DOI: 10.1002/2015GB005115
Scopus记录号: 2-s2.0-85027930013
论文题名: Fate of the Amazon River dissolved organic matter in the tropical Atlantic Ocean
作者: Medeiros P ; M ; , Seidel M ; , Ward N ; D ; , Carpenter E ; J ; , Gomes H ; R ; , Niggemann J ; , Krusche A ; V ; , Richey J ; E ; , Yager P ; L ; , Dittmar T
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2015
卷: 29, 期: 5 起始页码: 677
结束页码: 690
语种: 英语
英文关键词: Amazon River and plume
; DOM composition
; FT-ICR MS
; tropical Atlantic Ocean
Scopus关键词: biogeochemistry
; carbon cycle
; carbon dioxide
; deep sea
; dissolved organic matter
; molecular analysis
; oceanic circulation
; river flow
; river plume
; seasonal variation
; Amazon River
; Atlantic Ocean
; Atlantic Ocean (Tropical)
; Bacteria (microorganisms)
英文摘要: Constraining the fate of dissolved organic matter (DOM) delivered by rivers is a key to understand the global carbon cycle, since DOM mineralization directly influences air-sea CO2 exchange and multiple biogeochemical processes. The Amazon River exports large amounts of DOM, and yet the fate of this material in the ocean remains unclear. Here we investigate the molecular composition and transformations of DOM in the Amazon River-ocean continuum using ultrahigh resolution mass spectrometry and geochemical and biological tracers. We show that there is a strong gradient in source and composition of DOM along the continuum, and that dilution of riverine DOM in the ocean is the dominant pattern of variability in the system. Alterations in DOM composition are observed in the plume associated with the addition of new organic compounds by phytoplankton and with bacterial and photochemical transformations. The relative importance of each of these drivers varies spatially and is modulated by seasonal variations in river discharge and ocean circulation. We further show that a large fraction (50-76%) of the Amazon River DOM is surprisingly stable in the coastal ocean. This results in a globally significant river plume with a strong terrigenous signature and in substantial export of terrestrially derived organic carbon from the continental margin, where it can be entrained in the large-scale circulation and potentially contribute to the long-term storage of terrigenous production and to the recalcitrant carbon pool found in the deep 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/77970
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Marine Sciences, University of Georgia, Athens, GA, United States; Research Group for Marine Geochemistry (ICBM-MPI Bridging Group), University of Oldenburg, Oldenburg, Germany; School of Oceanography, University of Washington, Seattle, WA, United States; Department of Geological Sciences, University of Florida, Gainesville, FL, United States; Romberg Tiburon Center, San Francisco State University, Tiburon, CA, United States; Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States; Centro de Energia Nuclear na Agricultura, Universidade de São Paulo, Piracicaba, Brazil
Recommended Citation:
Medeiros P,M,, Seidel M,et al. Fate of the Amazon River dissolved organic matter in the tropical Atlantic Ocean[J]. Global Biogeochemical Cycles,2015-01-01,29(5)