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. Menviel, L. Heinrich Events earth science/paleoclimate/model (Global>LATITUDE >LONGITUDE ) 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 NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Menviel, L. 2018-08-12 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/24870 http://dx.doi.org/10.4225/41/58192cb8bff06 https://www1.ncdc.noaa.gov/pub/data/paleo/gcmoutput/menviel2018/ https://www1.ncdc.noaa.gov/pub/data/paleo/gcmoutput/menviel2018/menviel2018-hs1.txt http://dx.doi.org/10.4225/41/58192cb8bff06 https://www1.ncdc.noaa.gov/pub/data/paleo/gcmoutput/menviel2018/ https://www1.ncdc.noaa.gov/pub/data/paleo/gcmoutput/menviel2018/menviel2018-hs1.txt English https://www.ncdc.noaa.gov/paleo/study/24870 http://dx.doi.org/10.4225/41/58192cb8bff06 https://www1.ncdc.noaa.gov/pub/data/paleo/gcmoutput/menviel2018/ https://www1.ncdc.noaa.gov/pub/data/paleo/gcmoutput/menviel2018/menviel2018-hs1.txt Menviel, Laurie2018Transient simulations of Heinrich stadial 1 with a carbon-isotope enabled model and impact of poleward intensified southern hemisphere westerlies in a global eddy permitting ocean, sea-ice, carbon cycle model v1.0National Research Data Collection10.4225/41/5af39aae7960f Menviel, L., P. Spence, J. Yu, M. Chamberlain, R. Matear, K.J. Meissner, and M.H. England2018Southern Hemisphere westerlies as a driver of the early deglacial atmospheric CO2 riseNature Communications10.1038/s41467-018-04876-4https://www.nature.com/articles/s41467-018-04876-4.epdf START YEAR: 18000 cal yr BP * END YEAR: 15000 cal yr BP -180 -90 180 90