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

Handle URI:
http://hdl.handle.net/10754/554357
Title:
Anthropogenic nutrient sources rival natural sources on small scales in the coastal waters of the Southern California Bight
Authors:
Howard, Meredith D. A.; Sutula, Martha; Caron, David A.; Chao, Yi; Farrara, John D.; Frenzel, Hartmut; Jones, Burton ( 0000-0002-9599-1593 ) ; Robertson, George; McLaughlin, Karen; Sengupta, Ashmita
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.
KAUST Department:
Biological and Environmental Sciences and Engineering (BESE) Division
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
Journal:
Limnology and Oceanography
Issue Date:
26-Jan-2014
DOI:
10.4319/lo.2014.59.1.0285
Type:
Article
ISSN:
00243590
Additional Links:
http://doi.wiley.com/10.4319/lo.2014.59.1.0285
Appears in Collections:
Articles; Biological and Environmental Sciences and Engineering (BESE) Division; Biological and Environmental Sciences and Engineering (BESE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorHoward, Meredith D. A.en
dc.contributor.authorSutula, Marthaen
dc.contributor.authorCaron, David A.en
dc.contributor.authorChao, Yien
dc.contributor.authorFarrara, John D.en
dc.contributor.authorFrenzel, Hartmuten
dc.contributor.authorJones, Burtonen
dc.contributor.authorRobertson, Georgeen
dc.contributor.authorMcLaughlin, Karenen
dc.contributor.authorSengupta, Ashmitaen
dc.date.accessioned2015-05-21T06:33:01Zen
dc.date.available2015-05-21T06:33:01Zen
dc.date.issued2014-01-26en
dc.identifier.citationAnthropogenic nutrient sources rival natural sources on small scales in the coastal waters of the Southern California Bight 2014, 59 (1):285 Limnology and Oceanographyen
dc.identifier.issn00243590en
dc.identifier.doi10.4319/lo.2014.59.1.0285en
dc.identifier.urihttp://hdl.handle.net/10754/554357en
dc.description.abstractAnthropogenic 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.en
dc.relation.urlhttp://doi.wiley.com/10.4319/lo.2014.59.1.0285en
dc.rightsArchived with thanks to Limnology and Oceanographyen
dc.titleAnthropogenic nutrient sources rival natural sources on small scales in the coastal waters of the Southern California Bighten
dc.typeArticleen
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Divisionen
dc.identifier.journalLimnology and Oceanographyen
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionSouthern California Coastal Water Research Project, Costa Mesa, Californiaen
dc.contributor.institutionDepartment of Biological Sciences, University of Southern California, Los Angeles, Californiaen
dc.contributor.institutionJoint Institute for Regional Earth System Science and Engineering, University of California, Los Angeles, Los Angeles, Californiaen
dc.contributor.institutionDepartment of Atmospheric and Oceanic Sciences, University of California, Los Angeles, Los Angeles, Californiaen
dc.contributor.institutionOrange County Sanitation District, Fountain Valley, Californiaen
dc.contributor.institutionRemote Sensing Solutions, Pasadena, Californiaen
dc.contributor.institutionUniversity of Washington, Seattle, Washingtonen
kaust.authorJones, Burtonen
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