Deoxygenation in the oxygen minimum zone of the eastern tropical North Atlantic

Stramma, Lothar, Visbeck, Martin, Brandt, Peter, Tanhua, Toste and Wallace, Douglas W.R. (2009) Deoxygenation in the oxygen minimum zone of the eastern tropical North Atlantic Geophysical Research Letters, 36 . L20607. DOI 10.1029/2009GL039593.

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Abstract

Observations and model results both indicate increasing oxygen minimum zones (OMZ) in the tropical oceans. Here we report on record low dissolved oxygen minimum concentrations in the eastern tropical North Atlantic in fall of 2008, with less than 40 mu mol kg(-1) in the core of the OMZ. There we find a deoxygenation rate of similar to 0.5 mu mol kg(-1) a(-1) during the last decades on two repeat sections at 7.5 and 11 degrees N. The potential temperature and salinity in the surface and central water layers increased on both sections compared to previous observations. However, in contrast to the oxygen decrease in the core of the OMZ, increasing oxygen concentrations were observed in the central water layer above the OMZ. The observed deoxygenation was thus restricted to the core of the oxygen minimum layer. It remains unclear whether the vertical expansion of the oxygen minimum represents a long time trend or decadal variations

Document Type: Article
Keywords: oxygen minimum zone, Cape Verde, deoxygenation, Merian-cruise
Research affiliation: OceanRep > SFB 754 > A5
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
OceanRep > SFB 754 > A4
OceanRep > SFB 754 > A3
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-PO Physical Oceanography
OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > SFB 754
Refereed: Yes
DOI etc.: 10.1029/2009GL039593
ISSN: 0094-8276
Projects: SFB754, Future Ocean
Expeditions/Models:
Date Deposited: 26 Oct 2009 13:35
Last Modified: 12 Oct 2017 12:14
URI: http://eprints.uni-kiel.de/id/eprint/4911

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