DOI: 10.1002/2016GB005556
Scopus记录号: 2-s2.0-85031731775
论文题名: Controls on the Cadmium-Phosphate Relationship in the Tropical South Pacific
作者: Roshan S ; , Wu J ; , DeVries T
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2017
卷: 31, 期: 10 起始页码: 1516
结束页码: 1527
语种: 英语
英文关键词: cadmium-phosphate relationship
; dissolved cadmium
; equatorial South Pacific
; U.S. GEOTRACES
; uptake ratio
Scopus关键词: biological uptake
; cadmium
; dissolved matter
; isotopic ratio
; nutrient cycling
; oceanic circulation
; phosphate
; tracer
; water mass
; Pacific Ocean
; Pacific Ocean (Equatorial)
; Pacific Ocean (South)
英文摘要: The relationship between dissolved cadmium (Cd) and phosphate (PO4 −3) can elucidate a biological role for Cd in the ocean and help to evaluate the usefulness of Cd as a tracer of past ocean circulation and nutrient distributions. Here we determine and analyze this relationship in the poorly studied region of the tropical South Pacific. The dissolved Cd distribution is generally similar to PO4 3−, but a plot of Cd versus PO4 3− shows a clear concavity resulting from distinct Cd:PO4 3− ratios in waters local to our transect and in waters formed distally in higher latitudes. To determine the factors affecting the subsurface Cd:PO4 3− ratio along our transect, we used an ocean circulation model and a multilinear regression model to determine the preformed and regenerated components of dissolved Cd and PO4 3−. We found that both the preformed and regenerated Cd:PO4 3− ratios are low in the shallow, locally formed water masses along the transect and significantly higher in the deeper and older water masses. Overall, the regenerated:preformed Cd:PO4 3− ratio in the deep waters (>1,000 m) along our transect is ~1.8:1, reflecting the basin-wide average Cd:PO4 3− “fractionation factor” during biological uptake. However, we find a lower fractionation factor in local waters of 1.1 (± 0.6). We suggest that this locally lower biological fractionation factor is due to either the chemical speciation of Cd or to a lower efficiency of Cd assimilation by the picoplankton and nanoplankton species found in our study region. ©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/77697
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Rosenstiel School of Marine and Atmospheric Science, University of Miami, Coral Gables, FL, United States; Department of Geography, University of California, Santa Barbara, CA, United States; College of Life Science and Oceanography, Shenzhen University, Shenzhen, China; Earth Research Institute, University of California, Santa Barbara, CA, United States
Recommended Citation:
Roshan S,, Wu J,, DeVries T. Controls on the Cadmium-Phosphate Relationship in the Tropical South Pacific[J]. Global Biogeochemical Cycles,2017-01-01,31(10)