DOI: 10.1002/2014GB004920
Scopus记录号: 2-s2.0-84927612066
论文题名: Dissolved Fe and Al in the upper 1000 m of the eastern Indian Ocean: A high-resolution transect along 95°E from the Antarctic margin to the Bay of Bengal
作者: Grand M ; M ; , Measures C ; I ; , Hatta M ; , Hiscock W ; T ; , Landing W ; M ; , Morton P ; L ; , Buck C ; S ; , Barrett P ; M ; , Resing J ; A
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2015
卷: 29, 期: 3 起始页码: 375
结束页码: 396
语种: 英语
英文关键词: Bay of Bengal
; CLIVAR
; dissolved Al
; dissolved Fe
; Indian Ocean
; Kerguelen Plateau
Scopus关键词: climate variation
; concentration (composition)
; dissolved load
; gyre
; metal
; oxygen
; remineralization
; resolution
; shelf sediment
; water mass
; Antarctica
; Bay of Bengal
; Indian Ocean
; Kerguelen Plateau
; Southern Ocean
英文摘要: A high-resolution section of dissolved iron (dFe) and aluminum (dAl) was obtained along ∼95°E in the upper 1000 m of the eastern Indian Ocean from the Antarctic margin (66°S) to the Bay of Bengal (18°N) during the U.S. Climate Variability and Predictability (CLIVAR) CO2 Repeat Hydrography I08S and I09N sections (February-April 2007). In the Southern Ocean, low concentrations of dAl (<1 n M) reflect the negligible dust inputs impacting the water masses subducted in the circumpolar domain. The low dAl concentrations characterizing the Southern Ocean terminate near 45°S, probably because of the advection of subtropical water masses that received dust and sedimentary inputs in their formation region. Our subsurface dFe data near the southern Kerguelen Plateau were significantly higher than historical observations in other Indian sectors of the Southern Ocean. We surmise that the offshore advection of dFe-rich waters along the western flank of the southern Kerguelen plateau and enhanced vertical mixing could contribute to this elevated subsurface dFe inventory. Elevated subsurface particulate and dFe levels downstream of the northern Kerguelen Plateau may reflect long-range lateral transport from the plateau's sediments and/or remineralization inputs. At the northern edge of the south Indian subtropical gyre, the deposition of Australian dust, possibly combined with the advection of dAl-enriched waters from the Indonesian Throughflow, creates a region of elevated dAl in the upper 400 m but without a corresponding enrichment in dFe. In the northern Indian Ocean, the South Equatorial Current constitutes a remarkable biogeochemical front separating the oxygen-rich and dFe-poor subtropical gyre waters from the dFe-rich and oxygen-depleted waters of the northern Indian Ocean. By tracing the accumulation of macronutrients and dFe along the advective pathway of Indian Central Water, we show that the central waters of the northern Indian Ocean receive excess dFe in addition to that produced by remineralization inputs. The resuspension of shelf sediments and release of pore waters probably contribute to the elevated dFe and dAl levels observed below the highly stratified upper layers of the Bay of Bengal. ©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/77994
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; Department of Earth, Ocean and Atmospheric Science, Florida State University, Tallahassee, FL, United States; Skidaway Institute of Oceanography, University of Georgia, Savannah, GA, United States; Joint Institute for the Study of the Atmosphere and Ocean, University of Washington and PMEL/NOAA, Seattle, WA, United States
Recommended Citation:
Grand M,M,, Measures C,et al. Dissolved Fe and Al in the upper 1000 m of the eastern Indian Ocean: A high-resolution transect along 95°E from the Antarctic margin to the Bay of Bengal[J]. Global Biogeochemical Cycles,2015-01-01,29(3)