Other
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.2923o&link_type=abstract
Geophysical Research Letters, Volume 28, Issue 15, p. 2923-2926
Other
26
Oceanography: General: Arctic And Antarctic Oceanography, Oceanography: General: Descriptive And Regional Oceanography, Oceanography: General: Physical And Chemical Properties Of Seawater, Oceanography: General: Water Masses
Scientific paper
The abyssal ocean is filled with cold, dense waters that sink along the Antarctic continental slope and overflow sills that lie south of the Nordic Seas. Recent integrations of chlorofluorocarbon-11 (CFC) measurements are similar in Antarctic Bottom Water (AABW) and in lower North Atlantic Deep Water (NADW), but Antarctic inputs are ~2°C colder than their northern counterparts. This indicates comparable ventilation rates from both polar regions, and accounts for the Southern Ocean dominance over abyssal cooling. The decadal CFC-based estimates of recent ventilation are consistent with other hydrographic observations and with longer-term radiocarbon data, but not with hypotheses of a 20th-century slowdown in the rate of AABW formation. Significant variability is not precluded by the available ocean measurements, however, and interannual to decadal changes are increasingly evident at high latitudes.
Gordon Arnold L.
Jacobs Stanley S.
Orsi Alejandro H.
Visbeck Martin
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