Zhengyu, LIU; Shin, SI; Webb, RS; Lewis, W; Otto-Bliesner, BL
L02706.02701-L02706.02704
A coupled climate model study indicates the paleoclimate record of glacial thermohaline circulation (THC) and reversed deep-sea temperature-salinity (T-S) distribution in the Atlantic can be explained largely by lower glacial atmospheric CO[sup]2[/sup] alone. The reduced CO[sup]2[/sup] leads to increased Southern Ocean wintertime sea-ice cover and salinity, increased production of dense Antarctic Bottom Water (AABW), enhanced cold and saline AABW penetration into the deep North Atlantic, increased oceanic vertical stability, and reduced North Atlantic Deep Water (NADW) circulation. The dominant role of CO[sup]2[/sup] forcing during the glacial implies a positive feedback between the Southern Ocean regulated THC and the glacial global carbon cycle. (English)
Cycle carbone; Monde; Boucle réaction; Rétroaction; Stabilité; Pénétration; Glace marine; Plomb; Atlantique(Holocène); Salinité; Température; Paléoclimat; Etude sur modèle; Modèle climat; Climat; Convection thermohaline; Circulation thermohaline; Forçage; Eau profonde Océan Atlantique Nord; Océan Atlantique Nord; Eau fond Antarctique; Mers Antarctiques; Phanérozoïque; Cénozoïque; Quaternaire; Quaternaire sup; Holocène; Océan Atlantique; Océan Antarctique; carbon cycle; global; Feedback; stability; penetration; sea ice; lead; Atlantic; salinity; temperature; paleoclimate; Model study; Climate models; climate; Thermohaline convection; thermohaline circulation; Forcing; North Atlantic Deep Water; North Atlantic; Antarctic bottom water; Antarctic Seas; Phanerozoic; Cenozoic; Quaternary; upper Quaternary; Holocene; Atlantic Ocean; Antarctic Ocean; Mundo; Retroalimentación; Estabilidad; Hielo marino; Plomo; Salinidad; Temperatura; Paleoclima; Estudio sobre modelo; Clima; Convección termosalina; Circulación termohalina; Forzamiento; Océano Atlántico Norte; Mares antárticos; Fanerozoico; Cenozoico; Cuaternario; Cuaternario sup; Holoceno; Océano Atlántico