Microphysical characteristics and types of precipitation for different seasons over North Taiwan

Meng Tze Lee, Pay Liam Lin, Wei Yu Chang, Balaji Kumar Seela, Jayalakshmi Janapati

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


In this work, long-term (10 years) raindrop size distribution (RSD) measurements from the Joss–Waldvogel Disdrometer (JWD) installed at the National Central University (NCU) (24°58′6″N, 121°11′27″E), Taiwan, and the vertical profile of radar reflectivity were used to analyze the variations in the gamma parameters of six seasons (winter, spring, mei-yu, summer, typhoon, and autumn) and types of precipitation. The normalized gamma distribution of RSD revealed that the highest mean Dm (mass-weighted average diameter) values occurred in the summer, whereas the highest mean log10 Nw (normalized intercept parameter) values were found in the winter. Furthermore, most of the rain falling at a rate of less than 20 mm h−1 occurs in Northern Taiwan. In this study, we used radar reflectivity to differentiate between convective and stratiform systems. It was revealed that the mean Dm values are higher in convective systems, whereas the mean log10 Nw values are higher in stratiform systems. The structure of RSD in stratiform systems remains constant in all seasons; however, convection is similarto maritime type. The microphysical characteristics that are responsible for the different RSD features in different seasons and types of precipitation are illustrated with the help of contoured frequency by altitude diagrams of radar reflectivity.

Original languageEnglish
Pages (from-to)841-865
Number of pages25
JournalJournal of the Meteorological Society of Japan
Issue number4
StatePublished - 2019


  • Radar reflectivit
  • Rain rate
  • Raindrop size distribution


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