DOI: 10.1002/2017JC012861
Scopus记录号: 2-s2.0-85041615123
论文题名: Evaluating Southern Ocean Carbon Eddy-Pump From Biogeochemical-Argo Floats
作者: Llort J. ; Langlais C. ; Matear R. ; Moreau S. ; Lenton A. ; Strutton P.G.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期: 2 起始页码: 971
结束页码: 984
语种: 英语
英文关键词: biogeochemical Argo
; carbon export
; eddy-pump
; Southern Ocean
; subduction events
Scopus关键词: bathymetry
; biogeochemical cycle
; carbon flux
; eddy
; kinetic energy
; particulate organic carbon
; subduction
; surface water
; Southern Ocean
英文摘要: The vertical transport of surface water and carbon into ocean's interior, known as subduction, is one of the main mechanisms through which the ocean influences Earth's climate. New instrumental approaches have shown the occurrence of localized and intermittent subduction episodes associated with small-scale ocean circulation features. These studies also revealed the importance of such events for the export of organic matter, the so-called eddy-pump. However, the transient and localized nature of episodic subduction hindered its large-scale evaluation to date. In this work, we present an approach to detect subduction events at the scale of the Southern Ocean using measurements collected by biogeochemical autonomous floats (BGCArgo). We show how subduction events can be automatically identified as anomalies of spiciness and Apparent Oxygen Utilization (AOU) below the mixed layer. Using this methodology over more than 4,000 profiles, we detected 40 subduction events unevenly distributed across the Sothern Ocean. Events were more likely found in hot spots of eddy kinetic energy (EKE), downstream major bathymetric features. Moreover, the bio-optical measurements provided by BGCArgo allowed measuring the amount of Particulate Organic Carbon (POC) being subducted and assessing the contribution of these events to the total downward carbon flux at 100 m (EP100). We estimated that the eddy-pump represents less than 19% to the EP100 in the Southern Ocean, although we observed particularly strong events able to locally duplicate the EP100. This approach provides a novel perspective on where episodic subduction occurs that will be naturally improved as BGCArgo observations continue to increase. © 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/114486
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Institute of Marine and Antarctic Sciences, University of Tasmania, Hobart, TAS, Australia; Australian Research Council Centre of Excellence for Climate System Science, Hobart, TAS, Australia; CSIRO Oceans and Atmosphere, Hobart, TAS, Australia; Australian Research Council Antarctic Gateway Strategic Research Initiative, Hobart, TAS, Australia; Antarctic Climate and Ecosystems CRC, Hobart, TAS, Australia
Recommended Citation:
Llort J.,Langlais C.,Matear R.,et al. Evaluating Southern Ocean Carbon Eddy-Pump From Biogeochemical-Argo Floats[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(2)