|
DEVELOPMENT OF AN IMPROVED MICROWAVE OCEAN SURFACE EMISSIVITY RADIATIVE TRANSFER MODEL
|
|
|
|
 |
| Title | DEVELOPMENT OF AN IMPROVED MICROWAVE OCEAN SURFACE EMISSIVITY RADIATIVE TRANSFER MODEL |
| Author | El-Nimri, Salem
|
| Keywords | Ocean Emissivity
Microwave Remote Sensing
Radiometry
Hurricane Observation
HIRAD
SFMR
|
| Abstract | An electromagnetic model is developed for predicting the microwave blackbody emission from the ocean surface over a wide range of frequencies, incidence angles, and wind vector (speed and direction) for both horizontal and vertical polarizations. This ocean surface emissivity model is intended to be incorporated into an oceanic radiative transfer model to be used for microwave radiometric applications including geophysical retrievals over oceans. The model development is based on a collection of published ocean emissivity measurements obtained from satellites, aircraft, field experiments, and laboratory measurements. This dissertation presents the details of methods used in the ocean surface emissivity model development and comparisons with current emissivity models and aircraft radiometric measurements in hurricanes. Especially, this empirically derived ocean emissivity model relates changes in vertical and horizontal polarized ocean microwave brightness temperature measurements over a wide range of observation frequencies and incidence angles to physical roughness changes in the ocean surface, which are the result of the air/sea interaction with surface winds. Of primary importance are the Stepped Frequency Microwave Radiometer (SFMR) brightness temperature measurements from hurricane flights and independent measurements of surface wind speed that are used to define empirical relationships between C-band (4 Â 7 GHz) microwave brightness temperature and surface wind speed. By employing statistical regression techniques, we develop a physical-based ocean emissivity model with empirical coefficients that depends on geophysical parameters, such as wind speed, wind direction, sea surface temperature, and observational parameters, such as electromagnetic frequency, electromagnetic polarization, and incidence angle. |
| Adviser | Jones, W. Linwood
|
| Publisher | University of Central Florida |
| Degree | Ph.D.
|
| Degree Discipline | School of Electrical Engineering and Computer Science
|
| Degree Grantor | Engineering and Computer Science
|
| Degree Program | Electrical Engineering PhD
|
| Graduation Date | 2010-01-01 |
| Type | Doctoral dissertation
|
| Access Level | Public - Allow Worldwide Access
|
| Release Date | 2010-05-07 |
| Repository | University Archives
|
| Repository Collection | Electronic Theses and Dissertations
|
| Identifier | CFE0003085 |
| Access Link | http://purl.fcla.edu/fcla/etd/CFE0003085 |
|
|
|
|
|