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Century-long increasing trend and variability of dissolved organic carbon export from the Mississippi River basin driven by natural and anthropogenic forcing


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dc.contributorHanqin Tian, tianhan@auburn.eduen_US
dc.creatorRen, Wei
dc.creatorTian, Hanqin
dc.creatorCai, Wei-Jun
dc.creatorLohrenz, Steven E.
dc.creatorHopkinson, Charles S
dc.creatorHuang, Wei-Jen
dc.creatorYang, Jia
dc.creatorTao, Bo
dc.creatorPan, Shufen
dc.creatorHe, Ruoying
dc.date.accessioned2020-04-02T04:03:50Z
dc.date.available2020-04-02T04:03:50Z
dc.date.created2016-09
dc.identifier10.1002/2016GB005395en_US
dc.identifier.urihttps://agupubs.onlinelibrary.wiley.com/doi/10.1002/2016GB005395en_US
dc.identifier.urihttp://hdl.handle.net/11200/49782
dc.description.abstractThere has been considerable debate as to how natural forcing and anthropogenic activities alter the timing and magnitude of the delivery of dissolved organic carbon (DOC) to the coastal ocean, which has ramifications for the ocean carbon budget, land-ocean interactions, and coastal life. Here we present an analysis of DOC export from the Mississippi River to the Gulf of Mexico during 1901-2010 as influenced by changes in climate, land use and management practices, atmospheric CO2, and nitrogen deposition, through the integration of observational data with a coupled hydrologic/biogeochemical land model. Model simulations show that DOC export in the 2000s increased more than 40% since the 1900s. For the recent three decades (1981-2010), however, our simulated DOC export did not show a significant increasing trend, which is consistent with observations by U.S. Geological Survey. Our factorial analyses suggest that land use and land cover change, including land management practices (LMPs: i.e., fertilization, irrigation, tillage, etc.), were the dominant contributors to the century-scale trend of rising total riverine DOC export, followed by changes in atmospheric CO2, nitrogen deposition, and climate. Decadal and interannual variations of DOC export were largely attributed to year-to-year climatic variability and extreme flooding events, which have been exacerbated by human activity. LMPs show incremental contributions to DOC increase since the 1960s, indicating the importance of sustainable agricultural practices in coping with future environmental changes such as extreme flooding events. Compared to the observational-based estimate, the modeled DOC export was 20% higher, while DOC concentrations were slightly lower. Further refinements in model structure and input data sets should enable reductions in uncertainties in our prediction of century-long trends in DOC.en_US
dc.formatPDFen_US
dc.publisherAMER GEOPHYSICAL UNIONen_US
dc.relation.ispartofGlobal Biogeochemical Cyclesen_US
dc.relation.ispartofseries0886-6236en_US
dc.rights©The Authors 2016. This is this the version of record co-published by the American Geophysical Union and John Wiley & Sons, Inc. It is made available under the CC-BY-NC-ND 4.0 license. Item should be cited as: Item should be cited as: Ren, W., Tian, H., Cai, W. J., Lohrenz, S. E., Hopkinson, C. S., Huang, W. J., ... & He, R. (2016). Century‐long increasing trend and variability of dissolved organic carbon export from the Mississippi River basin driven by natural and anthropogenic forcing. Global Biogeochemical Cycles, 30(9), 1288-1299.en_US
dc.subjectGULF-OF-MEXICOen_US
dc.subjectSOUTHERN UNITED-STATESen_US
dc.subjectTERRESTRIAL ECOSYSTEMSen_US
dc.subjectCLIMATE-CHANGEen_US
dc.subjectNITROGEN DEPOSITIONen_US
dc.subjectTEMPERATE FORESTSen_US
dc.subjectATMOSPHERIC CO2en_US
dc.subjectNorth-Americaen_US
dc.subjectCoastal Zoneen_US
dc.subjectLand Useen_US
dc.titleCentury-long increasing trend and variability of dissolved organic carbon export from the Mississippi River basin driven by natural and anthropogenic forcingen_US
dc.typeCollectionen_US
dc.type.genreJournal Article, Academic Journalen_US
dc.citation.volume30en_US
dc.citation.issue9en_US
dc.citation.spage1288en_US
dc.citation.epage1299en_US
dc.description.statusPublisheden_US
dc.description.peerreviewYesen_US
dc.creator.orcid0000-0002-1806-4091en_US
dc.creator.orcid0000-0001-7920-1427en_US

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