Statistical Characteristics of Summer Season Raindrop Size Distribution in the Western and Central Tianshan Mountains in China

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  • ZENG Yong
    Institute of Desert Meteorology, China Meteorological Administration, Urumqi, China Field Scientific Observation Base of Cloud Precipitation Physics in West Tianshan Mountains, China Xinjiang Cloud Precipitation Physics and Cloud Water Resources Development Laboratory, China
  • YANG Lianmei
    Institute of Desert Meteorology, China Meteorological Administration, Urumqi, China Field Scientific Observation Base of Cloud Precipitation Physics in West Tianshan Mountains, China Xinjiang Cloud Precipitation Physics and Cloud Water Resources Development Laboratory, China
  • ZHOU Yushu
    Laboratory of Cloud-Precipitation Physics and Severe Storms, Institute of Atmospheric Physics, Chinese Academy of Sciences, China College of Earth Science, University of Chinese Academy of Sciences, China
  • TONG Zepeng
    Institute of Desert Meteorology, China Meteorological Administration, Urumqi, China Field Scientific Observation Base of Cloud Precipitation Physics in West Tianshan Mountains, China Xinjiang Cloud Precipitation Physics and Cloud Water Resources Development Laboratory, China
  • JIANG Yufei
    Institute of Desert Meteorology, China Meteorological Administration, Urumqi, China Field Scientific Observation Base of Cloud Precipitation Physics in West Tianshan Mountains, China Xinjiang Cloud Precipitation Physics and Cloud Water Resources Development Laboratory, China

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  • 中国天山山脈西部および中部における夏季の雨滴粒径分布の統計的特性

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<p>The characteristics of the raindrop size distribution (DSD) in summer in the western (Nilek) and central (Urumqi) regions in the Tianshan Mountains of China were studied based on three years of second-generation Particle Size Velocity (Parsivel2) disdrometer data. The FengYun-2G satellite remote sensing data and the ERA5 reanalysis product were used to reveal the possible thermo-dynamical and microphysical processes that caused the dissimilarities in DSD between Urumqi and Nilek. The DSD in Nilek is significantly different from that in Urumqi. The concentration of mid- and large-size drops is higher in Nilek than in Urumqi. The DSD characteristics for six rain rate classes and two rain types (convective and stratiform) are studied. It is found that the raindrops in Nilek have overall higher mass-weighted mean diameters (Dm) and lower logarithm of normalized intercept parameters (log10 Nw) than those in Urumqi, which is true for different rain rates and rain types. Convective clusters in Urumqi are similar to maritime clusters, whereas those in Nilek are more similar to continental clusters, according to a classification standard of convective clusters. The radar reflectivity, rain rate relations, and the shape and slope relations for rainfall in Urumqi and Nilek are also different. The DSD variability in the two regions may be attributed to differences in convective intensity that are closely related to the specific terrain of the Tianshan Mountains.</p>

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