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Climatological validation of TRMM precipitation radar monthly rain products over Cyprus during the first 5 years (December 1997 to November 2002)

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Abstract:

A climatological network of rain gauges operating since 1917 in the island of Cyprus has been used to validate the Tropical Rainfall Measuring Mission (TRMM) Precipitation Radar product over the southeastern Mediterranean Sea. A gridded, monthly TRMM product has been used: the so-called 3A–25hr, version-5. All the rain gauges are covered by eight (3A–25hr) 0.5° × 0.5° pixels: between 32° (33.5°) and 34° (34.5°) East (North). The comparison during the first 5 years of the TRMM mission (December 1997–November 2002) shows that quantitative estimates of TRMM Precipitation Radar are remarkably reliable during three (out of four) wettest months: November, December and January. The gauge and TRMM 5-year average is respectively 284 and 279 mm/(3 months). With respect to the previous 81 years, the rain gauges show an increase of rainfall in the rainiest month, December (+19 mm/month), a decrease in January (−40 mm/month) and February (−24 mm/month) and an overall decrease (from 566 mm/year to 520 mm/year). The TRMM Ku-band radar confirms the paradoxical increase of rain in a single month in spite of decrease in total value per year.

German
Ein klimatologisches Netz von Regenmessern ist seit 1917 auf der Insel Zypern in Betrieb. Es wurde benutzt, um die Produkte des TRMM-Satelliten über dem südöstlichen Mittelmeer zu validieren. TRMM steht dabei für Tropical Rainfall Measuring Mission. Der Vergleich wurde für die ersten fünf Betriebsjahre des Satelliten von Dezember 1997 bis November 2002 durchgeführt. Er zeigt für die feuchtesten drei Monate November, Dezember und Januar eine bemerkenswerte Übereinstimmung. Die während der drei Monate gemessenen Niederschlagsmengen betrugen im Mittel 284 mm (Boden) und 279 mm (Satellit). Verglichen mit den voran gegangenen 81 Jahren hat es während des regenreichsten Monats Dezember eine Zunahme gegeben, im Januar/Februar jedoch eine Abnahme. Dies geschah bei gleichzeitiger Abnahme des mittleren Jahresniederschlages (von 566 mm auf 520 mm). Das TRMM Radar bestätigt die "paradoxe" Zunahme des Niederschlages im feuchtesten Monats, trotz der Abnahme des Jahresniederschlages.

Document Type: Research Article

DOI: http://dx.doi.org/10.1127/0941-2948/2006/0158

Publication date: October 1, 2006

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  • Meteorologische Zeitschrift (originally founded in 1866) is the joint periodical of the meteorological societies of Austria, Germany and Switzerland. It accepts high-quality peer-reviewed manuscripts on all aspects of observational, theoretical and computational research out of the entire field of meteorology, including climatology. Meteorologische Zeitschrift represents a natural forum for the meteorological community of Central Europe and worldwide.
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