{"refrec":{"BRefID":331933,"RR":"<b>Ai, X.E.; Studer, A.S.; Sigman, D.M.; Martínez-Garcia, A.; Fripiat, F.; Thöle, L.M.; Michel, E.; Gottschalk, J.; Arnold, L.; Moretti, S.; Schmitt, M.; Oleynik, S.; Jaccard, S.L.; Haug, G.H.</b> (2020). Southern Ocean upwelling, Earth’s obliquity, and glacial-interglacial atmospheric CO<sub>2</sub> change. <i>Science (Wash.) 370(6522)</i>: 1348-1352. <a href=\"https://dx.doi.org/10.1126/science.abd2115\" target=\"_blank\">https://dx.doi.org/10.1126/science.abd2115</a>","BEntID":325545,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Science (Wash.) 370(6522)</i>: 1348-1352. <a href=\"https://dx.doi.org/10.1126/science.abd2115\" target=\"_blank\">https://dx.doi.org/10.1126/science.abd2115</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Ai, X.E.; Studer, A.S.; Sigman, D.M.; Martínez-Garcia, A.; Fripiat, F.; Thöle, L.M.; Michel, E.; Gottschalk, J.; Arnold, L.; Moretti, S.; Schmitt, M.; Oleynik, S.; Jaccard, S.L.; Haug, G.H.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Ai, X.E. <i>et al.</i>","Englishabstract":"Previous studies have suggested that during the late Pleistocene ice ages, surface-deep exchange was somehow weakened in the Southern Ocean’s Antarctic Zone, which reduced the leakage of deeply sequestered carbon dioxide and thus contributed to the lower atmospheric carbon dioxide levels of the ice ages. Here, high-resolution diatom-bound nitrogen isotope measurements from the Indian sector of the Antarctic Zone reveal three modes of change in Southern Westerly Wind–driven upwelling, each affecting atmospheric carbon dioxide. Two modes, related to global climate and the bipolar seesaw, have been proposed previously. The third mode—which arises from the meridional temperature gradient as affected by Earth’s obliquity (axial tilt)—can explain the lag of atmospheric carbon dioxide behind climate during glacial inception and deglaciation. 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