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Fig. 1: (a) Optical disdrometer, (b) Lightning detector, (c) Electric Field Mill
India is probably the place with the highest degree of spatial inhomogeneity when it comes to rainfall. Each part of the country comes with a different set of rain features, uncertainties and behavioral variations. The tropical rain has very distinct features. The occurrence of convective systems as well as the monsoon have different impacts on precipitation structure. Understanding and successful prediction of rainfall asks for detailed microphysical analysis in several rain aspects. The country being a zone of tropical convergence provides a wonderful opportunity to study severe convective systems.Polar (Arctic) precipitation on the other hand is very critical for understanding climate change. Polar precipitation is mostly of frozen type and has completely different microphysical characteristics.
Our research interest includes study of various microphysical aspects of both tropical and polar rain with a principal focus on quality improvement of satellite and ground radar retrieval of rainfall. Experimental observation of tropical rain is a key criterion to understand the underlying physics. Radar and satellite observations are primarily used to understand the rain and cloud microphysics.Fig. 2 shows the rain microphysical behavior under different rain condition. Measurements of varied rain microphysics helps in better representation of the process in NWP models.
Fig 2: Rain microphysics in (a) Stratiform rain and (b) Convective rain observed through Micro Rain RadarOn the other hand, understanding the atmospheric interaction with microwave and millimeter wave is crucial for both remote sensing and communication applications. Since several Indian and international satellites (GSAT-4, GSAT-14, Ka –band altimeter in SARAL-Altika, MeghaTropique, GPM etc.) are utilizing Ka band, the study on this topic is very pertinent to scientific priorities. This not only helps in improving the radar retrieval of the atmospheric parameters but also in channel modelling Ka and higher frequencies for SATCOM applications. We are also working on developing IoT based cost-effective sensors for atmospheric instrument. Fig. 3 shows the in-house developed Ku/Ka band rain attenuation measurement system based on SDR and commercial LNA.
Fig. 3: Left two figures are experimental system of in house developed Ku band system and rightmost figure shows the rain attenuation at Ka bandWe welcome researchers interested in atmospheric science, tropical meteorology, polar atmosphere, radar meteorology and instrumentation to join us for collaboration and as PhD / Post-docs in this group.