DOI: 10.1002/2017GB005777
论文题名: The Sensitivity of Future Ocean Oxygen to Changes in Ocean Circulation
作者: Palter J.B. ; Trossman D.S.
刊名: Global Biogeochemical Cycles
ISSN: 0886-6236
EISSN: 1944-9224
出版年: 2018
卷: 32, 期: 5 语种: 英语
英文关键词: biological pump
; carbon dioxide
; carbon dioxide enrichment
; climate change
; future prospect
; global ocean
; global warming
; meridional circulation
; oceanic circulation
; sensitivity analysis
; twentieth century
; Atlantic Ocean
; Southern Ocean
学科: AMOC
; biological pump
; circulation
; ocean deoxygenation
中文摘要: A decline in global ocean oxygen concentrations has been observed over the twentieth century and is predicted to continue under future climate change. We use a unique modeling framework to understand how the perturbed ocean circulation may influence the rate of ocean deoxygenation in response to a doubling of atmospheric CO2 and associated global warming. These simulations suggest that much of the oxygen decline under warming is due to changes in ocean mixing and O2 solubility. However, in our model, the large-scale ocean circulation response to CO2 doubling slows the pace of future oxygen loss by 20%. Oxygen concentration changes are most sensitive to circulation perturbations in the Southern Ocean. A small stabilizing effect on oxygen arises from the reduction of export productivity and associated respiration in the ocean interior. A slowdown of the Atlantic Meridional Overturning Circulation increases the residence time of the deep Atlantic Ocean but does not cause a major oxygen decline at the time of CO2 doubling, because respiration is slow at these depths. The simulations show that the decrease in O2 solubility associated with ocean warming is greater than the realized decrease in preformed O2, particularly at high latitudes, where circulation changes reduce the proportion of undersaturated waters sinking into the ocean interior. Finally, in the tropical Pacific oxygen minimum zone, a predicted weakening of the Walker Circulation slows the regional upwelling of nutrients and the associated export productivity and respiration, preventing the intensification of hypoxia there. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160236
Appears in Collections: 气候变化与战略
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作者单位: Graduate School of Oceanography, University of Rhode Island, Narragansett, RI, United States; Goddard Earth Sciences Technology and Research, Greenbelt, MD, United States; Department of Earth and Planetary Sciences, The Johns Hopkins University, Baltimore, MD, United States
Recommended Citation:
Palter J.B.,Trossman D.S.. The Sensitivity of Future Ocean Oxygen to Changes in Ocean Circulation[J]. Global Biogeochemical Cycles,2018-01-01,32(5)