West Antarctic Ice Sheet Divide Borehole temperature reconstruction over the last 2000 years Orsi, A.J.; Cornuelle, B.D.; Severinghaus, J. Orsi, A.J. Cornuelle, B.D. Severinghaus, J. Air Temperature Reconstruction earth science/paleoclimate/climate reconstructions (surface temperature,null,unspecified margin of error,degree Celsius,annual,climate reconstructions,null,numerical simulation,N,inverse model) earth science/paleoclimate/borehole|climate reconstructions (surface temperature,null,one standard deviation,degree Celsius,annual,borehole|climate reconstructions,null,inverse model,N,null) earth science/paleoclimate/borehole|climate reconstructions (surface temperature,null,null,degree Celsius,annual,borehole|climate reconstructions,null,inverse model,N,null) earth science/paleoclimate/borehole (age,null,null,year Common Era,null,borehole,null,null,N,null) earth science/paleoclimate/climate reconstructions (surface temperature,null,null,degree Celsius,annual,climate reconstructions,null,numerical simulation,N,inverse model) earth science/paleoclimate/borehole|climate reconstructions (age,null,null,year Common Era,null,borehole|climate reconstructions,null,null,N,null) earth science/paleoclimate/boreholes (WAIS Divide>LATITUDE -79.463>LONGITUDE -112.125) The largest climate anomaly of the last 1000 years in the Northern Hemisphere was the Little Ice Age (LIA) from 1400–1850 C.E., but little is known about the signature of this event in the Southern Hemisphere, especially in Antarctica. We present temperature data from a 300 m borehole at the West Antarctic Ice Sheet (WAIS) Divide. Results show that WAIS Divide was colder than the last 1000-year average from 1300 to 1800 C.E. The temperature in the time period 1400–1800 C.E. was on average 0.52 ± 0.28°C colder than the last 100-year average. This amplitude is about half of that seen at Greenland Summit (GRIP). This result is consistent with the idea that the LIA was a global event, probably caused by a change in solar and volcanic forcing, and was not simply a seesaw-type redistribution of heat between the hemispheres as would be predicted by some ocean-circulation hypotheses. The difference in the magnitude of the LIA between Greenland and West Antarctica suggests that the feedbacks amplifying the radiative forcing may not operate in the same way in both regions. STUDY NOTES: The first 1000 years are not well constrained. See the paper for details. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Orsi, A.J. Investigator : Cornuelle, B.D. Investigator : Severinghaus, J. 2017-05-19 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/22591 https://www1.ncdc.noaa.gov/pub/data/paleo/pages2k/pages2k-temperature-v2-2017/data-version-2.0.0/Ant-WAIS-Divide.Severinghaus.2012.txt https://www1.ncdc.noaa.gov/pub/data/paleo/pages2k/pages2k-temperature-v2-2017/data-version-2.0.0/Ant-WAIS-Divide.Severinghaus.2012.lpd https://www1.ncdc.noaa.gov/pub/data/paleo/borehole/severinghaus2012/severinghaus2012-wais.txt https://www1.ncdc.noaa.gov/pub/data/paleo/pages2k/pages2k-temperature-v2-2017/data-version-2.0.0/Ant-WAIS-Divide.Severinghaus.2012.txt https://www1.ncdc.noaa.gov/pub/data/paleo/pages2k/pages2k-temperature-v2-2017/data-version-2.0.0/Ant-WAIS-Divide.Severinghaus.2012.lpd https://www1.ncdc.noaa.gov/pub/data/paleo/borehole/severinghaus2012/severinghaus2012-wais.txt English https://www.ncdc.noaa.gov/paleo/study/22591 https://www1.ncdc.noaa.gov/pub/data/paleo/pages2k/pages2k-temperature-v2-2017/data-version-2.0.0/Ant-WAIS-Divide.Severinghaus.2012.txt https://www1.ncdc.noaa.gov/pub/data/paleo/pages2k/pages2k-temperature-v2-2017/data-version-2.0.0/Ant-WAIS-Divide.Severinghaus.2012.lpd https://www1.ncdc.noaa.gov/pub/data/paleo/borehole/severinghaus2012/severinghaus2012-wais.txt Orsi, Anais J., Bruce D. Cornuelle, and Jeffrey P. Severinghaus2012Little Ice Age cold interval in West Antarctica: Evidence from borehole temperature at the West Antarctic Ice Sheet (WAIS) DivideGeophysical Research Letters399L0971010.1029/2012GL051260 START YEAR: 8 AD * END YEAR: 2007 AD -112.125 -79.463 -112.125 -79.463