DOI: 10.1002/2017JC013671
Scopus记录号: 2-s2.0-85044977905
论文题名: The Remobilization and Removal of Fe in Estuary—A Case Study in the Changjiang Estuary, China
作者: Zhu X. ; Zhang R. ; Wu Y. ; Zhu J. ; Bao D. ; Zhang J.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期: 4 起始页码: 2539
结束页码: 2553
语种: 英语
英文关键词: Changjiang Estuary
; dissolved iron
; mouth bar area
; remobilization
; removal
; turbidity maximum zone
Scopus关键词: bar
; biogeochemical cycle
; coastal zone
; concentration (composition)
; estuarine front
; iron
; remobilization
; spatial variation
; turbidity
; water budget
; China
; Yangtze Estuary
英文摘要: Dissolved iron (dFe) delivered by rivers plays a vital role in supporting primary productivity in coastal ecosystems. River-borne Fe is generally removed in estuaries due to the salt-induced flocculation. However, effects of the river mouth bar area on the variations of dFe concentration are frequently overlooked. Here we show the results of quasi-synchronous observation conducted in three water channels in the mouth bar area of the Changjiang Estuary during both spring and neap tides in July 2014. dFe showed high spatial variation, from 2.63 to 690 nM, with higher values commonly found in the inner study area. An episode of significant Fe remobilization was observed in the inner mouth bar before the removal in the subsequent fresh-saline water mixing process. Averaged dFe concentration increased from 45.2 ± 22.9 nM at Xuliujing to 188 ± 185 nM in the inner salinity (S) ≤ 1 water, then decreased to 10.3 ± 9.53 nM in the outer S > 1 water. Budget calculations revealed that the Changjiang input was the largest terrestrial source for dFe, while desorption from particles was the main reason for dFe enhancement in the study area. The entire mouth bar area was identified as a net sink for dFe, whereas, its S ≤ 1 and S > 1 zones were a source and a sink, respectively. We suggest that the mouth bar area diversifies the biogeochemical behavior of Fe in the estuary and enhances Fe output flux. Our study offers a new insight for better understanding the behavior of Fe and other particle-reactive elements in large dynamic estuaries. © 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/114135
Appears in Collections: 气候减缓与适应
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作者单位: School of Ecological and Environmental Sciences, East China Normal University, Shanghai, China; State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, China; Institute of Oceanography, Shanghai Jiao Tong University, Shanghai, China
Recommended Citation:
Zhu X.,Zhang R.,Wu Y.,et al. The Remobilization and Removal of Fe in Estuary—A Case Study in the Changjiang Estuary, China[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(4)