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http://dx.doi.org/10.14191/Atmos.2019.29.2.197

Sensitivity Analysis of Polarimetric Observations by Two Different Pulse Lengths of Dual-Polarization Weather Radar  

Lee, Jeong-Eun (Radar Analysis Division, Weather Radar Center, Korea Meteorological Administration)
Jung, Sung-Hwa (Radar Analysis Division, Weather Radar Center, Korea Meteorological Administration)
Kim, Jong-Seong (Radar Operation Division, Weather Radar Center, Korea Meteorological Administration)
Jang, KunIl (Radar Analysis Division, Weather Radar Center, Korea Meteorological Administration)
Publication Information
Atmosphere / v.29, no.2, 2019 , pp. 197-211 More about this Journal
Abstract
The observational sensitivity of dual-polarization weather radar was quantitatively analyzed by using two different pulse widths. For this purpose, test radar scan strategy which consisted of consecutive radar scan using long (LP: $2{\mu}s$) and short (SP: $1{\mu}s$) pulses at the same elevation angle was employed. The test scan strategy was conducted at three operational S-band dual-polarization radars (KSN, JNI, and GSN) of Korea Meteorological Administration (KMA). First, the minimum detectable reflectivity (MDR) was analyzed as a function of range using large data set of reflectivity ($Z_H$) obtained from JNI and GSN radars. The MDR of LP was as much as 7~22 dB smaller than that of SP. The LP could measure $Z_H$ greater than 0 dBZ within the maximum observational range of 240 km. Secondly, polarimetric observations and the spatial extent of radar echo between two pulses were compared. The cross-polar correlation coefficient (${\rho}_{hv}$) from LP was greater than that from SP at weak reflectivity (0~20 dBZ). The ratio of $Z_H$ (> 0 dBZ) and ${\rho}_{hv}$(> 0.95) bin to total bin calculated from LP were greater than those from SP (maximum 7.1% and 13.2%). Thirdly, the frequency of $Z_H$ (FOR) during three precipitation events was analyzed. The FOR of LP was greater than that of SP, and the difference in FOR between them increased with increasing range. We conclude that the use of LP can enhance the sensitivity of polarimetric observations and is more suitable for detecting weak echoes.
Keywords
Sensitivity; pulse width; minimum detectable reflectivity; frequency of reflectivity;
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