A Method of Retrieving Thunderstorm Charge Distribution Using Dual Polarization Doppler Weather Radar Echoes

Abstract

The invention discloses an inversion method of thunderstorm charge distribution by means of dual-polarization Doppler weather radar echo. The inversion method of thunderstorm charge distribution by means of dual-polarization Doppler weather radar echo includes the steps: establishing the mapping relation between a dual-polarization Doppler weather radar echo parameter and a hydrometeor particle charge sensitive factor; and according to the mapping relation, converting the radar echo parameter information, such as the reflectivity factor, the Doppler velocity, the spectral width, the hydrometeor particle type and the height, into the related parameters, such as the hydrometeor particle type required by a hydrometeor particle charge parameterization scheme, bringing the result after conversion to the hydrometeor particle charge parameterization scheme, calculating the charge amount of each echo data point, point by point, and realizing inversion of thunderstorm charge distribution. The inversion method of thunderstorm charge distribution by means of dual-polarization Doppler weather radar echo integrates the electrification theory of thunderstorm, the charge structure model and the dual-polarization Doppler weather radar detection technology into one body to realize detection of thunderstorm charge distribution by means of the dual-polarization Doppler weather radar, thus being able to improve the monitoring capability of the dual-polarization Doppler weather radar for thunderstorm.

Description

technical field [0001] The invention relates to a method for retrieving the distribution of thunderstorm charges by using dual-polarization Doppler weather radar echoes. Background technique [0002] Effective monitoring and forecasting of lightning activities is conducive to reducing disaster losses caused by lightning. For this reason, research on lightning monitoring and forecasting methods has never stopped. The characteristics of lightning activities are closely related to the charge distribution of thunderstorms. Studying the charge distribution in thunderstorm clouds is an important way to reveal the development law of thunderstorms, and can also provide a theoretical basis for lightning monitoring and early warning, and artificial lightning induction. Therefore, studying the charge distribution of thunderstorm clouds has important Very important theoretical significance and application value. [0003] The detection of thunderstorm charge structure is mainly to use s...

AI Technical Summary

Problems solved by technology

The use of sounding balloons for electric field sounding plays an irreplaceable role in the study of thunderstorm charge structure, but there are at least the following problems that need to be further improved or solved in the existing detection methods: (1) The timeliness of detection, the sounding balloon Carrying an electric field radiosonde for sounding is the most commonly used method, but due to the limitation of the speed of the sounding balloon, it takes about 20 minutes for the radiosonde to enter the bottom of the thunderstorm cloud and reach the top of the thunderstorm cloud. The development speed of the thunderstorm is relatively fast, and there will be great changes in the charge structure of the thunderstorm cloud during the rising period of the radiosonde, and the detection results of the radiosonde cannot really reflect the distribution of the thunderstorm charge; During the ascent process from the bottom to the top of the cloud, affected by the horizontal wind, its trajectory cannot be controlled. The measurement result is not necessarily the value of the predetermined measurement area, and the measured value is only the value within the trajectory of the sounding balloon, which does not reflect the entire The charge distribution in the thunderstorm area; (3) The time and place selection problem of detection. The thunderstorm must appear in the place with the detection conditions before the sounding measurement can be carried out. information; in addition, the method of using sounding balloons for electric field sounding still has the problem of low cost-effectiveness, which requires a lot of manpower and material resources for guarantee, making it difficult to carry out business promotion of thunderstorm electric field sounding

In addition, the spin-up time of a numerical weather prediction model that includes a complete weather process generally takes 3 to 6 hours, while the life history of a general thunderstorm cloud is less than 3 hours, so it is very difficult to use numerical models to predict the charge structure of thunderstorms

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