Ms. Agnes Valerie Dudek Profile

Agnes Valerie Dudek

at Univ of Strathclyde

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Proceedings Article | 26 February 2004 Paper

Regional validation of SeaDAS algorithms and remote sensing of a complex frontal structure in the southern Irish Sea

Agnes Dudek, Alex Cunningham, David McKee

Proceedings Volume 5233, (2004) https://doi.org/10.1117/12.510484

KEYWORDS: Remote sensing, Signal attenuation, Satellites, Algorithm development, Radiometry, Water, Ocean optics, In situ metrology, Organic materials, Image processing

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In situ measurements of downward irradiance and upward radiance, together with determinations of surface concentrations of chlorophyll, suspended particles and colored dissolved organic material (CDOM) were made at 126 stations during 5 cruises in the Irish and Celtic Seas. Twenty one of these stations provided acceptable match-ups with SeaWiFS ocean color images. Normalized water leaving radiances for the selected stations derived from SeaWiFS data were well correlated with those measured at the sea surface (r² = 0.92). In situ observations from the whole region, which covered a wide range of water types including turbid coastal regions and a coccolithophore bloom, were therefore used to test the performance of SeaDAS algorithms for surface chlorophyll concentration (Chl) and the diffuse attenuation coefficient at 490 nm (K_d490). In general, Chl was over-estimated and K_d490 under-estimated by SeaDAS. However the algorithms performed acceptably in some regions such as St George’s Channel (r² = 0.70 for Chl, r² = 0.74 for K_d490). Examination of SeaWiFS and AVHRR images of this region for July 2002 revealed complex patterns of surface temperature and chlorophyll with a high degree of spatial correlation. The highest chlorophyll concentrations occurred on the stratified side of the Irish/Celtic Sea front.

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