ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Distribution and Dual Polarization Radar Statistical Characteristics of Two Types of Short-time Heavy Rainfall in Suizhou During Summer
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Abstract:
Using conventional observation data and Suizhou S-band dual polarization weather radar observation data, short-time heavy rain is classified into strong weather scale system forcing type (referred to as "strong forcing type") and weak weather scale system forcing type (referred to as "weak forcing type") according to the weather circulation pattern. The distribution characteristics and dual polarization radar echo characteristics of the two types are compared and analyzed.The results show that:(1)Strong forcing type have more occurrences, wider ranges, more stations, and longer durations.(2)In the strong forcing type, July has the highest frequency, followed by June, and the lowest in August. Dahong Mountain and Tongbai Mountain being the most frequent areas.The daily variation characteristics show a three peak distribution, with the highest occurrence occurring from 05:00 to 08:00, followed by 23:00 to 00:00, and the third occurring around 15:00. In the weak forcing type, the frequency of occurrence is basically the same in July and August, with the least in June. The distribution of high-frequency areas is scattered, but mountainous areas are still high-frequency areas. The daily variation follows a unimodal distribution, with the peak occurring at 15:00.(3)Both two types have the characteristics of higher rainfall intensity, stronger echo intensity, higher concentration of liquid particles, higher echo top, larger diameter of liquid particles. (4)In the same rainfall intensity level, there is no significant difference in the combined combined reflectivity(CR), 1 km horizontal reflectivity(Zh), and echo top height (ET) of two types of short-term heavy precipitation, and they all have low centroid characteristics, with the strong forcing type having more obvious low centroid characteristics. However, the interval and average values of the 1 km differential reflectivity(Zdr) and specific differential phase (Kdp) for the strong forcing type are significantly smaller than those for the weak forcing type, while the interval and average values of the 1 km correlation coefficient(CC) are slightly larger than those for the weak forcing type. This indicates that the weak forcing type has larger particle diameters in the lower layers and is more prone to incomplete melting of ice phase particles in the lower layers.
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