DOI: 10.1002/2014GB004898
Scopus记录号: 2-s2.0-84927645747
论文题名: Dust deposition in the eastern Indian Ocean: The ocean perspective from Antarctica to the Bay of Bengal
作者: Grand M ; M ; , Measures C ; I ; , Hatta M ; , Hiscock W ; T ; , Buck C ; S ; , Landing W ; M
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2015
卷: 29, 期: 3 起始页码: 357
结束页码: 374
语种: 英语
英文关键词: CLIVAR
; dissolved Al
; dissolved Fe
; dust deposition
; Indian Ocean
; MADCOW
Scopus关键词: air-sea interaction
; atmospheric deposition
; atmospheric modeling
; dissolved load
; dust
; gyre
; in situ measurement
; river plume
; spatial distribution
; trace element
; upper ocean
; Antarctica
; Atlantic Ocean
; Bay of Bengal
; Ganges Delta
; Indian Ocean
英文摘要: Atmospheric deposition is an important but still poorly constrained source of trace micronutrients to the open ocean because of the dearth of in situ measurements of total deposition (i.e., wet + dry deposition) in remote regions. In this work, we discuss the upper ocean distribution of dissolved Fe and Al in the eastern Indian Ocean along a 95°E meridional transect spanning the Antarctic margin to the Bay of Bengal. We use the mixed layer concentration of dissolved Al in conjunction with empirical data in a simple steady state model to produce 75 estimates of total dust deposition that we compare with historical observations and atmospheric model estimates. Except in the northern Bay of Bengal where the Ganges-Brahmaputra river plume contributes to the inventory of dissolved Al, the surface distribution of dissolved Al along 95°E is remarkably consistent with the large-scale gradients in mineral dust deposition and multiple-source regions impacting the eastern Indian Ocean. The lowest total dust deposition fluxes are calculated for the Southern Ocean (66 ± 60 mg m-2 yr-1) and the highest for the northern end of the south Indian subtropical gyre (up to 940 mg m-2 yr-1 at 18°S) and in the southern Bay of Bengal (2500 ± 570 mg m-2 yr-1). Our total deposition fluxes, which have an uncertainty on the order of a factor of 3.5, are comparable with the composite atmospheric model data of Mahowald et al. (2005), except in the south Indian subtropical gyre where models may underestimate total deposition. Using available measurements of the solubility of Fe in aerosols, we confirm that dust deposition is a minor source of dissolved Fe to the Southern Ocean and show that aeolian deposition of dissolved Fe in the southern Bay of Bengal may be comparable to that observed underneath the Saharan dust plume in the Atlantic Ocean. ©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/77991
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Oceanography, University of Hawaii, Honolulu, HI, United States; Thermo Fisher Scientific, North Ryde, NSW, Australia; Skidaway Institute of Oceanography, University of Georgia, Savannah, GA, United States; Department of Earth, Ocean, and Atmospheric Science, Florida State University, Tallahassee, FL, United States
Recommended Citation:
Grand M,M,, Measures C,et al. Dust deposition in the eastern Indian Ocean: The ocean perspective from Antarctica to the Bay of Bengal[J]. Global Biogeochemical Cycles,2015-01-01,29(3)