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Title: Sensitivity of Z-R relations and spatial variability of error in a Doppler Weather Radar measured rain intensity
Authors: Dutta, Devajyoti
Sharma, Sanjay
Kannan, B A M
Venketswarlu, S
Gairola, R M
Rao, T N
Viswanathan, G
Keywords: Radar reflectivity factor
Rain drop size distribution
Rain intensity
Tipping bucket rain gauge
Z‒R relation sensitivity
Issue Date: Aug-2012
Publisher: NISCAIR-CSIR, India
PACS No.:; 92.60.jf
Abstract: A study is carried out to investigate the sensitivity of Z-R relations and spatial variability of error in a Doppler Weather Radar (DWR) measured rain intensity. For this purpose, observations from a DWR at Satish Dhawan Space Centre, SHAR (13.66°N, 80.23°E) and five units of automatic tipping bucket rain gauges around the DWR are utilized. It is found that rain with intensity > 20 mm h-1 occurs for 16% of the total rain time but its contribution is 53% to the total rainfall. Sensitivity of Z-R relations are examined with the help of Z‒R relations developed by two different approaches. One set of relations are developed from Joss Waldvogel Disdrometer (JWD) observations of rain drop size distribution (ZJWD‒RJWD ) and other set of relations are developed with the help of combined use of DWR and rain gauge observations (ZDWR‒RRG). Performance of the DWR is improved with ZDWR‒RRG relation. Using ZDWR‒RRG relations for Z ≤ 30 dBZ and Z > 30 dBZ, the root mean square error (rmse) and bias for DWR measured rain intensity is reduced by 28% & 39% and 33% & 74%, respectively. The bias and error between DWR and rain gauge measured rain intensity are found to decrease with respect to decrease in distance between the rain gauges and DWR.
Page(s): 448-460
CC License:  CC Attribution-Noncommercial-No Derivative Works 2.5 India
ISSN: 0975-105X (Online); 0367-8393 (Print)
Source:IJRSP Vol.41(4) [August 2012]

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