Abstract

Recent radiative transfer models show that: (1) regardless of elastic lidar receiver field of view (FOV), at vanishing lidar depth the lidar-derived attenuation coefficient k _lidar → a, where a is the total absorption coefficient per meter of depth; and (2) for a wide FOV as the lidar sensing depth approaches some large value (depending on water type), k _lidar → K _d, where K _d is the diffuse attenuation for downwelling irradiance. As a result, it is shown that a time-resolved, dual-wavelength-laser, elastic-backscattering lidar can retrieve the three principal oceanic optical properties: (1) the absorption coefficient of phytoplankton a _ph, (2) the absorption coefficient of chromophoric dissolved organic matter (CDOM) a _CDOM, and (3) the nonwater total constituent backscattering coefficient b _bt. The lidar-retrieved a _ph, a _CDOM, and b _bt inherent optical properties can be used to validate corresponding satellite-derived products such as those from terra moderate-resolution imaging spectroradiometer (MODIS), Aqua MODIS, Sea-viewing Wide Field-of-view Sensor, (SeaWiFS), and other ocean color sensors.

© 2003 Optical Society of America

Oceanic inherent optical properties: proposed single laser lidar and retrieval theory

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