期刊
ANNUAL REVIEW OF MARINE SCIENCE
卷 14, 期 -, 页码 355-378出版社
ANNUAL REVIEWS
DOI: 10.1146/annurev-marine-041921-090849
关键词
respiration; deoxygenation; eastern boundary upwelling systems; carbon export
资金
- Helmholtz Association, Germany's Collaborative Research Center 754 [SFB 754]
- German Federal Ministry of Education and Research (BMBF)
- European Union project TRIATLAS (European Union Horizon 2020 program) [817578]
- Make Our Planet Great Again grant from the French National Research Agency (ANR) within the Programme d'Investissements d'Avenir [ANR-19-MPGA-0012]
This article explores the role of organic matter in oxygen minimum zones and its interdependencies with oxygen cycling. By studying two different OMZs with varying degrees of hypoxia, it helps us better understand the cycling process of organic matter, identify knowledge gaps in current research, and determine future research priorities.
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 othenvise 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.
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