Algorithms for Aerosol Correction Based on a Combination of OCTS and POLDER

概要

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A better atmospheric correction for space-based data given by the second generation of ocean color sensors, e.g. ADEOS/OCTS and POLDER, is the main aim of this work. The new sensors possess high radiometric sensitivity and multi-channels in the visible and near-infrared wavelengths. This paper focuses on retrieval algorithms for atmospheric aerosols using both radiance and polarization data. It is shown first that a heterogeneous aerosol model following the Maxwell-Garnett mixing rule with small water-soluble inclusions in an oceanic matrix is available to interpret both the OCTS and POLDER data in the near infrared wavelength. Then an atmospheric correction process, which is based on the radiative transfer process in an atmosphere-ocean model involving the retrieved aerosol models, is applied to the ocean color data in the visible spectrum. Finally our procedure provides the phytoplankton pigment concentration near the sea surface defined as an expected map of the normalized difference phytoplankton index (NDPI). We would like to emphasize that the aerosol retrieval is improved by a combination of radiance and polarization data. In addition, it is of interest to mention that both of the NDPI maps obtained from OCTS and POLDER show the seasonal flow pattern of the currents over the North Pacific Ocean near Japan on April 26 in 1997.
近畿大学の論文
1999-02-28