DOI: 10.1002/2015GL064653
论文题名: Drought-induced variability in dissolved organic matter composition in a marsh-dominated estuary
作者: Medeiros P.M. ; Seidel M. ; Dittmar T. ; Whitman W.B. ; Moran M.A.
刊名: Geophysical Research Letters
ISSN: 0094-8639
EISSN: 1944-8370
出版年: 2015
卷: 42, 期: 15 起始页码: 6446
结束页码: 6453
语种: 英语
英文关键词: dissolved organic matter
; drought
; FT-ICR MS
; marshes
; molecular composition
Scopus关键词: Biogeochemistry
; Carbon
; Dissolution
; Drought
; Estuaries
; Isotopes
; Mass spectrometry
; Organic compounds
; Wetlands
; Discharge conditions
; Dissolved organic matters
; FT-ICR MS
; marshes
; Molecular compositions
; Multi-decadal time scale
; Stable carbon isotopes
; Ultrahigh resolution mass spectrometries
; Biological materials
; anthropogenic effect
; carbon isotope
; chemical composition
; dissolved organic matter
; drought
; estuarine environment
; hydrological regime
; river discharge
; saltmarsh
; timescale
英文摘要: The composition of dissolved organic matter (DOM) in an estuary characterized by extensive salt marsh vegetation was investigated at the molecular level using ultrahigh-resolution mass spectrometry and stable carbon isotope analyses. Samples from multiple seasons covered different hydrological regimes, including anomalously low-discharge conditions. The untargeted approach used allowed for identifying the DOM molecular signatures associated with different DOM sources in the estuary. DOM composition was strongly modulated by river discharge at monthly scales, with high river flow leading to significant increases in the terrigenous signature of the DOM throughout the estuary. During a severe/exceptional drought, estuarine DOM was imprinted with a distinct signature of marsh-derived compounds. The frequency of occurrence of anomalously low-discharge conditions seems to have increased over the last decades. If predictions of anthropogenically driven changes in hydroclimate are confirmed, they will likely be accompanied by changes in DOM composition in estuaries at multidecadal time scales. ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84940121893&doi=10.1002%2f2015GL064653&partnerID=40&md5=35aadc09f31da285e77de0306083d334
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8255
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Marine Sciences, University of Georgia, Athens, GA, United States
Recommended Citation:
Medeiros P.M.,Seidel M.,Dittmar T.,et al. Drought-induced variability in dissolved organic matter composition in a marsh-dominated estuary[J]. Geophysical Research Letters,2015-01-01,42(15).