Dual-polarization radar observation based method for improving thunderstorm weather warning and forecasting accuracy

Abstract

The invention belongs to the field of radar observation based weather forecasting and discloses a dual-polarization radar observation based method for improving thunderstorm weather warning and forecasting accuracy. X waveband dual-polarization weather radar parameters are utilized. On the basis of quality control on data including phase defolding, filtering and attenuation correction and based ona fuzzy logic algorithm, environment temperature limits of sounding data are introduced for identification of multiple hydrometeors in a thunderstorm body. Comparatively detailed analysis is performed on evolution characteristics of the hydrometeors in clouds in two aspects including horizontal distribution and perpendicular distribution during a typical thunderstorm body development process according to an inversion result. Finally, a micro-physical concept model during the thunderstorm body evolution process is established and the structure and the evolution features of the thunderstorm body are acquired. The method provided by the invention facilitates recognition of hydrometeor distribution and a microphysical process in the typical thunderstorm body and provides a quantitative and direct technical support for thunderstorm weather warning and forecasting.

Description

technical field [0001] The invention belongs to the field of radar weather observation, and in particular relates to a method for improving the accuracy of thunderstorm early warning and forecast based on dual-polarization radar observation. Background technique [0002] Thunderstorms are often caused by local convective systems such as single thunderstorms, multi-cell storms and super thunderstorms, often accompanied by lightning, short-term heavy precipitation, hail and strong winds, which bring a lot of inconvenience to human production and life. It also often causes great losses to the economic development of the society. Among them, the thunderstorm cell is the basis of thunderstorm weather. For example, a multi-cell storm is a strong thunderstorm system composed of thunderstorm cells in different development stages arranged in a row, and the circulation system is consistent. The dual linear polarization weather radar can alternately (or simultaneously) transmit and re...

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Problems solved by technology

[0003] The problem existing in the existing technology is: due to the lack of sufficient and systematic comparative analysis, the existing technology still lacks an effective filtering method for thunderstorm cells to eliminate the backward differential propagation phase shift caused by non-Rayleigh scattering, which will cause radar observation quality. Not high; there is a lack of a perfect identification method for individual thunderstorm particles. It is mainly based on dual-linear polarization weather radar to classify and identify aquatic particles in thunderstorm clouds with strong signal attenuation in the heyday, and it does not focus on the entire development process of thunderstorms. The research on the evolution characteristics of aquatic matter particles, and the lack of detailed quantitative research, makes the microphysical process of thunderstorm cells not well understood, and the microphysical conceptual model of each stage of thunderstorm cells is not given, which directly affects the understanding of Early warning and forecast ability of disastrous thunderstorm weather

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