Other
Scientific paper
Feb 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3603603h&link_type=abstract
Geophysical Research Letters, Volume 36, Issue 3, CiteID L03603
Other
Oceanography: Physical: General Circulation (1218, 1222), Oceanography: Physical: Deep Recirculations, Oceanography: General: Numerical Modeling (0545, 0560)
Scientific paper
Geothermal heating of abyssal waters is rarely regarded as a significant driver of the large-scale oceanic circulation. Numerical experiments with the Ocean General Circulation Model POTSMOM-1.0 suggest, however, that the impact of geothermal heat flux on deep ocean circulation is not negligible. Geothermal heating contributes to an overall warming of bottom waters by about 0.4°C, decreasing the stability of the water column and enhancing the formation rates of North Atlantic Deep Water and Antarctic Bottom Water by 1.5 Sv (10%) and 3 Sv (33%), respectively. Increased influx of Antarctic Bottom Water leads to a radiocarbon enrichment of Pacific Ocean waters, increasing Δ14C values in the deep North Pacific from -269‰ when geothermal heating is ignored in the model, to -242‰ when geothermal heating is included. A stronger and deeper Atlantic meridional overturning cell causes warming of the North Atlantic deep western boundary current by up to 1.5°C.
Hofmann Martin
Morales Maqueda M. A.
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