Analysis and Modeling of Radar Surface Signatures of Non-Linear Internal Waves
WASHINGTON UNIV SEATTLE APPLIED PHYSICS LAB
Pagination or Media Count:
The scientific objectives of this research are 1 to understand the transition from the linear perturbations of surface waves by internal waves studied in the past to the non-linear perturbations embodied by wave breaking, 2 to determine the conditions that make microwave surface signatures of internal waves visible, and 3 to understand better the generation, propagation, and dissipation of internal waves on the ocean Our approach is to utilize the data collected in the first three years of the NLIWI project to determine the characteristics of internal wave signatures, model the expected changes in surface waves caused by internal waves, predict the resulting microwave backscatter, and, finally, compare the modeled backscatter with that observed. The available data include those from satellite, aircraft, and ships at a variety of incidence angles and copolarizations. For the shipboard data, coincident and collocated subsurface velocities and winds are available for the airborne data, this is also nearly the case for the satellite data, it is not the case. Our modeling effort centers on the conservation of wave action for waves longer than about one meter, augmented by a breaking model at shorter wavelengths. Our main concern is to understand for what incidence angles and polarizations breaking wave effects become important in microwave internal wave signatures.
- Physical and Dynamic Oceanography
- Active and Passive Radar Detection and Equipment
- Fluid Mechanics