Middepth circulation of the eastern tropical South Pacific and its link to the oxygen minimum zone.

Czeschel, Rena, Stramma, Lothar , Schwarzkopf, Franziska U. , Giese, B. S., Funk, Andreas and Karstensen, Johannes (2011) Middepth circulation of the eastern tropical South Pacific and its link to the oxygen minimum zone. Open Access Journal of Geophysical Research: Oceans, 116 . C01015. DOI 10.1029/2010JC006565.

[img]
Preview
Text
2010JC006565-pip.pdf - Accepted Version

Download (1194Kb)
[img] Text
Czeschel.pdf - Published Version
Restricted to Registered users only

Download (1132Kb) | Contact

Supplementary data:

Abstract

There is an incomplete description of the mid-depth circulation and its link to the oxygen minimum zone (OMZ) in the eastern tropical South Pacific. Subsurface currents of the OMZ in the eastern tropical South Pacific are investigated with a focus at 400 m depth, close to the core of the OMZ, using several Acoustic Doppler Current Profiler sections recorded in January and February 2009. Five profiling floats with oxygen sensors were deployed along 85°50’W in February 2009 with a drift depth at 400 m. Their spreading paths are compared with the model flow field from a 1/10° Tropical Pacific model (TROPAC01) and the Simple Ocean Data Assimilation (SODA) model. Overall the
mean currents in the eastern tropical South Pacific are weak so that eddy variability influences the flow and ultimately feed oxygen-poor water to the OMZ. The center of
the OMZ is a stagnant area so that floats stay much longer in this region and can even reverse direction. In one case of one float deployed at 8°S returned to the same location
after 15 month. On the northern side of the OMZ in the equatorial current system, floats move rapidly to the west. Most current bands reported for the near surface layer exist
also in the depth range of the OMZ. A schematic circulation flow field for the OMZ core depth is derived which shows the northern part of the South Pacific subtropical gyre
south of the OMZ and the complicated zonal equatorial flow field north of the OMZ.

Document Type: Article
Keywords: ocean circulation, oxygen minimum zone, profiling floats, tropical Pacific Ocean, SODA model, TROPAC01; general circulation; equatorial oceanography; eastern boundary currents; eddies and mesoscale processes
Research affiliation: OceanRep > SFB 754 > A5
OceanRep > SFB 754 > A2
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-TM Theory and Modeling
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-PO Physical Oceanography
OceanRep > SFB 754
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1029/2010JC006565
ISSN: 2169-9275
Projects: SFB754, Future Ocean
Expeditions/Models/Experiments:
Date Deposited: 16 Dec 2010 06:39
Last Modified: 27 Feb 2018 09:52
URI: http://oceanrep.geomar.de/id/eprint/10531

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...