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Retrieval of raindrop size distribution, vertical air velocity and water vapor attenuation using dual-wavelength doppler radar observations
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Srivastava, C. Heymsfield, Gerald M. Tian, Lin Li, Lihua |
| Copyright Year | 2005 |
| Description | Two techniques for retrieving the slope and intercept parameters of an assumed exponential raindrop size distribution (RSD), vertical air velocity, and attenuation by precipitation and water vapor in light stratiform rain using observations by airborne, nadir looking dual-wavelength (X-band, 3.2 cm and W-band, 3.2 mm) radars are presented. In both techniques, the slope parameter of the RSD and the vertical air velocity are retrieved using only the mean Doppler velocities at the two wavelengths. In the first method, the intercept of the RSD is estimated from the observed reflectivity at the longer wavelength assuming no attenuation at that wavelength. The attenuation of the shorter wavelength radiation by precipitation and water vapor are retrieved using the observed reflectivity at the shorter wavelength. In the second technique, it is assumed that the longer wavelength suffers attenuation only in the melting band. Then, assuming a distribution of water vapor, the melting band attenuation at both wavelengths and the rain attenuation at the shorter wavelength are retrieved. Results of the retrievals are discussed and several physically meaningful results are presented. |
| File Size | 6641787 |
| Page Count | 57 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20050180394 |
| Archival Resource Key | ark:/13960/t21c6z90b |
| Language | English |
| Publisher Date | 2005-03-04 |
| Access Restriction | Open |
| Subject Keyword | Meteorology And Climatology Meteorological Radar Size Distribution Vertical Distribution Raindrops Multispectral Radar Wind Velocity Measurement Atmospheric Moisture Velocity Distribution Water Vapor Drop Size Wavelengths Radar Attenuation Airborne Radar Atmospheric Attenuation Doppler Radar Reflectance Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
