An NIBC/Nystrom/SMCG Method Implemented with MoM for Broadband Emissivities from Large-scale Polar Ocean Surfaces

Abstract

In order to address the issues of the high accuracy requirement and computational consumption in numerical simulations of ocean emissivity, a new method is proposed by merging the Nystrom method, the neighborhood impedance boundary condition (NIBC), as well as the sparse matrix canonical grid (SMCG) method. The new approach is used to solve the dual surface integral equations (SIE) and calculate the ocean emissivity. It is validated against the developed Nystrom/NIBC method and shown it has the properties of high precision, fast operation and memory saving. We then use it to calculate the broadband emissivities of large-scale polar ocean. Simulation results are illustrated for 0.5–2GHz and show that the energy conservations are obeyed to 10−4, which meet the accuracy requirement of retrieving polar ocean salinity within 0.2psu. The effects of roughness and SSS on ocean emissivity are also investigated.