气候变化领域集成服务门户(CCPortal): Projected Centennial Oxygen Trends and Their Attribution to Distinct Ocean Climate Forcings

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DOI	10.1029/2018GB005939
	Projected Centennial Oxygen Trends and Their Attribution to Distinct Ocean Climate Forcings
	Takano Y.; Ito T.; Deutsch C.
发表日期	2018
ISSN	0886-6236
EISSN	1944-9224
起始页码	1329
结束页码	1349
卷号	32 期号:9
英文摘要	We explore centennial changes in tropical Pacific oxygen (O2) using numerical models to illustrate the dominant patterns and mechanisms under centennial climate change. Future projections from state-of-the-art Earth System Models exhibit significant model to model differences, but decreased solubility and weakened ventilation together deplete thermocline O2 in middle to high latitudes. In contrast, the tropical thermocline O2 undergoes much smaller changes or even a slight increase. A suite of sensitivity experiments using a coarse resolution ocean circulation and biogeochemistry model show that ocean warming is the leading cause of global deoxygenation in the thermocline across all latitudes with secondary contributions from changes in hydrological cycles and wind stress modulating regional changes in O2. The small O2 changes in the tropical Pacific thermocline reflect near-complete compensation between the solubility decrease due to warming and reduction in apparent oxygen utilization (AOU). We further quantified the changes in AOU due to contributions from changes in water mass age and biological remineralization from the sensitivity experiments. The two effects almost equally contribute to the reduction of AOU in the tropical Pacific thermocline (43% for physical circulations and 57% for biology). Our results suggest that better understanding of water mass changes in the tropical oceans is key to improving projections and reducing the uncertainties of future O2 changes. ©2018. American Geophysical Union. All Rights Reserved.
英文关键词	centennial timescale; climate change; oxygen trends
语种	英语
scopus关键词	biogeochemistry; climate change; climate forcing; climate prediction; deep water ventilation; oxygen; remineralization; thermocline; trend analysis; tropical region; water mass; Pacific Ocean; Pacific Ocean (Tropical)
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/129796
作者单位	School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, United States; Max-Planck Institute for Meteorology, Hamburg, Germany; School of Oceanography, University of Washington, Seattle, WA, United States
推荐引用方式 GB/T 7714	Takano Y.,Ito T.,Deutsch C.. Projected Centennial Oxygen Trends and Their Attribution to Distinct Ocean Climate Forcings[J],2018,32(9).
APA	Takano Y.,Ito T.,&Deutsch C..(2018).Projected Centennial Oxygen Trends and Their Attribution to Distinct Ocean Climate Forcings.Global Biogeochemical Cycles,32(9).
MLA	Takano Y.,et al."Projected Centennial Oxygen Trends and Their Attribution to Distinct Ocean Climate Forcings".Global Biogeochemical Cycles 32.9(2018).