Rain profiling algorithm for the TRMM precipitation radar

Evaluation of GPROF-SSMI/S rainfall estimates over land during the Brazilian CHUVA-VALE campaign

“…The frequency of the TRMM PR is 13.8 GHz (Ku band), which provides high spatial resolution with approximately 4.5 km horizontal and 0.25 km vertical resolution, ranging between 35°N and 35°S and with up to two sampling overpasses per day in a given region. On the other hand, PR has a minimum reflectivity threshold of~17 dBZ, which limits its ability to detect light rains (e.g., b 0.4 mm h − 1 ) (Kummerow et al, 1998;Iguchi et al, 2000). In general, the rainfall estimates R from the 2A25 algorithm are calculated from the estimated true effective reflectivity factor Z e (calculated using the Z e -R relation), in which the parameters a and b are functions of the both the rain type and the heights of the 0°C isotherm and storm top.…”

“…Considering the range of variables within the TRMM PR 2A25 algorithm (e.g., Rain Type, Near-Surface Rain and Near-Surface Z, among others), the instantaneous precipitation is analyzed utilizing the high-spatial-resolution Near-Surface Rain data. The NearSurface Rain Rate is the rain intensity estimated utilizing the near surface reflectivity assuming a rain drop size distribution (see Iguchi et al, 2000). Version 7 (V7) of the PR 2A25 algorithm was used in this work.…”

“…The TRMM PR version 7 (V7) precipitation estimates (2A25 product), described in Iguchi et al (2000), provides 3D reflectivity and 2D rain rate fields at the ground for both land and ocean surfaces throughout the tropics. Kirstetter et al (2013) investigated differences in various aspects between V7 and the previous version 6 (V6) of the PR 2A25 product, including rainfall rate distributions, systematic biases and random errors.…”

Comparison of high-resolution TRMM-based precipitation products during tropical cyclones in the North Indian Ocean

“…The vertical and horizontal resolutions are 250 m and 5 km, respectively, at nadir. The 2A25 product provides the range profiles of radar reflectivity factors with rain attenuation-correction, and rainfall rate for each radar beam by the combination of Hitschfeld-Bordan and surface reference methods (Iguchi et al 2000). This radar surface rain rate product has been taken as a standard reference product for comparison of the other TRMM-based rainfall products.…”

Bright band height assignment with precipitation radar data based on multi-resolution analysis (MRA) of wavelet analysis

“…The bright band height is assigned by looking at the rain echo signal (Awaka et al, 1997). The radar reflectivity factor, Z with the rain attenuation correction for each radar beam is calculated based on the combining methods of Hitschfeld-Bordan and surface reference method (Iguchi et al, 2000). An illustrative view of the TRMM/PR data acquisition mechanism is shown in Fig.…”