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Advances in Geosciences An open-access journal for refereed proceedings and special publications
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Volume 7
Adv. Geosci., 7, 321-325, 2006
https://doi.org/10.5194/adgeo-7-321-2006
© Author(s) 2006. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.
Adv. Geosci., 7, 321-325, 2006
https://doi.org/10.5194/adgeo-7-321-2006
© Author(s) 2006. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

  02 May 2006

02 May 2006

Performance of a rain retrieval algorithm using TRMM data in the Eastern Mediterranean

D. Katsanos1,2, N. Viltard3, K. Lagouvardos1, and V. Kotroni1 D. Katsanos et al.
  • 1National Observatory of Athens − IERSD, Greece
  • 2University of Patras − Department of Physics, Greece
  • 3CETP/IPSL, Paris, France

Abstract. This study aims to make a regional characterization of the performance of the rain retrieval algorithm BRAIN. This algorithm estimates the rain rate from brightness temperatures measured by the TRMM Microwave Imager (TMI) onboard the TRMM satellite. In this stage of the study, a comparison between the rain estimated from Precipitation Radar (PR) onboard TRMM (2A25 version 5) and the rain retrieved by the BRAIN algorithm is presented, for about 30 satellite overpasses over the Central and Eastern Mediterranean during the period October 2003–March 2004, in order to assess the behavior of the algorithm in the Eastern Mediterranean region. BRAIN was built and tested using PR rain estimates distributed randomly over the whole TRMM sampling region. Characterization of the differences between PR and BRAIN over a specific region is thus interesting because it might show some local trend for one or the other of the instrument.

The checking of BRAIN results against the PR rain-estimate appears to be consistent with former results i.e. a somewhat marked discrepancy for the highest rain rates. This difference arises from a known problem that affect rain retrieval based on passive microwave radiometers measurements, but some of the higher radar rain rates could also be questioned.

As an independent test, a good correlation between the rain retrieved by BRAIN and lighting data (obtained by the UK Met. Office long range detection system) is also emphasized in the paper.

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