Physics
Scientific paper
Sep 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.2749d&link_type=abstract
Geophysical Research Letters, Volume 26, Issue 17, p. 2749-2752
Physics
38
Global Change: Climate Dynamics, Global Change: Oceans, Global Change: Water Cycles, Hydrology: Anthropogenic Effects
Scientific paper
The mechanism by which the model-simulated North Atlantic thermohaline circulation (THC) weakens in response to increasing greenhouse gas (GHG) forcing is investigated through the use of a set of five multi-century experiments. Using a coarse resolution version of the GFDL coupled climate model, the role of various surface fluxes in weakening the THC is assessed. Changes in net surface freshwater fluxes (precipitation, evaporation, and runoff from land) are found to be the dominant cause for the model's THC weakening. Surface heat flux changes brought about by rising GHG levels also contribute to THC weakening, but are of secondary importance. Wind stress variations have negligible impact on the THC's strength in the transient GHG experiment.
Delworth Thomas L.
Dixon Keith W.
Spelman Michael J.
Stouffer Ronald J.
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