气候变化领域集成服务门户(CCPortal): The Sensitivity of Future Ocean Oxygen to Changes in Ocean Circulation

CCPortal

DOI	10.1002/2017GB005777
	The Sensitivity of Future Ocean Oxygen to Changes in Ocean Circulation
	Palter J.B.; Trossman D.S.
发表日期	2018
ISSN	0886-6236
EISSN	1944-9224
起始页码	738
结束页码	751
卷号	32 期号:5
英文摘要	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.
英文关键词	AMOC; biological pump; circulation; ocean deoxygenation
语种	英语
scopus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
来源期刊	Global Biogeochemical Cycles
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129832
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
推荐引用方式 GB/T 7714	Palter J.B.,Trossman D.S.. The Sensitivity of Future Ocean Oxygen to Changes in Ocean Circulation[J],2018,32(5).
APA	Palter J.B.,&Trossman D.S..(2018).The Sensitivity of Future Ocean Oxygen to Changes in Ocean Circulation.Global Biogeochemical Cycles,32(5).
MLA	Palter J.B.,et al."The Sensitivity of Future Ocean Oxygen to Changes in Ocean Circulation".Global Biogeochemical Cycles 32.5(2018).