DOI: 10.1002/2017GB005630
Scopus记录号: 2-s2.0-85019657509
论文题名: Impacts of ENSO on air-sea oxygen exchange: Observations and mechanisms
作者: Eddebbar Y ; A ; , Long M ; C ; , Resplandy L ; , Rödenbeck C ; , Rodgers K ; B ; , Manizza M ; , Keeling R ; F
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2017
卷: 31, 期: 5 起始页码: 901
结束页码: 921
语种: 英语
英文关键词: air-sea O2 flux
; climate variability
; El Niño–Southern Oscillation (ENSO)
; ocean biogeochemical dynamics
; ocean deoxygenation
; oxygen cycle
Scopus关键词: air-sea interaction
; anomaly
; atmospheric modeling
; atmospheric transport
; biogeochemical cycle
; climate variation
; El Nino-Southern Oscillation
; gas exchange
; hindcasting
; upwelling
; Pacific Ocean
; Pacific Ocean (Tropical)
英文摘要: Models and observations of atmospheric potential oxygen (APO ≃ O2 + 1.1 * CO2) are used to investigate the influence of El Niño–Southern Oscillation (ENSO) on air-sea O2 exchange. An atmospheric transport inversion of APO data from the Scripps flask network shows significant interannual variability in tropical APO fluxes that is positively correlated with the Niño3.4 index, indicating anomalous ocean outgassing of APO during El Niño. Hindcast simulations of the Community Earth System Model (CESM) and the Institut Pierre-Simon Laplace model show similar APO sensitivity to ENSO, differing from the Geophysical Fluid Dynamics Laboratory model, which shows an opposite APO response. In all models, O2 accounts for most APO flux variations. Detailed analysis in CESM shows that the O2 response is driven primarily by ENSO modulation of the source and rate of equatorial upwelling, which moderates the intensity of O2 uptake due to vertical transport of low-O2 waters. These upwelling changes dominate over counteracting effects of biological productivity and thermally driven O2 exchange. During El Niño, shallower and weaker upwelling leads to anomalous O2 outgassing, whereas deeper and intensified upwelling during La Niña drives enhanced O2 uptake. This response is strongly localized along the central and eastern equatorial Pacific, leading to an equatorial zonal dipole in atmospheric anomalies of APO. This dipole is further intensified by ENSO-related changes in winds, reconciling apparently conflicting APO observations in the tropical Pacific. These findings suggest a substantial and complex response of the oceanic O2 cycle to climate variability that is significantly (>50%) underestimated in magnitude by ocean models. ©2017. 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/77738
Appears in Collections: 气候变化事实与影响
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作者单位: Scripps Institution of Oceanography, University of California, San Diego, CA, United States; National Center for Atmospheric Research, Boulder, CO, United States; Program in Atmospheric and Oceanic Sciences, Princeton University, Princeton, NJ, United States; Max Planck Institute for Biogeochemistry, Jena, Germany
Recommended Citation:
Eddebbar Y,A,, Long M,et al. Impacts of ENSO on air-sea oxygen exchange: Observations and mechanisms[J]. Global Biogeochemical Cycles,2017-01-01,31(5)