Extending Coastal Zone Color Scanner estimates of the diffuse attenuation coefficient into Case II waters

Richard W. Gould Jr.; Robert A. Arnone

doi:10.1117/12.190077

26 October 1994 Extending Coastal Zone Color Scanner estimates of the diffuse attenuation coefficient into Case II waters

Richard W. Gould Jr., Robert A. Arnone

Author Affiliations +

Proceedings Volume 2258, Ocean Optics XII; (1994) https://doi.org/10.1117/12.190077
Event: Ocean Optics XII, 1994, Bergen, Norway

Abstract

An iterative technique has been developed to improve coastal zone color scanner (CZCS) estimates of upwelled subsurface water radiances (L_u) in Case II waters. Regional relationships between the diffuse attenuation coefficient measured at 490 nm (K490) and L_u measured at 443, 520, and 550 nm were developed using data collected in the northern Gulf of Mexico in April 1993. These relationships are used to iteratively adjust the aerosol contribution to the total radiance measured at the sensor. The open-ocean assumption that there is no water-leaving radiance at 670 nm is not valid in coastal areas with a high sediment load. If the sediment signal is not considered the aerosol contribution is overestimated during the atmospheric correction of the CZCS data. Subsequently, the calculations of L_u are underestimated, even to the point of negative radiances calculated in extremely turbid areas. Because the L_u are used in the geophysical algorithms to estimate K490 and pigment concentration, these derived products are overestimated in Case II waters if the 670 nm radiance is not partitioned into aerosol and sediment components.

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Richard W. Gould Jr. and Robert A. Arnone "Extending Coastal Zone Color Scanner estimates of the diffuse attenuation coefficient into Case II waters", Proc. SPIE 2258, Ocean Optics XII, (26 October 1994); https://doi.org/10.1117/12.190077

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