Precipitation Measurements from Space

Testud, J.

doi:10.1007/978-3-662-05202-0_7

Cited by 2 publications

(2 citation statements)

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“…The analysis of disdrometer data collected during three months of convective and stratiform precipitation in a region close to Trappes revealed a mean Z-R relationship of Z h ϭ 282 R(Z h ) 1.66 [corresponding to a ϭ 0.0334 and b ϭ 0.6024 in Eq. (1)], which is used for operational rainfall rate estimation (Testud 2003).…”

Section: Datementioning

confidence: 99%

“…7b were observed between the nine combinations. These differences are primarily related to the fact that R(Z h ) was derived from a fixed drop size distribution and axis-ratio parameterization that was found for the Trappes radar (see Testud 2003), while the DSD and axis-ratio parameterizations were varied for R(Z h , Z dr ) and R(K dp ) according to Hagen (2001). The focus of this paper is on the behavior of reflectivity-versus K dpbased rainfall rates as a function of beam shielding and not differences due to different parameterizations.…”

Section: A Sensitivity To Axis-ratio Parameterization and Drop Size mentioning

confidence: 99%

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Effects of Radar Beam Shielding on Rainfall Estimation for the Polarimetric C-Band Radar

Friedrich

Germann

Gourley

et al. 2007

Journal of Atmospheric and Oceanic Technology

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Radar reflectivity (Zh), differential reflectivity (Zdr), and specific differential phase (Kdp) measured from the operational, polarimetric weather radar located in Trappes, France, were used to examine the effects of radar beam shielding on rainfall estimation. The objective of this study is to investigate the degree of immunity of Kdp-based rainfall estimates to beam shielding for C-band radar data during four typical rain events encountered in Europe. The rain events include two cold frontal rainbands with average rainfall rates of 7 and 17 mm h−1, respectively, and two summertime convective rain events with average rainfall rates of 11 and 22 mm h−1. The large effects of beam shielding on rainfall accumulation were observed for algorithms using Zh and Zdr with differences of up to ∼2 dB (40%) compared to a Kdp-based algorithm over a power loss range of 0–8 dB. This analysis reveals that Zdr and Kdp are not affected by partial beam shielding. Standard reflectivity corrections based on the degree of beam shielding would have overestimated rainfall rates by up to 1.5 dB for less than 40% beam shielding and up to 3 dB for beam shielding less than 75%. The investigation also examined the sensitivity of beam shielding effects on rainfall rate estimation to (i) axis–ratio parameterization and drop size distribution, (ii) methods used to smooth profiles of differential propagation phase (ϕdp) and estimate Kdp, and (iii) event-to-event variability. Although rainfall estimates were sensitive to drop size distribution and axis–ratio parameterization, differences between Zh- and Kdp-based rainfall rates increased independently from those parameters with amount of shielding. Different approaches to smoothing ϕdp profiles and estimating Kdp were examined and showed little impact on results.

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Section: Datementioning

confidence: 99%

Section: A Sensitivity To Axis-ratio Parameterization and Drop Size mentioning

confidence: 99%