DOI: 10.1002/2017GB005669
Scopus记录号: 2-s2.0-85028952252
论文题名: Eddy-induced carbon transport across the Antarctic Circumpolar Current
作者: Moreau S ; , Penna A ; D ; , Llort J ; , Patel R ; , Langlais C ; , Boyd P ; W ; , Matear R ; J ; , Phillips H ; E ; , Trull T ; W ; , Tilbrook B ; , Lenton A ; , Strutton P ; G
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2017
卷: 31, 期: 9 起始页码: 1368
结束页码: 1386
语种: 英语
英文关键词: Antarctic Circumpolar Current
; carbon
; CO2
; eddies
; Southern Ocean
Scopus关键词: annual cycle
; Antarctic Circumpolar Wave
; aragonite
; carbon cycle
; carbon dioxide
; dissolved inorganic carbon
; eddy covariance
; mesoscale eddy
; oceanic circulation
; salinity
; subarctic region
; Antarctic Circumpolar Current
; Australia
; Southern Ocean
; Southern Ocean
; Tasmania
英文摘要: The implications of a mesoscale eddy for relevant properties of the Southern Ocean carbon cycle are examined with in situ observations. We explored carbon properties inside a large (~190 km diameter) cyclonic eddy that detached from the Subantarctic Front (SAF) south of Tasmania in March 2016. Based on remote sensing, the eddy was present for ~2 months in the Subantarctic Zone (SAZ), an important region of oceanic carbon dioxide (CO2) uptake throughout the annual cycle and carbon subduction (i.e., where mode and intermediate waters form), before it was reabsorbed into the SAF. The eddy was sampled during the middle of its life, 1 month after it spawned. Comparatively, the eddy was ~3°C colder, 0.5 practical salinity unit fresher, and less biologically productive than surrounding SAZ waters. The eddy was also richer in dissolved inorganic carbon (DIC) and had lower saturation states of aragonite and calcite than the surrounding SAZ waters. As a consequence, it was a strong source of CO2 to the atmosphere (with fluxes up to +25 mmol C m−2 d−1). Compared to the SAF waters, from which it originated, DIC concentration in the eddy was ~20 μmol kg−1 lower, indicating lateral mixing, small-scale recirculation, or eddy stirring with lower-DIC SAZ waters by the time the eddy was observed. As they are commonly spawned from the Antarctic Circumpolar Current, and as 50% of them decay in the SAZ (the rest being reabsorbed by the SAF-N), these types of eddies may represent a significant south-north transport pathway for carbon across the ACC and may alter the carbon properties of SAZ waters. ©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/77707
Appears in Collections: 气候变化事实与影响
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作者单位: Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, TAS, Australia; Australian Research Council Antarctic Gateway Partnership, University of Tasmania, Hobart, TAS, Australia; CSIRO, Commonwealth Scientific and Industrial Research Organisation, Oceans and Atmosphere, Hobart, TAS, Australia; Antarctic Climate and Ecosystems Co-operative Research Centre, University of Tasmania, Hobart, TAS, Australia; Université d'Aix-Marseille, Luminy, France; Australian Research Council Centre of Excellence for Climate System Science, University of Tasmania, Hobart, TAS, Australia
Recommended Citation:
Moreau S,, Penna A,D,et al. Eddy-induced carbon transport across the Antarctic Circumpolar Current[J]. Global Biogeochemical Cycles,2017-01-01,31(9)