Numerical Study on the Wind Direction Asymmetries of Fully Polarimetric Ocean Emission at L-Band
- Resource Type
- Conference
- Authors
- Du, Yanlei; Ma, Wentao; Yang, Xiaofeng; Yang, Jian
- Source
- 2021 IEEE International Geoscience and Remote Sensing Symposium IGARSS Geoscience and Remote Sensing Symposium IGARSS , 2021 IEEE International. :7468-7471 Jul, 2021
- Subject
- Aerospace
Geoscience
Photonics and Electrooptics
Signal Processing and Analysis
Stokes parameters
Satellites
Sensitivity
Oceans
Wind speed
Data models
Brightness temperature
Fully polarimetric ocean emission
L-band
Passive remote sensing
Directional wave spectrum
Foam
Aquarius
SMAP
- Language
- ISSN
- 2153-7003
The wind direction asymmetries of the fully polarimetric ocean emissivity at L-band are studied using a semi-theoretical approach. The model is tuned and validated against Aquarius and SMAP observations, which incorporates the two-scale polarimetric ocean emission model, an improved directional wave spectrum, the AG13 foam emissivity model and a novel foam coverage model. Comparisons of model simulations to satellite data show that the overall accuracy of model could reach 0.2 K. The average standard deviations of the differences of polarimetric brightness temperature between observations and model are less than about 0.16 K for wind speeds up to 15 m/s. The negative and positive upwind-crosswind (UC) asymmetries of L-band ocean emission and the transition of the phase signatures in terms of wind speed are well illustrated for all polarizations by the proposed model. The directional variations of L-band brightness temperature for the third Stokes parameter show less sensitivity to wind speed with the increase of observation angles.