WAIS Divide Ice Core 67.2-9.8 kaBP Continuous CH4 Data Rhodes, R.H.; Brook, E.J.; Chiang, J.C.H.; Blunier, T.; Maselli, O.J.; McConnell, J.R.; Romanini, D.; Severinghaus, J. Rhodes, R.H. Brook, E.J. Chiang, J.C.H. Blunier, T. Maselli, O.J. McConnell, J.R. Romanini, D. Severinghaus, J. earth science/paleoclimate/ice cores (depth,null,null,meter,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (age,null,null,calendar kiloyear before present,null,ice cores,null,null,N,null) earth science/paleoclimate/climate forcing|ice cores (methane,bulk atmosphere,null,parts per billion,null,climate forcing|ice cores,smoothed,null,N,reported on the NOAA2004 scale) earth science/paleoclimate/ice cores (age,null,null,calendar year before present,null,ice cores,null,null,N,null) earth science/paleoclimate/ice core (WAIS Divide WDC06A>LATITUDE -79.4676>LONGITUDE -112.0865) The causal mechanisms responsible for the abrupt climate changes of the Last Glacial Period remain unclear. One major difficulty is dating ice-rafted debris deposits associated with Heinrich events: Extensive iceberg influxes into the North Atlantic Ocean linked to global impacts on climate and biogeochemistry. In a new ice core record of atmospheric methane with ultrahigh temporal resolution, we find abrupt methane increases within Heinrich stadials 1, 2, 4, and 5 that, uniquely, have no counterparts in Greenland temperature proxies. Using a heuristic model of tropical rainfall distribution, we propose that Hudson Strait Heinrich events caused rainfall intensification over Southern Hemisphere land areas, thereby producing excess methane in tropical wetlands. Our findings suggest that the climatic impacts of Heinrich events persisted for 740 to 1520 years. STUDY NOTES: Ultra-high temporal resolution methane concentration data from West Antarctic Ice Sheet (WAIS) Divide (WD) ice core obtained by online, continuous technique. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Rhodes, R.H. Investigator : Brook, E.J. Investigator : Chiang, J.C.H. Investigator : Blunier, T. Investigator : Maselli, O.J. Investigator : McConnell, J.R. Investigator : Romanini, D. Investigator : Severinghaus, J. 2015-05-29 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/18695 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/wais2015ch4.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/wais2015ch4.txt English https://www.ncdc.noaa.gov/paleo/study/18695 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/wais2015ch4.txt Rachael H. Rhodes, Edward J. Brook, John C.H. Chiang, Thomas Blunier, Olivia J. Maselli, Joseph R. McConnell, Daniele Romanini, Jeffrey P. Severinghaus2015Enhanced tropical methane production in response to iceberg discharge in the North AtlanticScience34862381016-101910.1126/science.1262005http://www.sciencemag.org/content/348/6238/1016.abstract START YEAR: 67200 cal yr BP * END YEAR: 9800 cal yr BP -112.0865 -79.4676 -112.0865 -79.4676