Dr. Florence C. Lahet Profile

Dr. Florence C. Lahet

at Royal Belgian Institute of Natural Sciences

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Proceedings Article | 5 October 2007 Paper

Ocean color remote sensing of turbid plumes in the southern California coastal waters during storm events

Florence Lahet, Dariusz Stramski

Proceedings Volume 6680, 66800U (2007) https://doi.org/10.1117/12.734922

KEYWORDS: MODIS, Satellites, Composites, Water, Spatial resolution, Data centers, Satellite imaging, Remote sensing, Climatology, Image analysis

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Water-leaving radiance data obtained from MODIS-Aqua satellite images at spatial resolution of 250 m (band 1 at 645 nm) and 500 m (band 4 at 555 nm) were used to analyze the correlation between plume area and rainfall during strong storm events in coastal waters of Southern California. Our study is focused on the area between Point Loma and the US-Mexican border in San Diego, which is influenced by terrigenous input of particulate and dissolved materials from San Diego and Tijuana watersheds and non-point sources along the shore. For several events of intense rainstorms that occurred in the winter of 2004-2005, we carried out a correlational analysis between the satellite-derived plume area and rainfall parameters. We examined several rainfall parameters and methods for the estimation of plume area. We identified the optimal threshold values of satellite-derived normalized water-leaving radiances at 645 nm and 555 nm for distinguishing the plume from ambient ocean waters. The satellite-derived plume size showed high correlation with the amount of precipitated water accumulated during storm event over the San Diego and Tijuana watersheds. Our results support the potential of ocean color imagery with relatively high spatial resolution for the study of turbid plumes in the coastal ocean.

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