期刊
GEOPHYSICAL RESEARCH LETTERS
卷 44, 期 21, 页码 11106-11114出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2017GL075157
关键词
oxygen minimum zones; remineralization depth; the Arabian Sea; the Bay of Bengal; denitrification; biogeochemical cycles
资金
- Center for Prototype Climate Modeling (CPCM)
- New York University Abu Dhabi (NYUAD) Research Institute
The combination of high primary productivity and weak ventilation in the Arabian Sea (AS) and Bay of Bengal (BoB) generates vast areas of depleted oxygen, known as oxygen minimum zones (OMZs). The AS OMZ is the world's thickest and hosts up to 40% of global denitrification. In contrast, the OMZ in the BoB is weaker and denitrification free. Using a series of model simulations, we show that the deeper remineralization depth (RD) in the BoB, potentially associated with organic matter aggregation with riverine mineral particles, contributes to weaken its OMZ. When the RD is set uniformly across both seas, the model fails to reproduce the observed contrast between the two OMZs, irrespective of the chosen RD. In contrast, when the RD is allowed to vary spatially, the contrasting distributions of oxygen and nitrate are correctly reproduced, and water column denitrification is simulated exclusively in the AS, in agreement with observations.
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