globalchange  > 气候变化事实与影响
DOI: 10.1002/2014GB005068
Scopus记录号: 2-s2.0-84945174859
论文题名:
Climate extremes dominating seasonal and interannual variations in carbon export from the Mississippi River Basin
作者: Tian H; , Ren W; , Yang J; , Tao B; , Cai W; -J; , Lohrenz S; E; , Hopkinson C; S; , Liu M; , Yang Q; , Lu C; , Zhang B; , Banger K; , Pan S; , He R; , Xue Z
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2015
卷: 29, 期:9
起始页码: 1333
结束页码: 1347
语种: 英语
英文关键词: carbon export ; climate extreme ; land use ; land-ocean interface ; Mississippi River
Scopus关键词: annual variation ; biogeochemical cycle ; carbon budget ; climate change ; extreme event ; global climate ; inorganic carbon ; Intergovernmental Panel on Climate Change ; land use ; land-sea interaction ; organic carbon ; seasonal variation ; Atlantic Ocean ; Gulf of Mexico ; Mississippi River ; United States
英文摘要: Knowledge about the annual and seasonal patterns of organic and inorganic carbon (C) exports from the major rivers of the world to the coastal ocean is essential for our understanding and potential management of the global C budget so as to limit anthropogenic modification of global climate. Unfortunately our predictive understanding of what controls the timing, magnitude, and quality of C export is still rudimentary. Here we use a process-based coupled hydrologic/ecosystem biogeochemistry model (the Dynamic Land Ecosystem Model) to examine how climate variability and extreme events, changing land use, and atmospheric chemistry have affected the annual and seasonal patterns of C exports from the Mississippi River basin to the Gulf of Mexico. Our process-based simulations estimate that the average annual exports of dissolved organic C (DOC), particulate organic C (POC), and dissolved inorganic C (DIC) in the 2000s were 2.6 ± 0.4 Tg C yr-1, 3.4 ± 0.3 Tg C yr-1, and 18.8 ± 3.4 Tg C yr-1, respectively. Although land use change was the most important agent of change in C export over the past century, climate variability and extreme events (such as flooding and drought) were primarily responsible for seasonal and interannual variations in C export from the basin. The maximum seasonal export of DIC occurred in summer while for DOC and POC the maximum occurred in winter. Relative to the 10 year average (2001-2010), our modeling analysis indicates that the years of maximal and minimal C export cooccurred with wet and dry years (2008: 32% above average and 2006: 32% below average). Given Intergovernmental Panel on Climate Change-predicted changes in climate variability and the severity of rain events and droughts of wet and dry years for the remainder of the 21st century, our modeling results suggest major changes in the riverine link between the terrestrial and oceanic realms, which are likely to have a major impact on C delivery to the coastal ocean. ©2015. The Authors.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77939
Appears in Collections:气候变化事实与影响

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作者单位: International Center for Climate and Global Change Research, Auburn University, Auburn, AL, United States; Department of Plant and Soil Sciences, College of Agriculture, Food, and Environment, University of Kentucky, Lexington, KY, United States; School of Marine Science and Policy, University of Delaware, Newark, DE, United States; School for Marine Science and Technology, University of Massachusetts Dartmouth, New Bedford, MA, United States; Department of Marine Sciences, University of Georgia, Athens, GA, United States; Department of Civil and Environmental Engineering, Washington State University, Pullman, WA, United States; Department of Marine, Earth and Atmospheric Sciences, North Carolina State University, Raleigh, NC, United States; Department of Oceanography and Coastal Sciences, Louisiana State University, Baton Rouge, LA, United States

Recommended Citation:
Tian H,, Ren W,, Yang J,et al. Climate extremes dominating seasonal and interannual variations in carbon export from the Mississippi River Basin[J]. Global Biogeochemical Cycles,2015-01-01,29(9)
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