DOI: 10.1002/2013GB004600
Scopus记录号: 2-s2.0-84889042498
论文题名: Seasonally different carbon flux changes in the Southern Ocean in response to the southern annular mode
作者: Hauck J ; , Völker C ; , Wang T ; , Hoppema M ; , Losch M ; , Wolf-Gladrow D ; A
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2013
卷: 27, 期: 4 起始页码: 1236
结束页码: 1245
语种: 英语
英文关键词: carbon cycle
; carbon sink
; southern annular mode
; Southern Ocean
Scopus关键词: Biological mechanisms
; Biological production
; Carbon cycles
; Carbon sink
; Phytoplankton growth
; Southern Annular Mode
; Southern ocean
; Stratospheric ozone depletion
; Budget control
; Carbon dioxide
; Greenhouse gases
; Oceanography
; Regression analysis
; Carbon
; biogeochemical cycle
; biological pump
; carbon flux
; greenhouse gas
; oceanic general circulation model
; ozone depletion
; phytoplankton
; seasonality
; stratosphere
; westerly
; Southern Ocean
英文摘要: Stratospheric ozone depletion and emission of greenhouse gases lead to a trend of the southern annular mode (SAM) toward its high-index polarity. The positive phase of the SAM is characterized by stronger than usual westerly winds that induce changes in the physical carbon transport. Changes in the natural carbon budget of the upper 100 m of the Southern Ocean in response to a positive SAM phase are explored with a coupled ecosystem-general circulation model and regression analysis. Previously overlooked processes that are important for the upper ocean carbon budget during a positive SAM period are identified, namely, export production and downward transport of carbon north of the polar front (PF) as large as the upwelling in the south. The limiting micronutrient iron is brought into the surface layer by upwelling and stimulates phytoplankton growth and export production but only in summer. This leads to a drawdown of carbon and less summertime outgassing (or more uptake) of natural CO2. In winter, biological mechanisms are inactive, and the surface ocean equilibrates with the atmosphere by releasing CO2. In the annual mean, the upper ocean region south of the PF loses more carbon by additional export production than by the release of CO2 into the atmosphere, highlighting the role of the biological carbon pump in response to a positive SAM event. Key Points The response of carbon fluxes varies between seasons More biological production at positive SAM south of 55S Uptake of natural CO2 in summer in contrast to mean response due to biology © 2013 The Authors. Global Biogeochemical Cycles published byWiley on behalf of the American Geophysical Union. © 2013 The Authors. Global Biogeochemical Cycles published byWiley on behalf of the American Geophysical Union. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77565
Appears in Collections: 气候变化事实与影响
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作者单位: Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Postfach 12 01 61, 27515 Bremerhaven, Germany
Recommended Citation:
Hauck J,, Völker C,, Wang T,et al. Seasonally different carbon flux changes in the Southern Ocean in response to the southern annular mode[J]. Global Biogeochemical Cycles,2013-01-01,27(4)