DOI: 10.1002/2015GB005252
Scopus记录号: 2-s2.0-84959421712
论文题名: Dissolved organic carbon in the deep Southern Ocean: Local versus distant controls
作者: Bercovici S ; K ; , Hansell D ; A
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2016
卷: 30, 期: 2 起始页码: 350
结束页码: 360
语种: 英语
英文关键词: dissolved organic carbon
; ocean carbon cycle
; Southern Ocean
Scopus关键词: allochthony
; autochthony
; carbon cycle
; concentration (composition)
; deep sea
; deep water
; dissolved organic carbon
; hydrography
; mass balance
; meridional circulation
; mixing
; Atlantic Ocean
; Atlantic Ocean (North)
; Indian Ocean
; Pacific Ocean
; Southern Ocean
英文摘要: The global ocean contains a massive reservoir (662 ± 32 Pg C) of dissolved organic carbon (DOC), and its dynamics, particularly in the deepest zones, are only slowly being understood. DOC in the deep ocean is ubiquitously low in concentration (∼35 to 48 μmol kg-1) and aged (4000 to 6000 years), persisting for multiple meridional overturning circulations. Deep waters relatively enriched in DOC form in the North Atlantic, migrate to the Southern Ocean to mix with waters from Antarctic shelves and the deep Pacific and Indian Oceans, in turn forming the voluminous waters of the Circumpolar Deep Water. Here we seek evidence for local (autochthonous) versus distant (allochthonous) processes in determining the distribution of DOC in the deep Southern Ocean. Prior analyses on DOC in the deep Southern Ocean have conflicted, describing both conservative and nonconservative traits: the deep DOC field has been reported as uniform in distribution, yet local inputs have been suggested as quantitatively important. We use multiple approaches (multiple linear regression, mass transport, and mass balance calculations) with data from Climate Variability and Predictability Repeat Hydrography sections to evaluate the system. We find that DOC concentrations in the deep Southern Ocean largely reflect the conservative mixing of the several deep waters entering the system from the north. Mass balance suggests that the relatively depleted DOC radiocarbon content in the deep Southern Ocean is a conserved property as well. These analyses advance our understanding of the controls on the DOC reservoir of the Southern Ocean. ©2016. 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/77878
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Ocean Sciences, Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL, United States
Recommended Citation:
Bercovici S,K,, Hansell D,et al. Dissolved organic carbon in the deep Southern Ocean: Local versus distant controls[J]. Global Biogeochemical Cycles,2016-01-01,30(2)