Oxygen minimum zone variations in the tropical Pacific during the Holocene

Xu, Xu, Segschneider, Joachim, Schneider, Birgit, Park, Wonsun and Latif, Mojib (2015) Oxygen minimum zone variations in the tropical Pacific during the Holocene Geophysical Research Letters, 42 (20). pp. 8530-8537. DOI 10.1002/2015GL064680.

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We performed simulations with a global model of ocean biogeochemistry forced with orbitally driven anomalies of oceanic conditions for the mid-Holocene, known as Holocene climate optimum, to investigate natural variability in the eastern equatorial Pacific oxygen minimum zone (EEP OMZ). While the global mean temperature during the mid-Holocene was likely slightly higher than the 1961–1990 mean, the sea surface temperature in the EEP was slightly lower. Mid-Holocene oxygen concentrations in the EEP OMZ are generally increased, locally by up to 50%, and the EEP OMZ volume was, depending on definition of the OMZ threshold, at least 6% lower. These higher oxygen levels are the combined result of competing physical and biogeochemical processes. Our results imply that mechanisms for past changes in the EEP OMZ intensity and extension can differ from the global warming driven decline in oxygen levels observed for the recent decades and predicted for the future.

Document Type: Article
Additional Information: WOS:000364782500034
Keywords: paleoceanography; numerical modeling; oxygen
Research affiliation: Kiel University > Kiel Marine Science
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-ME Maritime Meteorology
OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > SFB 754
OceanRep > SFB 754 > A1
Kiel University
Refereed: Yes
DOI etc.: 10.1002/2015GL064680
ISSN: 0094-8276
Projects: SFB754, PISCES, Future Ocean
Date Deposited: 29 Oct 2015 10:14
Last Modified: 03 Apr 2018 09:31
URI: http://eprints.uni-kiel.de/id/eprint/30112

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