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Raindrop Size Distributions of Southwest and Northeast Monsoon Heavy Precipitation Observed over Kadapa (14°4'N, 78°82'E), a Semi-Arid Region of India


Affiliations
1 Semi-arid-zonal Atmospheric Research Centre (SARC), Department of Physics, Yogi Vemana University, Kadapa 516 003, India
 

Raindrop size distributions (RSD) of southwest (SW - June to September) and northeast (NE - October to December) monsoon heavy precipitation are measured with PARticle SIze and VELocity (PARSIVEL) disdrometer and Micro Rain Radar (MRR) deployed at Kadapa (14.47°N; 78.82°E), a semi-arid continental site in Andhra Pradesh, India. RSD characteristics stratified on the basis of rainrate showed that the mean values of raindrop concentration of small (medium) drops are less (more) in SW when compared with NE monsoon heavy precipitation. Gamma function applied to heavy precipitation events showed that the mean value of mass weighted mean diameter, Dm (normalized intercept parameter log10 Nw) is higher (lower) in SW monsoon than NE monsoon. Stratiform and convective precipitating cloud fraction observed during SW and NE monsoons revealed that contribution of stratiform precipitation is predominant for the seasonal variation in raindrop size distribution. The coefficient and exponent values of the Z-R relations are higher in SW than NE monsoon in both stratiform and convective precipitation.

Keywords

Raindrop Size Distribution, Rainrate, Mass Weighted Mean Diameter.
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  • Raindrop Size Distributions of Southwest and Northeast Monsoon Heavy Precipitation Observed over Kadapa (14°4'N, 78°82'E), a Semi-Arid Region of India

Abstract Views: 346  |  PDF Views: 124

Authors

J. Jayalakshmi
Semi-arid-zonal Atmospheric Research Centre (SARC), Department of Physics, Yogi Vemana University, Kadapa 516 003, India
K. Krishna Reddy
Semi-arid-zonal Atmospheric Research Centre (SARC), Department of Physics, Yogi Vemana University, Kadapa 516 003, India

Abstract


Raindrop size distributions (RSD) of southwest (SW - June to September) and northeast (NE - October to December) monsoon heavy precipitation are measured with PARticle SIze and VELocity (PARSIVEL) disdrometer and Micro Rain Radar (MRR) deployed at Kadapa (14.47°N; 78.82°E), a semi-arid continental site in Andhra Pradesh, India. RSD characteristics stratified on the basis of rainrate showed that the mean values of raindrop concentration of small (medium) drops are less (more) in SW when compared with NE monsoon heavy precipitation. Gamma function applied to heavy precipitation events showed that the mean value of mass weighted mean diameter, Dm (normalized intercept parameter log10 Nw) is higher (lower) in SW monsoon than NE monsoon. Stratiform and convective precipitating cloud fraction observed during SW and NE monsoons revealed that contribution of stratiform precipitation is predominant for the seasonal variation in raindrop size distribution. The coefficient and exponent values of the Z-R relations are higher in SW than NE monsoon in both stratiform and convective precipitation.

Keywords


Raindrop Size Distribution, Rainrate, Mass Weighted Mean Diameter.



DOI: https://doi.org/10.18520/cs%2Fv107%2Fi8%2F1312-1320