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Title: Developing a composite rainfall map based on observations from an X-band polarimetric radar network and conventional C-band radar
Authors: Maki, M
Maesaka, T
Kato, A
Kim, D S
Iwanami, K
Keywords: Composite rainfall map
Polarimetric radar
Quantitative precipitation estimates (QPE)
Rainfall attenuation
Signal extinction area
Issue Date: Aug-2012
Publisher: NISCAIR-CSIR, India
PACS No.: 92.60.jf; 84.40.Xb
Abstract: This paper aims to demonstrate the benefits of using X-band polarimetric radar networks for hydrological monitoring. A method of deriving composite rainfall maps is presented based on data from a combination of an X-band polarimetric radar network (X-NET) and supplementary conventional C-band radar, the latter used to extend the observation area. This approach was applied to a heavy rainfall event observed on 7 October 2009 associated with typhoon T0918 (located south of Japan). It was found that a signal extinction area developed behind the band of heavy rainfall, where the scattered signal was below the receiver’s noise level. Three networked X-band radars were able to fill in the signal extinction area, but the blanking azimuthal area of one of X-band radars remained. The use of C-band operational radar provides an alternative and effective approach to filling in the signal extinction area and extending the coverage area when the number of X-band polarimetric radars available is limited. Validation of the composite radar rainfall map using surface rain gauge data showed a good correlation between the two data sources, although the radar tends to underestimate rainfall amounts by around 20% compared with the rain gauges.
Page(s): 461-470
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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