noaa-model-24870 Transient simulations of Heinrich stadial 1 with a carbon-isotope enabled model and impact of poleward intensified southern hemisphere westerlies, carbon cycle model v1.0 Menviel, L. Transient simulations of Heinrich stadial 1 with a carbon-isotope enabled model and impact of poleward intensified southern hemisphere westerlies, carbon cycle model v1.0 2018-08-12 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/24870 Investigator L. Menviel earth science paleoclimate model ocean model geoscientificInformation Heinrich Events 18000 cal yr BP 15000 cal yr BP Complete -90 90 -180 180 Geographic Region Global Global>LATITUDE >LONGITUDE None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Menviel, Laurie 2018 National Research Data Collection 10.4225/41/5af39aae7960f Menviel, L., P. Spence, J. Yu, M. Chamberlain, R. Matear, K.J. Meissner, and M.H. England 2018 Nature Communications 10.1038/s41467-018-04876-4 https://www.nature.com/articles/s41467-018-04876-4.epdf

The early part of the last deglaciation is characterised by a ~40 ppm atmospheric CO2 rise ocurring in two abrupt phases. The underlying mechanisms driving these increases remain asubject of intense debate. Here, we successfully reproduce changes in CO2, d13C and ?14C as recorded by paleo-records during Heinrich stadial 1 (HS1). We show that HS1 CO2in reasecan be explained by enhanced Southern Ocean upwelling of carbon-rich Pacific deep andintermediate waters, resulting from intensified Southern Ocean convection and SouthernHemisphere (SH) westerlies. While enhanced Antarctic Bottom Water formation leads to a millennial CO2 outgassing, intensified SH westerlies induce a multi-decadal atmospheric CO2 rise. A strengthening of SH westerlies in a global eddy-permitting ocean model furthersupports a multi-decadal CO2 outgassing from the Southern Ocean. Our results highlight thecrucial role of SH westerlies in the global climate and carbon cycle system with importantimplica ions for future climate projections. STUDY NOTES: Data can also be found at this THREDDS Data Server: http://dap.nci.org.au/thredds/remoteCatalogService?catalog=http://dapds00.nci.org.au/thredds/catalogs/ua8/T1c13/T1c13.xml Provided Keywords: Carbon isotopes, Heinrich 1, Palaeoclimatology , Physical Oceanography

GET DATA http://dx.doi.org/10.4225/41/58192cb8bff06 DOI Landing Page; Landing Page of Original Source Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/gcmoutput/menviel2018/ Data Folder; LOVECLIM HS1 Data Directory with ASCII and netCDF subdirectories GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/gcmoutput/menviel2018/menviel2018-hs1.txt NOAA Template File; LOVECLIM HS1 Study Metadata USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11