Preprints
https://doi.org/10.5194/hess-2020-345
https://doi.org/10.5194/hess-2020-345

  21 Aug 2020

21 Aug 2020

Review status: a revised version of this preprint is currently under review for the journal HESS.

Microphysical features of typhoon and non-typhoon rainfall observed in Taiwan, an island in the northwest Pacific

Jayalakshmi Janapati1, Balaji Kumar Seela1, Pay-Liam Lin1,2,3, Meng-Tze Lee4, and Everette Joseph5 Jayalakshmi Janapati et al.
  • 1Institute of Atmospheric Physics, Department of Atmospheric Sciences, National Central University, Zhongli district, Taoyuan city, Taiwan
  • 2Earthquake-Disaster & Risk Evaluation and Management Center, National Central University, Zhongli district, Taoyuan city, Taiwan
  • 3Research Center for Hazard Mitigation and Prevention, National Central University, Zhongli district, Taoyuan City, Taiwan
  • 4Department of Atmospheric and Oceanic Sciences, McGill University, Montreal, Quebec, Canada
  • 5National Center for Atmospheric Research, Boulder, Colorado

Abstract. The microphysical features of the typhoon (TY) and non-typhoon (NTY) rainfall in summer seasons are analyzed using long-term (2004 to 2016) data from the impact disdrometer installed in north Taiwan. The RSD stratified based on rainfall rate showed distinct RSD characteristics between TY and NTY rainfall. More (less) number of small (big) size raindrops are noticed in TY rainfall than NTY rainfall. RSD features in terms of gamma parameters are studied for these two weather regimes. The mass-weighted mean diameter (Dm) values are higher in NTY than TY rainfall, and an inverse behavior is observed for the normalized intercept parameter (Nw). Even after separating the rainfall regimes into convective and stratiform type, a large Dm is found in NTY compared to TY precipitation. Distinct variations in ZR, DmR, NwR, KER, and KEDm relations are noticed between TY and NTY rainfall. Possible mechanisms responsible for the RSD variations between TY and NTY are discussed using reanalysis, remote-sensing, and ground-based radar datasets.

Jayalakshmi Janapati et al.

 
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Jayalakshmi Janapati et al.

Jayalakshmi Janapati et al.

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Short summary
Typhoon (TY) and non-typhoon (NTY) rainy days in north Taiwan summer seasons showed more large drops in NTY than TY rainy days. Relatively higher convective activity and drier conditions in NTY than TY lead to the variations in microphysical characteristics between TY and NTY rainy days. The raindrop size distribution and kinetic energy relations assessed for TY and NTY rainfall can be useful in evaluating the radar rainfall estimation algorithms, cloud modeling, and rainfall erosivity studies.