Vertical Distributions of Raindrops and Z-R Relationships Using Microrain Radar and 2-D-Video Distrometer Measurements During the Integrative Monsoon Frontal Rainfall Experiment (IMFRE)

Lingli Zhou, Xiquan Dong, Zhikang Fu, Bin Wang, Liang Leng, Baike Xi, Chunguang Cui

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

The vertical characteristics of raindrop size distributions (DSD) and Z-R relationships for monsoon frontal rainfall have been investigated using the co-located two-dimensional video disdrometer and micro rain radar at the Xianning surface site, and the S-band weather radar at the Wuhan radar site during the Integrative Monsoon Frontal Rainfall Experiment (IMFRE). In this study, a total of 1,896 rain samples (1-min resolution) were collected and classified into three categories of convective rain (CR), stratiform rain (SR), and light rain (LR), and their corresponding rain microphysical properties were explored. The LR category is dominated by the evaporation of smaller raindrops and the break-up processes of larger raindrops, resulting in decreasing trends in radar reflectivity and rain rate as the raindrops fall. The SR category undergoes a competition of break-up and coalescence processes, with weak increases in radar reflectivity and rain rate. Whereas, for the CR category, the coalescence process is dominant on the falling path of raindrops, especially below 1 km, leading to sharp increases in radar reflectivity and rain rate. The microrain radar data at height of 200 m is quantitatively compared with the two-dimensional video disdrometer data, and a good agreement is found between them. Further, the number concentrations of raindrops are negatively correlated with the diameters of raindrops and discrepant significantly at different heights among the three rain categories. The height-dependent Z-R relationships found for LR, SR, and CR categories will provide insightful information for improving radar rainfall estimate of monsoon frontal rainfall over central China in the future.

Original languageEnglish (US)
Article numbere2019JD031108
JournalJournal of Geophysical Research: Atmospheres
Volume125
Issue number3
DOIs
StatePublished - Feb 16 2020

Keywords

  • 2-D-video distrometer
  • Z-R relationship
  • drop size distribution
  • microrain radar
  • monsoon frontal rainfall
  • raindrop formation process

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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