Atmospheric Nitrogen Flux from the Watersheds of Major Estuaries of the United States: An Application of the SPARROW Watershed Model

Alexander, Richard B.; Smith, Richard A.; Schwarz, Gregory E.; Preston, Stephen D.; Brakebill, John W.; Srinivasan, Raghavan; Pacheco, Percy A.

doi:10.1029/ce057p0119

Cited by 39 publications

(23 citation statements)

References 33 publications

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“…Three national SPARROW models have been produced to represent different time frames (Smith et al. , 1997; Alexander et al. , 2001, 2008).…”

Section: Application Resultsmentioning

confidence: 99%

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Source and Delivery of Nutrients to Receiving Waters in the Northeastern and Mid-Atlantic Regions of the United States1

Moore¹,

Johnston²,

Smith³

et al. 2011

JAWRA Journal of the American Water Resources Association

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This study investigates nutrient sources and transport to receiving waters, in order to provide spatially detailed information to aid water-resources managers concerned with eutrophication and nutrient management strategies. SPAtially Referenced Regressions On Watershed attributes (SPARROW) nutrient models were developed for the Northeastern and Mid-Atlantic (NE US) regions of the United States to represent source conditions for the year 2002. The model developed to examine the source and delivery of nitrogen to the estuaries of nine large rivers along the NE US Seaboard indicated that agricultural sources contribute the largest percentage (37%) of the total nitrogen load delivered to the estuaries. Point sources account for 28% while atmospheric deposition accounts for 20%. A second SPARROW model was used to examine the sources and delivery of phosphorus to lakes and reservoirs throughout the NE US. The greatest attenuation of phosphorus occurred in lakes that were large relative to the size of their watershed. Model results show that, within the NE US, aquatic decay of nutrients is quite limited on an annual basis and that we especially cannot rely on natural attenuation to remove nutrients within the larger rivers nor within lakes with large watersheds relative to the size of the lake.

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“…Three national SPARROW models have been produced to represent different time frames (Smith et al. , 1997; Alexander et al. , 2001, 2008).…”

Section: Application Resultsmentioning

confidence: 99%

“…The atmospheric deposition dataset (Supplement B, Figure S2) used as input to the nitrogen SPARROW model is based on a simple inverse distance‐weighted interpolation of the National Atmospheric Deposition Program/National Trend Network (NADP/NTN) data (USGS, 2000) following the technique used by Alexander et al. (2001).…”

Section: Methodsmentioning

confidence: 99%

Source and Delivery of Nutrients to Receiving Waters in the Northeastern and Mid-Atlantic Regions of the United States1

Moore¹,

Johnston²,

Smith³

et al. 2011

JAWRA Journal of the American Water Resources Association

Self Cite

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“…(1995); (i) Compton et al. (2003); (j) Brown and Ozretich (2009); (k) Schaefer and Hollibaugh (2009); (l) Alexander et al. (2001); (m) Beaulac and Reckhow (1982).…”

Section: Resultsmentioning

confidence: 99%

“…While no comparable data for phosphorus was available for the PNW, our value of 0.19 kg/ha/year was close to the median value of 0.11 kg/ha/year calculated from available estimates of phosphorus release rates due to weathering for 12 river basins around the world (Gardner, 1990). The only data we found for the export of atmospherically derived nitrogen from PNW watersheds was estimated for the PUGT basin using the nationally calibrated SPARROW model (Alexander et al. , 2001).…”

Section: Discussionmentioning

confidence: 99%

Surface-Water Nutrient Conditions and Sources in the United States Pacific Northwest1

Wise

Johnson

2011

JAWRA Journal of the American Water Resources Association

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The SPAtially Referenced Regressions On Watershed attributes (SPARROW) model was used to perform an assessment of surface-water nutrient conditions and to identify important nutrient sources in watersheds of the Pacific Northwest region of the United States (U.S.) for the year 2002. Our models included variables representing nutrient sources as well as landscape characteristics that affect nutrient delivery to streams. Annual nutrient yields were higher in watersheds on the wetter, west side of the Cascade Range compared to watersheds on the drier, east side. High nutrient enrichment (relative to the U.S. Environmental Protection Agency's recommended nutrient criteria) was estimated in watersheds throughout the region. Forest land was generally the largest source of total nitrogen stream load and geologic material was generally the largest source of total phosphorus stream load generated within the 12,039 modeled watersheds. These results reflected the prevalence of these two natural sources and the low input from other nutrient sources across the region. However, the combined input from agriculture, point sources, and developed land, rather than natural nutrient sources, was responsible for most of the nutrient load discharged from many of the largest watersheds. Our results provided an understanding of the regional patterns in surface-water nutrient conditions and should be useful to environmental managers in future water-quality planning efforts.

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“…Whole body results were converted to fillet concentration using the regression equation for all species of Peterson et al (2005). Average Hg fish burdens were compared to estimated estuary N loads using the SPARROW model (Alexander et al, 2000). …”

Section: 0 Case Studiesmentioning

confidence: 99%

Nutrient supply and mercury dynamics in marine ecosystems: A conceptual model

Driscoll

Chen

Hammerschmidt

et al. 2012

Environmental Research

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Atmospheric Nitrogen Flux from the Watersheds of Major Estuaries of the United States: An Application of the SPARROW Watershed Model

Cited by 39 publications

References 33 publications

Source and Delivery of Nutrients to Receiving Waters in the Northeastern and Mid-Atlantic Regions of the United States1

Source and Delivery of Nutrients to Receiving Waters in the Northeastern and Mid-Atlantic Regions of the United States1

Surface-Water Nutrient Conditions and Sources in the United States Pacific Northwest1

Nutrient supply and mercury dynamics in marine ecosystems: A conceptual model

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