Tropical precipitation studies using VHF/L-band windprofilers and disdrometer over Gadanki, India

K. Krishna Reddy; Kenji Nakamura; Toshiaki Kozu; A. R. Jain; D. Narayana Rao

doi:10.1117/12.410624

21 December 2000 Tropical precipitation studies using VHF/L-band windprofilers and disdrometer over Gadanki, India

K. Krishna Reddy, Kenji Nakamura, Toshiaki Kozu, A. R. Jain, D. Narayana Rao

Proceedings Volume 4152, Microwave Remote Sensing of the Atmosphere and Environment II; (2000) https://doi.org/10.1117/12.410624
Event: Second International Asia-Pacific Symposium on Remote Sensing of the Atmosphere, Environment, and Space, 2000, Sendai, Japan

Abstract

We have been working on rainfall observation project at tropical site in India, in order to study tropical storm structure and raindrop size distribution (DSD) characteristics for improving the current PR rainfall retrieval algorithm, and for making the ground validation of TRMM PR observation. At Gadanki (53-MHz VHF MST radar, an L-band lower atmospheric wind profiler (LAWP), a disdrometer and an optical rain gauge (ORG) are set up to obtain more knowledge on vertical properties of DSD and rain structure during monsoon season. Measurements of drop size distribution (DSD) with disdrometer have been providing the information to study basic DSD characteristics in tropical India. We have found a clear seasonal dependence in Reflectivity (Z) - Rainfall (R) relations (i.e. DSD characteristics) in India. Our results indicate that there are about 3-times differences peak-to-peak in estimates of rain rate using a single Z-R relation. It seems that this type of seasonal dependence should be taken into account to improve the accuracy of the PR algorithm. Drop size distribution characteristics were retrieved in moderate/heavy precipitation using VHF wind profiler. The retrieved drop size parameters were compared to corresponding disdrometer data and found that there is reasonably good agreement between the measurements, lending credence to the profiler retrievals of DSD parameters. Preliminary study on the ground validation of TRMM PR shows fairly good agreement between the disdrometer and TRMM precipitation radar measurements.

Citation Download Citation

K. Krishna Reddy, Kenji Nakamura, Toshiaki Kozu, A. R. Jain, and D. Narayana Rao "Tropical precipitation studies using VHF/L-band windprofilers and disdrometer over Gadanki, India", Proc. SPIE 4152, Microwave Remote Sensing of the Atmosphere and Environment II, (21 December 2000); https://doi.org/10.1117/12.410624

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