Do submesoscale frontal processes ventilate the oxygen minimum zone off Peru?.

Thomsen, Sören , Kanzow, Torsten, Colas, F., Echevin, V., Krahmann, Gerd and Engel, Anja (2016) Do submesoscale frontal processes ventilate the oxygen minimum zone off Peru?. Open Access Geophysical Research Letters, 43 (15). S367-S386. DOI 10.1002/2016GL070548.

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Abstract

The Peruvian upwelling system encompasses the most intense and shallowest oxygen minimum zone (OMZ) in the ocean. This system shows pronounced submesoscale activity like filaments and fronts. We carried out glider-based observations off Peru during austral summer 2013 to investigate whether submesoscale frontal processes ventilate the Peruvian OMZ. We present observational evidence for the subduction of highly oxygenated surface water in a submesoscale cold filament. The subduction event ventilates the oxycline but does not reach OMZ core waters. In a regional submesoscale-permitting model we study the pathways of newly upwelled water. About 50% of upwelled virtual floats are subducted below the mixed layer within 5 days emphasizing a hitherto unrecognized importance of subduction for the ventilation of the Peruvian oxycline.

Document Type: Article
Keywords: oxygen minimum zone; submesoscale; subduction; Peru; upwelling; ventilation
Research affiliation: OceanRep > SFB 754
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BI Biological Oceanography
OceanRep > SFB 754 > B9
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-PO Physical Oceanography
AWI
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1002/2016GL070548
ISSN: 0094-8276
Expeditions/Models/Experiments:
Date Deposited: 23 Aug 2016 07:05
Last Modified: 01 Feb 2019 15:17
URI: http://oceanrep.geomar.de/id/eprint/33615

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