| DOI: | 10.1002/2015GB005215
|
| Scopus记录号: | 2-s2.0-84955349880
|
| 论文题名: | Cadmium regeneration within the North Atlantic |
| 作者: | Roshan S; , Wu J
|
| 刊名: | Global Biogeochemical Cycles
|
| ISSN: | 8866236
|
| 出版年: | 2015
|
| 卷: | 29, 期:12 | | 起始页码: | 2082
|
| 结束页码: | 2094
|
| 语种: | 英语
|
| 英文关键词: | dissolved cadmium
; microfossils Cd/Ca
; regeneration
; water mass mixing
|
| Scopus关键词: | benthos
; biogeochemical cycle
; cadmium
; calcium
; dissolved matter
; microfossil
; mixing
; model test
; oceanic circulation
; reconstruction
; spatial distribution
; transect
; water depth
; water mass
; Atlantic Ocean
; Atlantic Ocean (North)
; Atlantic Ocean (South)
|
| 英文摘要: | Cadmium (Cd) incorporated into the benthic microfossils has been widely used in reconstructing the past water circulation in the North Atlantic. This requires a major control by conservative mixing over regeneration process on the seawater cadmium distribution in the North Atlantic. Through coupling the recently reported Cd data at depths below 300 m with quantitative water mass analysis along the GA03 transect, we tested two models for cadmium cycling within the North Atlantic: conservative mixing alone and conservative mixing plus regeneration which is termed as regenerative mixing. The results show that the regenerative mixing model reproduces the observations (slope = 0.99 and R2 = 0.97) much better than the conservative mixing model (slope = 0.99 and R2 = 0.88). The regenerative mixing model was applied to estimate the amount of dissolved cadmium regenerated "within" the North Atlantic. This regionally regenerated cadmium contributes to ∼10% and >50% of the total cadmium in the North Atlantic at depths >1000 m and 300-1000 m, respectively, indicating that the microfossil-reconstructed seawater Cd can be attributed to the mixing from the South Atlantic to the North Atlantic with high accuracy for depths below 1000 m, while within 300-1000 m cadmium is more controlled by the regeneration process than the mixing process, complicating the attribution of the microfossil-reconstructed seawater Cd to the changes in water mass geometry within this 300-1000 m depth range. A regionally and vertically constant Cd/PO4 3- regeneration ratio ∼262 pM/μmol/kg was derived from the regenerative mixing model which is comparable with ratios estimated in the recent studies for the North Atlantic. ©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/77901
|
| 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
|
| Recommended Citation: | |
Roshan S,, Wu J. Cadmium regeneration within the North Atlantic[J]. Global Biogeochemical Cycles,2015-01-01,29(12)
|
|
|