Atmospheric CO2 forcing on glacial thermohaline circulation and climate

Details Atmospheric CO2 forcing on glacial thermohaline circulation and climate Atmospheric CO2 forcing on glacial thermohaline circulation and climate

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3202706l&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 2, CiteID L02706

Physics

6

Global Change: Climate Dynamics (0429, 3309), Paleoceanography: Abrupt/Rapid Climate Change (1605), Paleoceanography: Global Climate Models (1626, 3337), Paleoceanography: Thermohaline

Scientific paper

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 CO2 alone. The reduced CO2 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 CO2 forcing during the glacial implies a positive feedback between the Southern Ocean regulated THC and the glacial global carbon cycle.

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