Diurnal Variation in the Vertical Profile of the Raindrop Size Distribution for Stratiform Rain as Inferred from Micro Rain Radar Observations in Sumatra  

作　　者：Ravidho RAMADHAN MARZUKI Mutya VONNISA HARMADI Hiroyuki HASHIGUCHI Toyoshi SHIMOMAI 

机构地区：[1]Department of Physics,Andalas University,Padang 25163,Indonesia [2]Research Institute for Sustainable Humanosphere(RISH),Kyoto University,Uji,Kyoto 611-0011,Japan [3]Remote Sensing Laboratory,Interdisciplinary Faculty of Science and Engineering Shimane University,Matsue 690-0823,Japan

出　　处：《Advances in Atmospheric Sciences》2020年第8期832-846,共15页大气科学进展（英文版）

基　　金：supported by the 2019 Basic Research Grants from the Ministry of Research;Technology and Higher Education(Grant No.T/3/UN.16.17/PT.01.03/PD-Kebencanaan/2019)。

摘　　要：The diurnal variation in the vertical structure of the raindrop size distribution(RSD)associated with stratiform rain at Kototabang,West Sumatra(0.20°S,100.32°E),was investigated using micro rain radar(MRR)observations from January 2012 to August 2016.Along with the MRR data,the RSD from an optical disdrometer and vertical profile of precipitation from the Tropical Rainfall Measuring Mission were used to establish the microphysical characteristics of diurnal rainfall.Rainfall during 0000–0600 LST and 1800–2400 LST had a lower concentration of small drops and a higher concentration of large drops when compared to rainfall during the daytime(0600–1800 LST).The RSD stratified on the basis of rain rate(R)showed a lower total concentration of drops and higher mass-weighted mean diameter in 0000–0600 LST and1800–2400 LST than in the daytime.During the daytime,the RSD is likely governed by a riming process that can be seen from a weak bright band(BB).On the other hand,during 0000–0600 LST and 1800–2400 LST,the BB was stronger and the rainfall was associated with a higher concentration of midsize and large drops,which could be attributed to more active aggregation right above the melting layer with minimal breakup.Diurnal variation in the vertical profile of RSD led to a different radar reflectivity(Z)–R relationship in the rain column,in which Z during the periods 0000–0600 LST and1800–2400 LST was larger than at the other times,for the same R.

关 键 词：diurnal variation raindrop size distribution micro rain radar stratiform rain Kototabang 

分 类 号：P412.25[天文地球—大气科学及气象学]