POSTER SESSION 4
10:30–12:30, Thursday, September 17
Poster Session | 1 | 2 | 3 | 4 | Schedule at a Glance
ABSTRACT 1314 | POSTER 92
A METHOD FOR COMPUTING REMOTE SENSING REFLECTANCE USING AN OCEAN–ATMOSPHERE SPECTRAL IRRADIANCE MODEL (OASIM)-COUPLED MODEL FOR TOKYO BAY
This study aimed to develop a coupled modeling system for Tokyo Bay, a representative semi-enclosed coastal environment in Japan, by integrating the three-dimensional hydrodynamic–ecosystem model EcoPARI with the atmospheric and underwater radiative transfer model OASIM through the Framework for Aquatic Biogeochemical Models (FABM).
The developed EcoPARI–FABM–OASIM system enables spectrally resolved simulation of broadband solar radiation, including both direct and diffuse components in the atmosphere, while reproducing vertical light propagation in the water column by accounting for absorption and scattering by phytoplankton, colored dissolved organic matter (CDOM), detritus, and inorganic suspended particles.
OASIM employs a two-stream approximation for simulating underwater light fields, in which only downwelling direct irradiance (Ed) and downwelling diffuse irradiance (Es) are solved. As a result, remote sensing reflectance (Rrs), which requires upwelling diffuse irradiance (Eu), cannot be directly estimated. To address this limitation, a scheme was developed to compute Eu after solving Ed and Es, under the assumptions that Eu does not feed back to Ed or Es and that Ed and Es are vertically uniform within each layer. By introducing the conversion factor Q, Rrs can be derived from the simulated irradiance fields.
The validity of the proposed method was confirmed through comparison between modeled Rrs and in situ measurements from AERONET-OC. This framework establishes a basis for future data assimilation of satellite-derived Rrs into biogeochemical models. As a future challenge, a more physically consistent estimation of the conversion factor Q using advanced radiative transfer models is required.
Hiroto Higa, Yokohama National University, [email protected]
Jozef Skákala, Plymouth Marine Laboratory, [email protected]
Salem Salem, Plymouth Marine Laboratory, [email protected]
Poster Session | 1 | 2 | 3 | 4 | Schedule at a Glance
