Spatiotemporal development of physical,chemical, and biological characteristics of stormwater plumes in Santa Monica Bay,California (USA) |
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| Authors: | Alina A Corcoran Kristen M Reifel Burton H Jones Rebecca F Shipe |
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| Institution: | 1. Centro de Oceanografia, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal;2. Tufts University, Department of Biology, 200 Boston Ave, Medford, MA 02144, USA;3. Université du Littoral côte d''opale, FRE 2816 ELICO, avenue Foch, 62930 Wimereux, France;1. Centro de Oceanografia, Faculdade de Ciências da Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal;2. Departamento de Biologia, Universidade de Évora, 7002-554 Évora, Portugal;3. Câmara Municipal de Lisboa, Departamento de Ambiente e Espaço Público, Direção Municipal de Ambiente Urbano, Av. 24 de Julho, 171 C, 1399-021 Lisboa, Portugal;4. Departamento de Biologia Animal, Faculdade de Ciências da Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal;1. Sapphire Energy, Inc., 10996 Torreyana Rd, Suite 280, San Diego, CA 92121, USA;2. New Mexico Consortium, 100 Entrada Dr, Los Alamos, NM 87544, USA;3. Renew Biopharma, 11555 Sorrento Valley Road, San Diego, CA 92121, USA;4. Midland College, 3600 N Garfield, Midland, TX 79705, USA;5. Indigo Agriculture, 500 Rutherford Ave, Boston, MA 02129, USA;6. Unity Biotechnology, 3280 Bayshore Blvd, Brisbane, CA 94005, USA |
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| Abstract: | This study characterized stormwater plume development and associated phytoplankton dynamics in a coastal marine ecosystem through shipboard monitoring. We focused on plumes within Santa Monica Bay, California (USA), a coastal system that is subject to rapid pulses of untreated runoff from the urbanized watershed of Los Angeles during the winter rainy season. The physical, chemical, and biological signatures of stormwater plumes were tracked over time after each of 4 precipitation events ranging in magnitude from 1.5 cm to 9 cm. Low salinity surface plumes persisted in Santa Monica Bay for at least 2 to 5 days over spatial scales of up to 15 km. This is consistent with a 6-day residence time for surface water plume parcels, which was estimated from a drifter trajectory in the bay. Shipboard sampling and salinity measurements in the surf zone showed that plumes often persisted even longer nearshore. Plume waters were generally characterized by higher concentrations of dissolved nitrogen, colored dissolved organic matter, and higher light attenuation than non-plume waters. The magnitude of the effect of stormwater runoff on phytoplankton dynamics was dependent on the size of each storm and subsequent residence time of runoff within the bay. Rain events led to increases in primary productivity, phytoplankton biomass, and specifically, increases in diatom biomass, as measured by concentrations of biogenic silica. |
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