Organic Matter Supply and Utilization in Oxygen Minimum Zones.

Engel, Anja , Kiko, Rainer and Dengler, Marcus (In Press / Accepted) Organic Matter Supply and Utilization in Oxygen Minimum Zones. Annual Review of Marine Science, 14 (1). DOI 10.1146/annurev-marine-041921-090849.

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Abstract

Organic matter (OM) plays a significant role in the formation of oxygen minimum zones (OMZs) and associated biogeochemical cycling. OM supply processes to the OMZ include physical transport, particle formation, and sinking as well as active transport by migrating zooplankton and nekton. In addition to the availability of oxygen and other electron acceptors, the remineralization rate of OM is controlled by its biochemical quality. Enhanced microbial respiration of OM can induce anoxic microzones in an otherwise oxygenated water column. Reduced OM degradation under low-oxygen conditions, on the other hand, may increase the CO2 storage time in the ocean. Understanding the interdependencies between OM and oxygen cycling is of high relevance for an ocean facing deoxygenation as a consequence of global warming. In this review, we describe OM fluxes into and cycling within two large OMZs associated with eastern boundary upwelling systems that differ greatly in the extent of oxygen loss: the highly oxygen-depleted OMZ in the tropical South Pacific and the moderately hypoxic OMZ in the tropical North Atlantic. We summarize new findings from a large German collaborative research project, Collaborative Research Center 754 (SFB 754), and identify knowledge gaps and future research priorities.

Document Type: Article
Funder compliance: info:eu-repo/grantAgreement/EC/H2020/817578
Keywords: respiration, deoxygenation, eastern boundary upwelling systems, carbon export
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-PO Physical Oceanography
OceanRep > SFB 754
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BI Biological Oceanography
Main POF Topic: PT6: Marine Life
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1146/annurev-marine-041921-090849
ISSN: 1941-1405
Projects: SFB754, REEBUS, CUSCO, TRIATLAS
Date Deposited: 15 Oct 2021 07:26
Last Modified: 15 Oct 2021 07:26
URI: http://oceanrep.geomar.de/id/eprint/54232

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