The effect of seasurface Sun glitter on microwave radiometer measurements
Abstract
A relatively simple model for the microwave brightness temperature of sea surface Sun glitter is presented. The model is an accurate closeform approximation for the fourfold Sun glitter integral. The model computations indicate that Sun glitter contamination of on orbit radiometer measurements is appreciable over a large swath area. For winds near 20 m/s, Sun glitter affects the retrieval of environmental parameters for Sun angles as large as 20 to 25 deg. The model predicted biases in retrieved wind speed and sea surface temperature due to neglecting Sun glitter are consistent with those experimentally observed in SEASAT SMMR retrievals. A least squares retrieval algorithm that uses a combined sea and Sun model function shows the potential of retrieving accurate environmental parameters in the presence of Sun glitter so long as the Sun angles and wind speed are above 5 deg and 2 m/s, respectively.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 November 1981
 Bibcode:
 1981STIN...8226525W
 Keywords:

 Brightness Temperature;
 Glint;
 Microwaves;
 Ocean Surface;
 Solar Position;
 Wind Velocity;
 Algorithms;
 Least Squares Method;
 Mathematical Models;
 Microwave Radiometers;
 Reflection;
 Sea Roughness;
 Solar Radiation;
 Surface Temperature;
 Communications and Radar