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Characteristics of Precipitation Particles Measured by PARSIVEL Disdrometer at a Mountain and a Coastal Site in Korea
Asia-Pacific Journal of Atmospheric Sciences ( IF 2.3 ) Pub Date : 2020-04-14 , DOI: 10.1007/s13143-020-00190-6
Joo Wan Cha , Seong Soo Yum

This study analyzed HC (Hydrometeor Classification), rain rate, and DSD (Drop Size Distribution) observed using an optical disdrometer, parsivel, at a mountain (Daegwallyeong, DG) and a coastal site (Mokpo, MP) over 2 years (2010–2011). The HC accuracies of the drizzle, rain, and snow were about 95%, 87%, and 80% respectively. The R2 (coefficient of determination) of the parsivel with TB (Tipping Bucket) rain gauge was 0.91 at MP and 0.96 at DG. The shapes of drizzle and rain DSD observed at DG and MP were similar while the variation in snow DSD was easily influenced by weather condition such as temperature and wind speed. The relatively warm temperature (–5 °C ∼ -0 °C) increased the snow particle number concentration at around 0.6~1 mm diameter and the relatively cold temperature (–15 °C ∼ -10 °C) decreased it above 2 mm diameter. Although wind speed was not a strong factor in snow DSD, larger particles were apt to form in relatively strong wind conditions. Due to different wind directions for the maritime and continental regions, snow particle number density (N(D)) at MP and DG exhibited large differences in terms of snow DSD shape and the number concentration. For instance, in the maritime precipitation, snow DSD shape at MP was broader than that at DG and small-size snow particles were observed at DG more frequently than at MP. In addition, camera-observed snow particle type measurement was carried out at DG in January to March 2010. During the measurement at DG, a mixed type of plate and column was the most frequent and an aggregation of plate type frequently occurred at lower temperatures.



中文翻译:

韩国山区和沿海地区用PARSIVEL测风仪测量的降水颗粒特征

这项研究分析了在过去两年(2010年–2010年)在山区(大关岭市,DG)和沿海地区(木浦市,MP)使用光学测斜仪parsivel观测到的HC(水体分类),降雨率和DSD(水滴尺寸分布)。 2011)。毛毛雨,下雨和下雪的HC精度分别约为95%,87%和80%。R 2带有TB(浸水桶)雨量计的雨滴(测定系数)在MP处为0.91,在DG处为0.96。在DG和MP观察到的细雨和雨DSD的形状相似,而雪DSD的变化很容易受到温度和风速等天气条件的影响。相对温暖的温度(–5°C〜-0°C)使直径约0.6〜1 mm的雪颗粒数浓度增加,相对寒冷的温度(–15°C〜-10°C)使直径2 mm以上的雪粒数量浓度减小。尽管风速不是降雪DSD的主要因素,但较大的颗粒易于在相对强的风况下形成。由于海洋和大陆地区的风向不同,MP和DG的雪粒数量密度(N(D))在雪DSD形状和数量集中方面表现出很大差异。例如,在海洋降水中,MP处的积雪DSD形状比DG处大,并且在DG处观察到的小雪粒比MP处更频繁。另外,在DG于2010年1月至2010年3月进行了相机观测的雪粒类型测量。在DG的测量过程中,板和柱的混合类型最为频繁,并且在较低温度下频繁发生板类型的聚集。

更新日期:2020-04-18
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