Oxygen minimum zone expansion in the eastern tropical North Pacific during deglaciation

Details Oxygen minimum zone expansion in the eastern tropical North Pacific during deglaciation Oxygen minimum zone expansion in the eastern tropical North Pacific during deglaciation

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3320602h&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 20, CiteID L20602

Mathematics

Logic

15

Oceanography: Biological And Chemical: Anoxic Environments (0404, 1803, 4834, 4902), Paleoceanography: Abrupt/Rapid Climate Change (1605), Paleoceanography: Biogeochemical Cycles, Processes, And Modeling (0412, 0414, 0793, 1615, 4805), Paleoceanography: Upwelling (4279)

Scientific paper

During deglaciation at ~17 ka the intensity and footprint of the oxygen minimum zone (OMZ) increased in the Eastern Tropical North Pacific (ETNP) before a subsequent expansion on the California Margin. Evidence for the earlier increase is found in trace metal concentrations, lamination preservation and δ15N values from cores located between 540-750 m water depth in the Gulf of Tehuantepec, Southern Mexico. These results differ from similar proxies found even 5°N of the site, where there is evidence for OMZ changes related to rapid climate change in the Northern Hemisphere. Instead, OMZ expansion in the Gulf was contemporaneous with changes in sea ice extent and zonal wind shifts around Antarctica, pointing to Subantarctic Mode Water and Antarctic Intermediate Water as likely sources of oxygen-depleted water. These observations reinforce the importance of the Southern Ocean as a primary modulator of northern hemisphere ocean climate, as far as 15°N in the ETNP.

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