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. Open Access 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: OceanRep > SFB 754
OceanRep > SFB 754 > A1
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-ME Maritime Meteorology
Kiel University
Kiel University > Kiel Marine Science
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
Open Access Journal?: No
Publisher: AGU (American Geophysical Union), Wiley
Projects: SFB754, PISCES, Future Ocean, KCM
Date Deposited: 29 Oct 2015 10:14
Last Modified: 24 Sep 2019 00:05
URI: https://oceanrep.geomar.de/id/eprint/30112

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