Raindrop size distribution of easterly and westerly monsoon precipitation observed over Palau islands in the Western Pacific Ocean

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Title:	Raindrop size distribution of easterly and westerly monsoon precipitation observed over Palau islands in the Western Pacific Ocean
Authors:	西拉;Krishna, U.V. Murali;Reddy, K. Krishna;Seela, Balaji Kumar;Shirooka, Ryuichi;Lin, Pay-Liam;Pan, Chen-Jeih
Contributors:	地球科學學院大氣科學學系
Keywords:	altitude;cold;convection;islands;Marine;Mass-weighted mean diameter;moderate resolution imaging spectroradiometer;monsoon season;Normalized intercept parameter;Pacific Ocean;Palau;radar;rain;Raindrop size distribution (RSD);Rainrate;seasonal variation;spatial data;wind
Date:	2016-06-15
Issue Date:	2026-04-21 14:14:20 (UTC+8)
Publisher:	Elsevier BV;Elsevier B.V
Abstract:	摘要： This paper explores the characteristics of raindrop spectra in terms of raindrop size distribution (RSD) using 4years of Joss–Waldvogel disdrometer data over Palau islands (7o 20′ N, 134o 28′ E) in Western Tropical Pacific ocean. The RSD characteristics are studied in two seasons (easterly monsoon—EM and westerly monsoon—WM) using three (stratiform, deep convection, and shallow convection) rain types identified from collocated 1290-MHz wind profiler radar (WPR). In addition to the ground-based sensors observations, TRMM and MODIS satellite-derived rain parameters and atmospheric parameters are utilized to study RSD characteristics. RSD characteristics stratified on the basis of rainrate show that the mean values of raindrop concentrations of small (medium and larger) drops are same (more) in WM compared to EM season. Normalized gamma distribution of RSD shows that the mean value of mass-weighted mean diameter, Dm (normalized intercept parameter, log10Nw), is higher (lower) in WM than the EM season. In addition, the mean value of Dm (log10Nw) is higher (lower) in deep convective precipitation as compared to the other two types of precipitation (stratiform and shallow convection) in both monsoon periods. In conjunction with the remote sensing data (MODIS & TRMM), RSD shows that the presences of cold clouds which extend to deeper altitudes are responsible for the higher Dm during WM season. The immediate significance of the present work is that (1) it contributes to our understanding of seasonal variations of RSD and distribution of different rain types, and (2) it provides information which is useful for quantitative estimation of rainfall from weather radar observations. •Limited studies are carried out over Tropical Pacific Ocean, especially over Palau.•This paper deals with the long-term variations of rain-drop size distribution over Palau Islands.•Deals with the raindrop size distribution during different monsoon seasons using better rain classification.•This study provides information useful for quantitative estimation of rainfall from weather radar observations. 出版者： Elsevier B.V 出版日期： 2016-06-15 出處： Atmospheric Research, 2016-06, Vol.174-175, p.41-51 資源來源： ScienceDirect 版權： 2016 Elsevier B.V. 識別號： ISSN: 0169-8095 識別號： EISSN: 1873-2895 識別號： DOI: 10.1016/j.atmosres.2016.01.013
Appears in Collections:	[Department of Atmospheric Sciences] journal & Dissertation

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