Accession Number : ADA184204

Title :   A Method for Remote Sensing of Precipitable Water Vapor and Liquid in the Atmosphere Using a 22-GHz Radiometer.

Descriptive Note : Final rept.,

Corporate Author : AEROSPACE CORP EL SEGUNDO CA ELECTRONICS RESEARCH LAB

Personal Author(s) : Shimabukuro,Fred I

PDF Url : ADA184204

Report Date : 03 Aug 1987

Pagination or Media Count : 18

Abstract : Q well known method for retrieving the precipitable water vapor (v) and liquid (l) in a nonprecipitating atmosphere utilizes a dual channel radiometer operating at 20.6 adn 31.6 ghz. Statistical retrieval algorithms are used for the determination of V and L. In this study a somewhat different method for retrieval of the quantities V and L, using a radiometer, is described. The atmospheric opacities are determined at three frequencies, (nu1, nu2,nu3) near the water vapor line, from emission measurements. The frequency nu2 is the line center, and the frequencies, nu1, and nu3 are chosen such that (nu2)sq. = (nu1)sq + (nu3)sq. From these three measurements, a differential opacity which is dependent only on the resonant part of the water vapor absorption is derived. From this quantity, estimates of V and the clear atmosphere attenuation are obtained. The cloud opacity is obtained by subtracting the clear atmosphere attenuation from the total attenuation. In light rain the quantity V can be retrieved using this technique.

Descriptors :   *RADAR MAPPING, *MOISTURE CONTENT, ATMOSPHERIC PRECIPITATION, RADIOMETRY, SUPERHIGH FREQUENCY, REMOTE DETECTORS, WATER VAPOR, DROPS

Subject Categories : Meteorology
      Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE