A baseline of terrestrial freshwater and nitrogen fluxes to the Southern California Bight, USA

MARINE POLLUTION BULLETIN

卷:170

Article

Sutula, Martha¹  Ho, Minna¹  Sengupta, Ashmita²  Kessouri, Faycal¹  McLaughlin, Karen¹  McCune, Kenny¹  Bianchi, Daniele³ 

[1] Southern Calif Coastal Water Res Project, Costa Mesa, CA 92626 USA

[2] CSIRO Land & Water, Canberra, ACT, Australia

[3] Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA USA

关键词: Coastal exports;    Nutrients;    Terrestrial fluxes;    Wastewater;    Point and non-point sources;    Recycling;    Climate change;   

DOI  :  10.1016/j.marpolbul.2021.112669

来源: Elsevier

【 摘 要 】

Time series were compiled of terrestrial nitrogen, phosphorus, carbon, iron, and silica fluxes to the Southern California Bight (SCB), a U.S. West Coast embayment (Sutula et al., 2021). Monitoring data and model output were used to construct a baseline of inputs from direct point source (PS) discharges of wastewater treatment (WWT) effluent (via ocean outfalls) and PS, non-point and natural sources from coastal rivers. The baseline covers 1971-2017 for large WWT plants discharging >50 million gallons per day (MGD) and 1997-2017 for small WWT plants and rivers. PS are the dominant nitrogen source, with contributions of 70% of the total annual freshwater discharge and 95% of nitrogen loads. WWT upgrades have reduced organic nitrogen loads by 73% since 1971. Inorganic nitrogen loads have generally held constant (35-40 Gg y-1) for the large WWT plants. This baseline represents a period prior to extensive wastewater and stormwater recycling that is increasing in the region.

【 授权许可】

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