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GEOPHYSICAL RESEARCH LETTERS, VOL. 31, L06309, doi:10.1029/2003GL019122, 2004

Covariation of coastal water temperature and microbial pollution at interannual to tidal periods

Alexandria B. Boehm

Department of Civil and Environmental Engineering, Stanford University, Stanford, California, USA


Daniel B. Lluch-Cota

Centro de Investigaciones Biologicas del Noroeste, La Paz, Mexico


Kristen A. Davis

Department of Civil and Environmental Engineering, Stanford University, Stanford, California, USA


Clinton D. Winant

Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California, USA


Stephen G. Monismith

Department of Civil and Environmental Engineering, Stanford University, Stanford, California, USA


Abstract

Water temperature and fecal indicator bacteria levels covary along the shoreline of Huntington and Newport Beach, California at interannual to tidal periods. During summer, cooler than average waters caused by interannual variability in sea surface temperature (SST), synoptic upwelling, and tidal-period cooling are coincident with elevated levels of microbial pollution in the surf zone. This relationship can be explained by the effects of weakening in stratification on the fate of a waste water plume and the prolonged persistence of fecal indicator bacteria in colder waters. During winter, warmer than average water caused by basin scale oscillations and atmospheric and oceanographic processes that contribute to the Multivariate El Nino Southern Oscillation Index are indicative of elevated total coliform levels in the surf zone. The elevated coliform levels can be ascribed to increased rainfall, and the resultant storm water inflow to the surf zone.

Received 20 November 2003; accepted 8 March 2004; published 30 March 2004.

Index Terms: 4251 Oceanography: General: Marine pollution; 4219 Oceanography: General: Continental shelf processes; 4279 Oceanography: General: Upwelling and convergences; 4546 Oceanography: Physical: Nearshore processes.

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Citation: Boehm, A. B., D. B. Lluch-Cota, K. A. Davis, C. D. Winant, and S. G. Monismith (2004), Covariation of coastal water temperature and microbial pollution at interannual to tidal periods, Geophys. Res. Lett., 31, L06309, doi:10.1029/2003GL019122.