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• W2909748375 abstract "Deep convective clouds play an important role in global energy balance through vertical transport of water vapor, momentum and energy, altering radiation and also influence hydrological cycle via precipitation. These clouds are organized mainly at Synoptic scale (~1000 km), Mesoscale (~100 km) and storm-scale (~10 km) and involve interactions from micro-scale (e.g., cloud condensation nuclei and droplets) to planetary scale. Physical processes associated with such clouds are the largest sources of uncertainty in atmospheric weather and climate models. Clouds involve rich physics and therefore, studying and understanding of convective clouds is an important research area in weather and climate sciences.In present work, the mesoscale and storm scales of convective cloud systems are addressed using spacebrone and ground based Doppler weather (conventional and polarimetric) radars. The work started with the analysis of cloud systems over Tibetan Plateau. These cloud systems are observed to be very deep in nature. After finding the underestimation of radar reflectivity especially in convective regime, analysis is further extended in entire latitudinal belt of 38°N-38°S. The coincident data collected with the precipitation radar (PR) onboard TRMM (Tropical Precipitation measuring Mission) satellite and profiling radar (CPR) onboard CloudSat satellite is used. It is shown the PR measures properties of convective part but it misses portions of the anvil part of mesoscale convective cloud systems (MCSs). CPR measures the full spatial extent of MCSs however its reflectivity values are very low due to the strong attenuation suffered by the radar beam while passing through a precipitating convective cloud. CPR beam gets attenuated severely during convective rain episodes especially below 6 km height. While going by their technical specification, we can expect substantial overlap in the radar reflectivity factor for convective clouds, very little overlap is observed. One should be very careful while drawing conclusions on the cloud characteristics measured with the PR and CPR. I felt that it is better to study the cloud properties using ground radars, hence, most of the results reported in the thesis are based on ground radar data.As part of the Continental Tropical Convergence Zone (CTCZ) program of the Ministry of Earth Sciences, Govt. India, India Meteorological Department (IMD) made available its Doppler weather radar (DWR) data for the years 2012 and 2013 to researchers within the country. Using IMD DWR data, life cycle of monsoonal MCSs over Indian monsoon zone and properties of storms embedded within MCSs are studied at five locations, namely, Kolkata, Hyderabad, Nagpur, Patiala and Delhi. Stages in the lifecycle of MCSs have been explored including convective area and precipitation fractions. It was observed that intense precipitation within an MCS is confined to several pockets having areas much smaller than that of an MCS. Those convective cells are called storms in this work. Storm is a precipitating…" @default.
• W2909748375 created "2019-01-25" @default.
• W2909748375 creator A5032086517 @default.
• W2909748375 date "2018-11-12" @default.
• W2909748375 modified "2023-09-23" @default.
• W2909748375 title "Characteristics of Convective Clouds Over the Indian Monsoon Zone from Weather Radar Data" @default.
• W2909748375 hasPublicationYear "2018" @default.
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