DOI: 10.1002/2014GB004998
Scopus记录号: 2-s2.0-84947126793
论文题名: Processes controlling the distributions of Cd and PO4 in the ocean
作者: Quay P ; , Cullen J ; , Landing W ; , Morton P
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2015
卷: 29, 期: 6 起始页码: 830
结束页码: 841
语种: 英语
英文关键词: cadmium
; GEOTRACES
; paleoceanography
; phosphate
Scopus关键词: biological uptake
; chlorophyll
; deep sea
; paleoceanography
; phosphate
; thermohaline circulation
; upwelling
; Pacific Ocean
; Pacific Ocean (North)
; Southern Ocean
英文摘要: Depth profiles of dissolved Cd and PO4 from a global data compilation were used to derive the Cd/P of particles exported from the surface layer, and the results indicate lowest values in the North Atlantic (0.17 ± 0.05), highest in the Southern (0.56 ± 0.24), and intermediate in the South Indian (0.31 ± 0.14) and North Pacific (0.36 ± 0.08) Ocean basins. The Cd/P of exported particles in high nutrient-low chlorophyll (HNLC) regions is twice that for particles exported in non-HNLC regions as is the fractionation effect during biological uptake of Cd and PO4, and these trends primarily determine the spatial trends of dissolved Cd/PO4 observed in the surface ocean. In deep waters the lowest dissolved Cd/PO4 of 0.23 ± 0.07 is found in the North Atlantic Ocean and the result primarily of low Cd/PO4 of North Atlantic Deep Water (0.23). In contrast, deep waters in the Southern Ocean have significantly higher dissolved Cd/PO4 (0.30 ± 0.06), which is a result of the Cd/PO4 of upwelled deep water from the South Pacific and South Indian (0.28) and the high Cd/P of degrading particles. A multibox model that accounts for the impacts of particle degradation and thermohaline circulation in the deep sea yields dissolved Cd and PO4 interbasin trends close to observations. Model experiments illustrate the dependence of the dissolved Cd/PO4 of the deep sea on the extent of HNLC conditions in the Southern Ocean and the impact on reconstructing paleo PO4 concentrations from a Cd proxy. © 2015. 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/78014
Appears in Collections: 气候变化事实与影响
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作者单位: School of Oceanography, University of Washington, Seattle, WA, United States; School of Earth and Ocean Sciences, University of Victoria, Victoria, BC, Canada; Department of Earth, Ocean, and Atmospheric Science, Florida State University, Tallahassee, FL, United States
Recommended Citation:
Quay P,, Cullen J,, Landing W,et al. Processes controlling the distributions of Cd and PO4 in the ocean[J]. Global Biogeochemical Cycles,2015-01-01,29(6)