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Increased nitrogen export from eastern North America to the Atlantic Ocean due to climatic and anthropogenic changes during 1901-2008


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dc.contributorHanqin Tian, tianhan@auburn.eduen_US
dc.creatorYang, Qichun
dc.creatorTian, Hanqin
dc.creatorFriedrichs, Marjorie
dc.creatorHopkinson, Charles
dc.creatorLu, Chaoqun
dc.creatorNajjar, Raymond
dc.date.accessioned2023-01-25T19:46:45Z
dc.date.available2023-01-25T19:46:45Z
dc.date.created2015
dc.identifier10.1002/2014JG002763en_US
dc.identifier.urihttps://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2014JG002763en_US
dc.identifier.urihttps://aurora.auburn.edu/handle/11200/50490
dc.identifier.urihttp://dx.doi.org/10.35099/aurora-558
dc.description.abstractWe used a process-based land model, Dynamic Land Ecosystem Model 2.0, to examine how climatic and anthropogenic changes affected riverine fluxes of ammonium (NH4+), nitrate (NO3-), dissolved organic nitrogen (DON), and particulate organic nitrogen (PON) from eastern North America, especially the drainage areas of the Gulf of Maine (GOM), Mid-Atlantic Bight (MAB), and South Atlantic Bight (SAB) during 1901-2008. Model simulations indicated that annual fluxes of NH4+, NO3-, DON, and PON from the study area during 1980-2008 were 0.0190.003 (mean1 standard deviation) TgNyr(-1), 0.180.035TgNyr(-1), 0.100.016TgNyr(-1), and 0.043 +/- 0.008TgNyr(-1), respectively. NH4+, NO3-, and DON exports increased while PON export decreased from 1901 to 2008. Nitrogen export demonstrated substantial spatial variability across the study area. Increased NH4+ export mainly occurred around major cities in the MAB. NO3- export increased in most parts of the MAB but decreased in parts of the GOM. Enhanced DON export was mainly distributed in the GOM and the SAB. PON export increased in coastal areas of the SAB and northern parts of the GOM but decreased in the Piedmont areas and the eastern parts of the MAB. Climate was the primary reason for interannual variability in nitrogen export; fertilizer use and nitrogen deposition tended to enhance the export of all nitrogen species; livestock farming and sewage discharge were also responsible for the increases in NH4+ and NO3- fluxes; and land cover change (especially reforestation of former agricultural land) reduced the export of the four nitrogen species.en_US
dc.formatPDFen_US
dc.publisherAmerican Geophysical Unionen_US
dc.relation.ispartofJOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCESen_US
dc.relation.ispartofseries2169-8953en_US
dc.rights©American Geophysical Union 2015. 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:en_US
dc.titleIncreased nitrogen export from eastern North America to the Atlantic Ocean due to climatic and anthropogenic changes during 1901-2008en_US
dc.typeTexten_US
dc.type.genreJournal Article, Academic Journalen_US
dc.citation.volume120en_US
dc.citation.issue6en_US
dc.citation.spage1046en_US
dc.citation.epage1068en_US
dc.description.statusPublisheden_US
dc.description.peerreviewYesen_US
dc.creator.orcid0000-0002-1806-4091en_US
dc.creator.orcid0000-0002-1526-0513en_US
dc.creator.orcid0000-0002-1526-0513en_US
dc.creator.orcid0000-0002-7331-8322en_US
dc.creator.orcid0000-0002-8689-2550en_US
dc.creator.orcid0000-0003-2828-7595en_US

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