DOI: 10.1002/2015GB005181
Scopus记录号: 2-s2.0-84947018725
论文题名: Global deep ocean oxygenation by enhanced ventilation in the Southern Ocean under long-term global warming
作者: Yamamoto A ; , Abe-Ouchi A ; , Shigemitsu M ; , Oka A ; , Takahashi K ; , Ohgaito R ; , Yamanaka Y
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2015
卷: 29, 期: 10 起始页码: 1801
结束页码: 1815
语种: 英语
英文关键词: dissolved oxygen
; long-term climate change
; ocean biogeochemical modeling
; open ocean deep convection
; Weddell Sea
Scopus关键词: biogeochemical cycle
; carbon dioxide
; dissolved oxygen
; global ocean
; global warming
; long-term change
; meridional circulation
; oceanic circulation
; oceanic convection
; open ocean
; organic matter
; oxygen minimum layer
; oxygenation
; remineralization
; ventilation
; Atlantic Ocean
; Southern Ocean
; Weddell Sea
英文摘要: Global warming is expected to decrease ocean oxygen concentrations by less solubility of surface ocean and change in ocean circulation. The associated expansion of the oxygen minimum zone would have adverse impacts on marine organisms and ocean biogeochemical cycles. Oxygen reduction is expected to persist for a thousand years or more, even after atmospheric carbon dioxide stops rising. However, long-term changes in ocean oxygen and circulation are still unclear. Here we simulate multimillennium changes in ocean circulation and oxygen under doubling and quadrupling of atmospheric carbon dioxide, using a fully coupled atmosphere-ocean general circulation model and an offline biogeochemical model. In the first 500 years, global oxygen concentration decreases, consistent with previous studies. Thereafter, however, the oxygen concentration in the deep ocean globally recovers and overshoots at the end of the simulations, despite surface oxygen decrease and weaker Atlantic meridional overturning circulation. This is because, after the initial cessation, the recovery and overshooting of deep ocean convection in the Weddell Sea enhance ventilation and supply oxygen-rich surface waters to deep ocean. Another contributor to deep ocean oxygenation is seawater warming, which reduces the export production and shifts the organic matter remineralization to the upper water column. Our results indicate that the change in ocean circulation in the Southern Ocean potentially drives millennial-scale oxygenation in deep ocean, which is opposite to the centennial-scale global oxygen reduction and general expectation. ©2015. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77913
Appears in Collections: 气候变化事实与影响
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作者单位: Atmospheric and Ocean Research Institute, University of Tokyo, Kashiwa, Japan; Graduate School of Environmental Science, Hokkaido University, Sapporo, Japan; Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan
Recommended Citation:
Yamamoto A,, Abe-Ouchi A,, Shigemitsu M,et al. Global deep ocean oxygenation by enhanced ventilation in the Southern Ocean under long-term global warming[J]. Global Biogeochemical Cycles,2015-01-01,29(10)