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    Anthropogenic nutrient sources rival natural sources on small scales in the coastal waters of the Southern California Bight

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    Type
    Article
    Authors
    Howard, Meredith D. A.
    Sutula, Martha
    Caron, David A.
    Chao, Yi
    Farrara, John D.
    Frenzel, Hartmut
    Jones, Burton cc
    Robertson, George
    McLaughlin, Karen
    Sengupta, Ashmita
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Marine Science Program
    Red Sea Research Center (RSRC)
    Date
    2014-01-26
    Online Publication Date
    2014-01-26
    Print Publication Date
    2014-01
    Permanent link to this record
    http://hdl.handle.net/10754/554357
    
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    Abstract
    Anthropogenic nutrients have been shown to provide significant sources of nitrogen (N) that have been linked to increased primary production and harmful algal blooms worldwide. There is a general perception that in upwelling regions, the flux of anthropogenic nutrient inputs is small relative to upwelling flux, and therefore anthropogenic inputs have relatively little effect on the productivity of coastal waters. To test the hypothesis that natural sources (e.g., upwelling) greatly exceed anthropogenic nutrient sources to the Southern California Bight (SCB), this study compared the source contributions of N from four major nutrient sources: (1) upwelling, (2) treated wastewater effluent discharged to ocean outfalls, (3) riverine runoff, and (4) atmospheric deposition. This comparison was made using large regional data sets combined with modeling on both regional and local scales. At the regional bight-wide spatial scale, upwelling was the largest source of N by an order of magnitude to effluent and two orders of magnitude to riverine runoff. However, at smaller spatial scales, more relevant to algal bloom development, natural and anthropogenic contributions were equivalent. In particular, wastewater effluent and upwelling contributed the same quantity of N in several subregions of the SCB. These findings contradict the currently held perception that in upwelling-dominated regions anthropogenic nutrient inputs are negligible, and suggest that anthropogenic nutrients, mainly wastewater effluent, can provide a significant source of nitrogen for nearshore productivity in Southern California coastal waters.
    Citation
    Anthropogenic nutrient sources rival natural sources on small scales in the coastal waters of the Southern California Bight 2014, 59 (1):285 Limnology and Oceanography
    Publisher
    Wiley
    Journal
    Limnology and Oceanography
    DOI
    10.4319/lo.2014.59.1.0285
    Additional Links
    http://doi.wiley.com/10.4319/lo.2014.59.1.0285
    ae974a485f413a2113503eed53cd6c53
    10.4319/lo.2014.59.1.0285
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Red Sea Research Center (RSRC); Marine Science Program

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