DOI: 10.1029/2018GB005939
论文题名: Projected Centennial Oxygen Trends and Their Attribution to Distinct Ocean Climate Forcings
作者: Takano Y. ; Ito T. ; Deutsch C.
刊名: Global Biogeochemical Cycles
ISSN: 0886-6236
EISSN: 1944-9224
出版年: 2018
卷: 32, 期: 9 语种: 英语
英文关键词: biogeochemistry
; climate change
; climate forcing
; climate prediction
; deep water ventilation
; oxygen
; remineralization
; thermocline
; trend analysis
; tropical region
; water mass
; Pacific Ocean
; Pacific Ocean (Tropical)
学科: centennial timescale
; climate change
; oxygen trends
中文摘要: 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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160200
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
Takano Y.,Ito T.,Deutsch C.. Projected Centennial Oxygen Trends and Their Attribution to Distinct Ocean Climate Forcings[J]. Global Biogeochemical Cycles,2018-01-01,32(9)