Analysis on Characteristics of the Raindrop Size Distribution Between Tropical Cyclone Rainstorm and Warm-Sector Rainstorm in Beibu Gulf Coast
This paper comparatively analyzes the structure characteristics and differences of raindrop size distribution between tropical cyclone rainstorms(TCRs)and warm-sector rainstorms(WSRs)by using the raindrop spectrum observation data from Beihai and Fangchenggang during 2019-2021.The results show that TCRs have higher concentrations of small raindrops and lower concentrations of mid-size and large raindrops than those in WSRs.Compared to the raindrops in WSRs,the raindrop diameters in TCRs are smaller,the particle size distribution is more concentrated and number concentration is higher.The raindrop diameters of WSRs are large,but the particle size distribution is discrete and the drop num-ber concentration is lower.Precipitation in TCRs is dominantly contributed by mid-size and small rain-drops,but by mid-size and large raindrops in WSRs.The contributions of mid-size raindrops in the two are stable,both exceeding 68％.For stratiform precipitation,WSRs have larger variability of rain drop size dis-tribution and more concentrated distribution of raindrop number concentration than TCRs.In convective precipitation,however,WSRs have larger variability of rain drop size distribution and more discrete distri-bution of raindrop number concentration.The convective precipitation of TCRs has obvious characteristics of marine convective rainfall,while the convective precipitation in WSRs is more similar to the continental convective rainfall.The Z-R fitted relationship for convective(stratiform)precipitations in TCRs is Z=155.27R1.54(Z=223.92R1.35),and it is found to be Z=241.55R1.48(Z=331.44R1.34)for convective(stratiform)precipitations in WSRs.In general,the new generation Doppler weather radar has a better effect in estimating rainfall in WSRs than in TCRs.
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