Abstract
During the passage of Typhoon Nida, the raindrop size distribution parameters, the raindrop spectra, the shape and slope (μ–Λ) relationship, the radar reflectivity factor, and rain rate (Z–R) relationship were investigated based on a two-dimensional (2D) video disdrometer in Guangdong, China, from August 1 to 2, 2016. Due to the underlying surface difference between the ocean and land, this process was divided into two distinct periods (before landfall and after landfall). The characteristics of raindrop size distribution between the period before landfall and the period after landfall were quite distinct. The period after landfall exhibited higher concentrations of each size bin (particularly small drops) and wider raindrop spectral width than the period before landfall. Compared with the period before landfall, the period after landfall had a higher average mass-weighted mean diameter Dm that was smaller than those of other TCs from the same ocean (the Pacific). The μ–Λ relationship and Z–R relationship in this study were also compared with other TCs from the same ocean (the Pacific). This investigation of the microphysical characteristics of Typhoon Nida before landfall and after landfall may improve radar quantitative precipitation estimation (QPE) products and microphysical schemes by providing useful information.
Highlights
Tropical cyclones (TCs) usually bring heavy precipitation, strong winds, lightning strikes, and storm surge, which cause economic loss and endanger human security
Even though many scientists have investigated the DSDs of TC systems, there have been few documented studies in southern China and still fewer focusing on the difference between DSDs before landfall and after landfall over southern China. erefore, on the basis of microphysical information provided by 2D video disdrometer (2DVD), this study reported the differences between DSD characteristics in Typhoon Nida before landfall and after landfall in southern China
We examined the DSD characteristics of different rain rate classes before landfall and after landfall. e precipitation particles mainly consist of the drops of R
Summary
Tropical cyclones (TCs) usually bring heavy precipitation, strong winds, lightning strikes, and storm surge, which cause economic loss and endanger human security. Raupach and Berne [13] indicated that methods using the DSD parameters measured by a Parsivel disdrometer should be corrected using a 2DVD as a reference instrument. Chang et al [26] focused on different rain types and implied that the DSDs of TCs over the ocean were mainly maritime-like convection, while those over land fell between continental-like and maritime-like convection, as defined by Bringi et al [4]. Other studies [31,32,33,34,35] focused on the differences in the DSD characteristics of the inner core (eyewall) and outer rainbands. Erefore, on the basis of microphysical information provided by 2DVD, this study reported the differences between DSD characteristics in Typhoon Nida before landfall and after landfall in southern China Even though many scientists have investigated the DSDs of TC systems, there have been few documented studies in southern China and still fewer focusing on the difference between DSDs before landfall and after landfall over southern China. erefore, on the basis of microphysical information provided by 2DVD, this study reported the differences between DSD characteristics in Typhoon Nida before landfall and after landfall in southern China
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