Winter precipitation fields in the Southeastern Mediterranean area as seen by the Ku-band spaceborne weather radar and two C-band ground-based radars

M. Gabella*, E. Morin, R. Notarpietro, S. Michaelides

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

The spaceborne weather radar onboard the Tropical Rainfall Measuring Mission (TRMM) satellite can be used to adjust Ground-based Radar (GR) echoes, as a function of the range from the GR site. The adjustment is based on the average linear radar reflectivity in circular rings around the GR site, for both the GR and attenuation-corrected . NearSurfZ TRMM Precipitation Radar (TPR) images. In previous studies, it was found that in winter, for the lowest elevation of the Cyprus C-band radar, the GR/TPR equivalent rain rate ratio was decreasing, on average, of approximately 8. dB per decade. In this paper, the same analysis has been applied to another C-band radar in the southeastern Mediterranean area. For the lowest elevation of the "Shacham" radar in Israel, the GR/TPR equivalent rain rate ratio is found to decrease of approximately 6. dB per decade. The average departure at the "reference", intermediate range is related to the calibration of the GR. The negative slope of the range dependence is considered to be mainly caused by an overshooting problem (increasing sampling volume of the GR with range combined with non-homogeneous beam filling and, on average, a decreasing vertical profile of radar reflectivity). To check this hypothesis, we have compared the same . NearSurfZ TPR images versus GR data acquired using the second elevation. We expected these data to be affected more by overshooting, especially at distant ranges: the negative slope of the range dependence was in fact found to be more evident than in the case of the lowest GR elevation for both the Cypriot and Israeli radar.

Original languageAmerican English
Pages (from-to)120-130
Number of pages11
JournalAtmospheric Research
Volume119
DOIs
StatePublished - Jan 2013

Bibliographical note

Funding Information:
The TRMM data were provided by NASA; the ground-based radar data by the Meteorological Service of Cyprus and by E.M.S (Mekorot). The researchers exchanging visits in Cyprus and Italy have been funded in the framework of the “Protocol of Cooperation between the Governments of the Italian Republic and the Republic of Cyprus on Research and Development” and under the RADVAL project (Conventional and non-conventional observations of rainfall in the Southern Mediterranean Sea, Cyprus Research Promotion Foundation Contract No. KY-IT/0906/02 ).

Keywords

  • Cyprus
  • Israel
  • Precipitation Radar
  • Range-adjustment
  • TRMM
  • Weather radar

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