DOI: 10.1002/2016GB005427
Scopus记录号: 2-s2.0-84979563804
论文题名: Origins, seasonality, and fluxes of organic matter in the Congo River
作者: Spencer R ; G ; M ; , Hernes P ; J ; , Dinga B ; , Wabakanghanzi J ; N ; , Drake T ; W ; , Six J
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2016
卷: 30, 期: 7 起始页码: 1105
结束页码: 1121
语种: 英语
英文关键词: Atlantic Ocean
; Congo River
; land-ocean
; lignin
; organic carbon
; organic matter
Scopus关键词: biogeochemical cycle
; biomarker
; dissolved organic carbon
; land-sea interaction
; lignin
; organic carbon
; organic matter
; particulate organic carbon
; residence time
; river discharge
; seasonal variation
; seasonality
; stable isotope
; suspended sediment
; vascular plant
; Amazon River
; Atlantic Ocean
; Congo River
; Tracheophyta
英文摘要: The Congo River in central Africa represents a major source of organic matter (OM) to the Atlantic Ocean. This study examined elemental (%OC, %N, and C:N), stable isotopic (δ13C and δ15N), and biomarker composition (lignin phenols) of particulate OM (POM) and dissolved OM (DOM) across the seasonal hydrograph. Even though the Congo exhibits an extremely stable intra-annual discharge regime, seasonal variability in OM composition was evident. DOM appears predominantly derived from vascular plant inputs with greater relative contribution during the rising limb and peak in discharge associated with the major November–December discharge maximum. Generally, POM appears to be sourced from soil-derived mineral-associated OM (low C:N, low Λ8, and higher (Ad:Al)v) but the relative proportion of fresh vascular plant material (higher C:N, higher Λ8, and lower (Ad:Al)v) increases with higher discharge. During the study period (September 2009 to November 2010) the Congo exported 29.21 Tg yr−1 of total suspended sediment (TSS), 1.96 Tg yr−1 of particulate organic carbon (POC), and 12.48 Tg yr−1 of dissolved organic carbon. The Congo exports an order of magnitude lower TSS load in comparison to other major riverine sources of TSS (e.g., Ganges and Brahmaputra), but due to its OM-rich character it actually exports a comparable amount of POC. The Congo is also 2.5 times more efficient at exporting dissolved lignin per unit volume compared to the Amazon. Including Congo dissolved lignin data in residence time calculations for lignin in the Atlantic Ocean results in an approximately 10% reduction from the existing estimate, suggesting that this material is more reactive than previously thought. ©2016. 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/77832
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Earth, Ocean and Atmospheric Science, Florida State University, Tallahassee, FL, United States; Department of Land, Air and Water Resources, University of California, Davis, CA, United States; Groupe de Recerche en Sciences Exactes et Naturelles (GRSEN/DGRST), Ministere de la Recherche Scientifique, Brazzaville, Congo; Department of Soil Physics and Hydrology, Congo Atomic Energy Commission, Kinshasa XI, Democratic Republic Congo; Department of Environmental Systems Science, Swiss Federal Institute of Technology, ETH Zurich, Zurich, Switzerland
Recommended Citation:
Spencer R,G,M,et al. Origins, seasonality, and fluxes of organic matter in the Congo River[J]. Global Biogeochemical Cycles,2016-01-01,30(7)