Abstract
Abstract : Secchi data (transparency) were obtained for Southeast Asian and Indonesian waters from 20 deg S to 30 deg N and from 90 deg E to 140 deg E. Some 10,269 points were used to determine the seasonal variation of transparency from specific subregions and depths. Seasonal and annual charts of Secchi depth (Z sub s) were made for 16 subregions. The irradiance attenuation coefficient (K) was computed from z sub s. Charts of Kd, the product of K and water depth, showed that some nearshore areas can be surveyed by laser bathymetry.
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