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DOI	10.1016/j.atmosres.2019.06.004
	Seasonal variation of raindrop size distribution over a coastal station Thumba: A quantitative analysis
	Lavanya S.; Kirankumar N.V.P.; Aneesh S.; Subrahmanyam K.V.; Sijikumar S.
发表日期	2019
ISSN	0169-8095
起始页码	86
结束页码	99
卷号	229
英文摘要	Seasonal variation of raindrop size distribution (DSD) is examined using long-term (2007–2015) observations made with Joss-Waldvogel disdrometer at Thumba (8.53°N, 76.87°E), a tropical coastal station. Data sets were classified based on the rain rate and studied the DSD variations for pre-monsoon (PRE) season, post-monsoon (POST) season and summer monsoon (MON) season. The result shows that the larger drop concentration is higher in PRE season compared to other two seasons for the same rain rate. The values of median volume diameter (Dm) are found to be lowest (highest) in MON (PRE) seasons. The gamma parameters (Λ, μ) and normalized DSD scaling parameter for concentration (Nw) are also observed to have a clear-cut seasonal variation. There is a clear trend in the slope (Λ) and Nw parameters with rain rates. Although shape parameter (μ) did not show a linear trend as such, there exist a pattern to its evolution with rain rates that is similar across seasons. The coefficients of A and b in Z-R relations also showed seasonal variations. The plausible causative mechanisms for the observed surface seasonal DSD variations are discussed using satellite and radiosonde observations. The differences in cloud structure and cloud microphysics are found to have a direct influence on the rain DSD spectra at the surface. The present results envisages that the change in monsoon circulation and the origin of cloud system (i.e. maritime or continental) play a vital role in characterizing the rain DSD, while the microphysical and dynamical processes occurring during the descent of raindrops will modify the same. © 2019
语种	英语
scopus关键词	Atmospheric thermodynamics; Coastal engineering; Drops; Radiosondes; Size distribution; Causative mechanisms; Cloud microphysics; Drop concentrations; Monsoon circulations; Radiosonde observations; Raindrop size distribution; Scaling parameter; Seasonal variation; Rain; cloud microphysics; data set; monsoon; quantitative analysis; raindrop; rainfall; seasonal variation; size distribution; tropical region; India; Kerala; Thumba
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/162129
作者单位	Space Physics Laboratory, Vikram Sarabhai Space Centre, Thiruvananthapuram, 695022, India; Department of Physics, University of Kerala, Thiruvananthapuram, 695034, India
推荐引用方式 GB/T 7714	Lavanya S.,Kirankumar N.V.P.,Aneesh S.,et al. Seasonal variation of raindrop size distribution over a coastal station Thumba: A quantitative analysis[J],2019,229.
APA	Lavanya S.,Kirankumar N.V.P.,Aneesh S.,Subrahmanyam K.V.,&Sijikumar S..(2019).Seasonal variation of raindrop size distribution over a coastal station Thumba: A quantitative analysis.Atmospheric Research,229.
MLA	Lavanya S.,et al."Seasonal variation of raindrop size distribution over a coastal station Thumba: A quantitative analysis".Atmospheric Research 229(2019).