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Raindrop size distribution measurements on the Southeast Tibetan Plateau during the STEP project
Atmospheric Research ( IF 5.5 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.atmosres.2020.105311
Gaili Wang , Renran Zhou , Suolang Zhaxi , Shengnan Liu

Abstract As part of the Second Tibetan Plateau Scientific Expedition and Research (STEP) field campaign, raindrop size distribution (DSD) measurements were conducted with a laser optical particle size velocity disdrometer in Motuo on the Tibetan Plateau (TP). The DSD characteristics of five different rain rate classes and convective and stratiform precipitation types were studied using the DSD data from July to September 2019, comprising a total of 47,774 1-min raindrop spectra. The average raindrop spectral width and number concentration of large drops increased with the rainfall intensity. Furthermore, the combination of small- and midsize drops dominated the precipitation in Motuo, and their contributions exceeded 99% of the number concentration. The convective precipitation in Motuo was identified as maritime-like precipitation and was characterized by a large normalized intercept parameter log10Nw = 4.0–4.4 and small mass-weighted mean diameter Dm = 1.1–1.4 mm. Empirical relations among the three parameters (intercept N0, shape μ, and slope Λ) of the gamma distribution model, Nw and Dm of the normalized gamma distribution were derived. We also obtained power-law relationships of Z = ARb for the stratiform and convective precipitation in Motuo, and the empirical relation of Z = 300R1.4 significantly underestimated the convective precipitation in Motuo. When the precipitation type transitioned from stratiform into convective precipitation, coefficient A decreased and exponent b increased. Finally, empirical relations between Dm and the radar equivalent reflectivity factor at the Ku and Ka bands were obtained to improve the rainfall retrieval algorithms of the dual-frequency precipitation radar on the southeast TP.

中文翻译:

STEP项目期间青藏高原东南部雨滴大小分布测量

摘要 作为第二次青藏高原科学考察与研究(STEP)野外活动的一部分,在青藏高原(TP)墨脱地区使用激光光学粒度速度分布仪进行了雨滴粒径分布(DSD)测量。使用 2019 年 7 月至 9 月的 DSD 数据研究了五种不同降雨率等级和对流和层状降水类型的 DSD 特征,包括总共 47,774 个 1 分钟雨滴谱。大雨滴的平均雨滴谱宽度和数量浓度随着降雨强度的增加而增加。此外,中小水滴的组合在墨脱降水中占主导地位,其贡献超过数浓度的99%。墨脱的对流降水被确定为类似海洋的降水,其特征是归一化截距参数 log10Nw = 4.0-4.4 大,质量加权平均直径 Dm = 1.1-1.4 mm。推导出γ分布模型的三个参数(截距N0、形状μ和斜率Λ)与归一化γ分布的Nw和Dm之间的经验关系。我们还得到了墨脱的层状降水和对流降水的Z=ARb的幂律关系,Z=300R1.4的经验关系显着低估了墨脱的对流降水。当降水类型由层状降水转变为对流降水时,系数A减小,指数b增大。最后,
更新日期:2021-02-01
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