| In this paper, first 8mm wavelength cloud radar-HMBQ with Doppler and depolarization capability in China is introduced and disscused including the system calibration and its detecting capability. This HMBQ radar is used to observe cloud in field experiment. Some examples are showed and some primary application in retrieving cloud micropgysical parameters are also presented in the paper. The main contents and conclusions are as follows:(1) The status about cloud radar in and abroad about radars'technology and application on clouds'micro and macrophysics research are introduced as well as the airports safe flight. Three kinds of radars of millimeter-wavelength radar, S-band weather radar and wind profile radar are compared to revealed cloud radar has following superiorities in observing clouds: a) strong capability in detecting small particles like cloud, fog and dust; b) better resolution and precision of Doppler velocity; c) high special resolution result from its narrow beamwidth.. Also present is a prospect on millimeter-wavelength radar.(2) A radar operating at 35-GHz was designed and assembled primarily for observation of clouds and precipitation by the State Key Laboratory of Severe Weather (LaSW) of CAMS (Chinese Academy of Meteorological Sciences) in 2006.This is the first millimeter-wavelength radar with polarization and Doppler capability used for clouds research in China. The parameters and characteristics of the system of this new generation of millimeter-wavelength cloud radar (HMBQ). In another way, the results of this radar's calibration are detailed, too. This radar can detect as low as -40dBz cloud far way from 10 kilometers.(3) During May to September, 2008, This HMBQ radar was arranged in Dongguan, Guangdong Province for the SCHeREX (Southeast China Heavy Rainfall Experiment) and the THOPREX experiment. Different types of cloud (like cumulus humulis, stratiform cloud, altocumulus, nimbo stratus and stratocumulus cloud) have been measured and disscused. In another way, the HMBQ data and China new generation s-band weather radar data are compared to test cloud radar's capability. The result showes that HMBQ radar has high spatio-temporal resolution. It can get much more detailed structure of different cloud and the development of these clouds.(4) Apply HMBQ radar in studying the microphysical and dynamical processing of clouds surrounding Typhoon, especially for those particles before precipitating. The vertical profiles of radar reflectivity and linear depolarization ratio can obviously reveal the particles'phase including their processing from ice to water, and small change of the vertical velocity. The vertical profiles of velocity and velocity spectrum width showed that microphysical structure very well matched the fall speed of precipitating particles.(5) Based on the assumptions of Gamma and Lognormal dropsize distribution and the classic Z-LWC and Z-IWC relationship, cloud liquid water content and cloud ice water content were retrieved by HMBQ radar, as well as cloud phase classification. Some primary results were given with using the field experiment data during May to August, 2008.(6) Compared to China new generation s-band Doppler weather radar data simultaneously, a weak precipitation data surrounding Typhoon'Nuri'was maken for the attenuation correction. Vertical profiles of different time before and after correction were given. The author hopes this test will help the development of cloud radar attenuation correction method. |
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