Proxy benchmarks for intercomparison of 8.2 ka simulations Morrill, C.; Anderson, D.M.; Bauer, B.A.; Buckner, R.; Gille, E.P.; Gross, W.S.; Hartman, M.; Shah, A. Morrill, C. Anderson, D.M. Bauer, B.A. Buckner, R. Gille, E.P. Gross, W.S. Hartman, M. Shah, A. Air Temperature Reconstruction Precipitation Reconstruction abrupt climate change earth science/paleoclimate/reconstructions (Global>LATITUDE >LONGITUDE ) The Paleoclimate Modelling Intercomparison Project (PMIP3) now includes the 8.2 ka event as a test of model sensitivity to North Atlantic freshwater forcing. To provide benchmarks for intercomparison, we compiled and analyzed high-resolution records spanning this event. Two previously-described anomaly patterns that emerge are cooling around the North Atlantic and drier conditions in the Northern Hemisphere tropics. Newer to this compilation are more robustly-defined wetter conditions in the Southern Hemisphere tropics and regionally-limited warming in the Southern Hemisphere. Most anomalies around the globe lasted on the order of 100 to 150 yr. More quantitative reconstructions are now available and indicate cooling of ~1C and a ~20% decrease in precipitation in parts of Europe as well as spatial gradients in d18O from the high to low latitudes. Unresolved questions remain about the seasonality of the climate response to freshwater forcing and the extent to which the bipolar seesaw operated in the early Holocene. STUDY NOTES: This compilation of proxy records includes quality-controlled values from cores spanning part or all of the period between 7,400 and 9,000 calendar years before present, provided on a common age scale (calendar years before present, where present = 1950 A.D.). The main data file is in comma-separated values format and first gives metadata information for each of the cores (i.e., site name, variable measured, latitude, longitude, journal citation). Below the metadata, data for all time series are presented in three columns. The first column is a Time series Index, which identifies the time series according to the metadata table; the second column is age in calendar years BP; and the third column is the proxy timeseries values. Since this data set only spans a period near 8,200 calendar years before present, these are often subsets of a core's full data. All data from a core as well as chronology to FTP files are listed below in the "File URL" column. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Morrill, C. Investigator : Anderson, D.M. Investigator : Bauer, B.A. Investigator : Buckner, R. Investigator : Gille, E.P. Investigator : Gross, W.S. Investigator : Hartman, M. Investigator : Shah, A. 2013-04-08 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/14192 https://www1.ncdc.noaa.gov/pub/data/paleo/8.2ka/8.2ka-data.csv https://www1.ncdc.noaa.gov/pub/data/paleo/8.2ka/8.2ka-data.csv English https://www.ncdc.noaa.gov/paleo/study/14192 https://www1.ncdc.noaa.gov/pub/data/paleo/8.2ka/8.2ka-data.csv Morrill, C., D.M. Anderson, B.A. Bauer, R. Buckner, E.P. Gille, W.S. Gross, M. Hartman, and A. Shah. 2013. Proxy benchmarks for intercomparison of 8.2 ka simulations. Climate of the Past, Vol. 9, pp. 423-432. doi:10.5194/cp-9-423-2013 START YEAR: 8400 cal yr BP * END YEAR: 8000 cal yr BP -180 -90 180 90