To investigate the microphysical characteristics and differences of precipitation in the Fujian coastal plain and mountainous areas,raindrop size distributions at two different sites(plain site:Jinjiang,mountain site:Jiuxianshan)are analyzed and compared from the perspectives of the entire statistics,various rain intensities,and different rain types using laser disdrometer measurements from 2018 to 2022.Additionally,applicative empirical relations between radar quantities(including simple-polarization and dual-polarization variables)and rain rate are presented.Results indicate that the number concentrations of small raindrops(diameter(D)＜1 mm)and large raindrops(D≥3 mm)at the mountain site are significantly higher than that at the plain site,while the number concentration of medium raindrops(1 ≤ D＜3 mm)at the plain site is slightly higher than that at the mountain site.As the rain rate increases,the number concentration of small raindrops exhibits a variation trend of"increase first,then decrease,and increase again",while the number concentration of medium-to-large raindrops continuously increases.Overall,the mountain site has a smaller mass-weighted mean diameter(Dm)and a larger normalized intercept parameter(lgNw)than the plain site.For the spectral shape(μ)and slope(Λ)parameters,the plain site has a larger Λ than the mountain site when under the same μ,implying a rapid decrease of raindrop number concentration as the diameter increases.Actual radar data are used to verify the effect of the improved empirical relations of reflectivity factor(Z)-rain rate(R)and differential phase shift rate(KDP)-rain rate(R).Validation shows that the performances of the proposed empirical relations are better than that of the traditional relations.
关键词
雨滴谱/山地和平原/经验关系/雷达定量降水估测
Key words
Raindrop size distribution/Mountain and plain sites/Empirical relations/Radar quantitative precipitation estimation
维普
万方数据