forcing,null,null,N,null) earth science/paleoclimate/paleoclimatic modeling (surface air temperature,null,null,degree Celsius,null,paleoclimatic modeling,anomalized,null,N,null) earth science/paleoclimate/climate reconstructions|ice cores (surface air temperature,delta 15N excess,two standard deviations,degree Celsius,null,climate reconstructions|ice cores,null,null,N,null) earth science/paleoclimate/paleoclimatic modeling (age,null,null,calendar year before present,null,paleoclimatic modeling,null,null,N,null) earth science/paleoclimate/climate reconstructions|ice cores (age,null,null,calendar year before present,null,climate reconstructions|ice cores,null,null,N,null) earth science/paleoclimate/climate forcing (age,null,null,calendar year before present,null,climate forcing,null,null,N,null) earth science/paleoclimate/paleoclimatic modeling (surface air temperature,null,null,degree Celsius,null,paleoclimatic modeling,anomalized,null,N,no volcanic) earth science/paleoclimate/paleoclimatic modeling (surface air temperature,null,null,degree Celsius,null,paleoclimatic modeling,differenced,null,N,volcanic-no volcanic difference) earth science/paleoclimate/climate reconstructions|ice cores (surface air temperature,delta 15N excess,null,degree Celsius,null,climate reconstructions|ice cores,null,null,N,null) earth science/paleoclimate/reconstructions (GISP2>LATITUDE 72.6>LONGITUDE -38.5) Solar variability has been hypothesized to be a major driver of North Atlantic millennial-scale climate variations through the Holocene along with orbitally induced insolation change. However, another important climate driver, volcanic forcing has generally been underestimated prior to the past 2,500 years partly owing to the lack of proper proxy temperature records. Here, we reconstruct seasonally unbiased and physically constrained Greenland Summit temperatures over the Holocene using argon and nitrogen isotopes within trapped air in a Greenland ice core (GISP2). We show that a series of volcanic eruptions through the Holocene played an important role in driving centennial to millennial-scale temperature changes in Greenland. The reconstructed Greenland temperature exhibits significant millennial correlations with K+ and Na+ ions in the GISP2 ice core (proxies for atmospheric circulation patterns), and d18O of Oman and Chinese Dongge cave stalagmites (proxies for monsoon activity), indicating that the reconstructed temperature contains hemispheric signals. Climate model simulations forced with the volcanic forcing further suggest that a series of large volcanic eruptions induced hemispheric-wide centennial to millennial-scale variability through ocean/sea-ice feedbacks. Therefore, we conclude that volcanic activity played a critical role in driving centennial to millennial-scale Holocene temperature variability in Greenland and likely beyond. STUDY NOTES: Volcanic forcing time series and Greenland temperature reconstruction, plus modeled Northern Hemisphere average temperature, for the past 11,500 years. Reconstructions are based on argon and nitrogen isotopes from trapped air in the GISP2 Greenland ice core. Greenland Temperature file updated 12/02/2017 - a preliminary version had inadvertently been contributed. Data here are those plotted in Fig.2a. d15N file (Kobashi et al. 2008) also added 12/02/2017. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Kobashi, T. Investigator : Menviel, L. Investigator : Jeltsch-Thömmes, A. Investigator : Vinther, B.M. Investigator : Box, J.E. Investigator : Muscheler, R. Investigator : Nakaegawa, T. Investigator : Pfister, P.L. Investigator : Döring, M. Investigator : Leuenberger, M. Investigator : Wanner, H. Investigator : Ohmura, A. 2017-05-05 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/22057 https://www1.ncdc.noaa.gov/pub/data/paleo/reconstructions/kobashi2017/kobashi2017nh.txt https://www1.ncdc.noaa.gov/pub/data/paleo/reconstructions/kobashi2017/kobashi2017d15n.txt https://www1.ncdc.noaa.gov/pub/data/paleo/reconstructions/kobashi2017/kobashi2017volc.txt https://www1.ncdc.noaa.gov/pub/data/paleo/reconstructions/kobashi2017/kobashi2017greenland.txt https://www1.ncdc.noaa.gov/pub/data/paleo/reconstructions/kobashi2017/kobashi2017nh.txt https://www1.ncdc.noaa.gov/pub/data/paleo/reconstructions/kobashi2017/kobashi2017d15n.txt https://www1.ncdc.noaa.gov/pub/data/paleo/reconstructions/kobashi2017/kobashi2017volc.txt https://www1.ncdc.noaa.gov/pub/data/paleo/reconstructions/kobashi2017/kobashi2017greenland.txt English https://www.ncdc.noaa.gov/paleo/study/22057 https://www1.ncdc.noaa.gov/pub/data/paleo/reconstructions/kobashi2017/kobashi2017nh.txt https://www1.ncdc.noaa.gov/pub/data/paleo/reconstructions/kobashi2017/kobashi2017d15n.txt https://www1.ncdc.noaa.gov/pub/data/paleo/reconstructions/kobashi2017/kobashi2017volc.txt https://www1.ncdc.noaa.gov/pub/data/paleo/reconstructions/kobashi2017/kobashi2017greenland.txt Takuro Kobashi, Laurie Menviel, Aurich Jeltsch-Thömmes, Bo M. Vinther, Jason E. Box, Raimund Muscheler, Toshiyuki Nakaegawa, Patrik L. Pfister, Michael Döring, Markus Leuenberger, Heinz Wanner, Atsumu Ohmura2017Volcanic influence on centennial to millennial Holocene Greenland temperature changeScientific Reports1441710.1038/s41598-017-01451-7https://www.nature.com/articles/s41598-017-01451-7 START YEAR: 11933 cal yr BP * END YEAR: -50 cal yr BP -38.5 72.6 -38.5 72.6