Statistical Characteristics of Raindrop Size Distributions and Parameters in Central China During the Meiyu Seasons

Zhikang Fu, Xiquan Dong, Lingli Zhou, Wenjun Cui, Jingyu Wang, Rong Wan, Liang Leng, Baike Xi

Research output: Contribution to journalArticlepeer-review

Abstract

The rain parameters derived from the laser OTT second-generation Particle Size Velocity (Parsivel2), the two-dimensional video disdrometer (2DVD), and DZZ5 tipping-bucket rain gauge (RG) during the Integrative Monsoon Frontal Rainfall Experiment (IMFRE) in summer 2018 are compared. The total rainfall amounts observed by Parsivel, 2DVD, and RG during IMFRE were 178.07, 176.76, and 182.5 mm, while their total rainy hours were 113, 113, and 90. The mean Dm (mass-weighted mean diameter) and LWC (liquid water content) values derived from Parsivel and 2DVD were 1.03 and 1.01 mm and 0.247 and 0.223 g m−3. The rainy samples from six Parsivel sites over the middle reaches of the Yangtze River during the 2016–2018 Meiyu seasons have been collected and analyzed. The occurrence frequencies for rain rates (RR) < 5 and >10 mm hr−1 were 83.9% and 7.4%, respectively, but they contributed 30.5% and 52.1% of the total accumulated rainfall. Compared with the results over the lower reaches of the Yangtze River, the total accumulated rainfall percentages for RR < 5 mm hr−1 and RR > 10 mm hr−1 observed at XN site were higher and lower, respectively. The stratiform rain (SR) raindrop size increases with RR over both the middle and lower reaches, whereas the Nw values over the middle reaches are much higher. Opposite to the SR results, the convective rain (CR) raindrops from this study are larger, while their Nw values are similar to one another. For gamma-type-size distribution, the μ − λ and Z − R relations are strongly dependent on geographical location.

Original languageEnglish (US)
Article numbere2019JD031954
JournalJournal of Geophysical Research: Atmospheres
Volume125
Issue number19
DOIs
StatePublished - Oct 16 2020

Keywords

  • 2DVD
  • DSD distribution
  • Meiyu
  • middle reaches of Yangtze River
  • Parsivel
  • Z-R relation

ASJC Scopus subject areas

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

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