J9.4 A Study on the Climatological Characteristics of DSD between Spring and Autumn Season in Korea

Thursday, 26 January 2017: 8:45 AM
602 (Washington State Convention Center )
Byoung-Geun Seol, Pukyong National University, Busan, Korea, Republic of (South); and D. I. Lee, S. H. Suh, D. K. Kim, and D. H. Ha

Raindrop size distribution (DSD) is controlled by the microphysical processes of rainfall and atmospheric conditions. Also, DSD provides the important information for the microphysical structure of rainfall and describes the statistical distribution of raindrop size and number concentration. DSD data precisely reflects local rainfall characteristics within an observation area (You et al., 2014). Therefore, it is important to understand about DSD characteristics.

In this study, the characteristics of raindrop size distribution (DSD) in Miryang, Korea (35.50°N, 128.74°E), were investigated by using ground truth data, PARticle SIze VELocity (PARSIVEL) from two different sites (D1, D2) from 18th June 2015 to 7thJune 2016. The site of D1(34.543°N, 128.643°E) is located in inland region and D2(35.404°N, 128.774°E) is located in relatively onshore region compared with D1. To analyze the climatological DSD characteristics, the rainfall data has been categorized in 8 different types.

According to Bringi et al. (2003), the mass weighted median diameter (Dm) is proportional to the rainfall intensity (R) and intensive rainfall systems are dominant in summer season. However, the value of Dm showed the largest value in the autumn season except for the winter season. Furthermore, the value of Dmhas the smallest value in the spring season which has similar atmospheric conditions with autumn season.

Comparing the results between D1 and D2 in the autumn season, the value of Dm was larger in D2. Also, the research about variability of DSD in Busan, Korea has been done in 2002 and 2012 by You and Lee (2015), which is also said that the value of Dmin the autumn shows the largest than other seasons.

The purpose of this study is to find out the reasons of the features for high values of Dm in the spring and autumn season by analyzing PARSIVEL and the conditions of atmosphere in each seasons.

Acknowledgment

This work was funded by the Korea Meteorological Industry Promotion Agency under Grant KMIPA 2015-1050.

This work was financially supported by the BK21 plus Project of the Graduate School of Earth Environmental Hazard System.

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