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| Titel |
Calendaricities and multimodality in the Eastern Mediterranean cyclonic activity |
| VerfasserIn |
I. Osetinsky, P. Alpert |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 6, no. 4 ; Nr. 6, no. 4 (2006-06-29), S.587-596 |
| Datensatznummer |
250003611
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| Publikation (Nr.) |
 copernicus.org/nhess-6-587-2006.pdf |
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| Zusammenfassung |
| Calendaricities, or the occurrence of weather anomalies on fixed calendar
dates, are investigated for the Eastern Mediterranean (EM). The anomalies
discussed here are the maxima and minima in the frequency of occurrence of
the EM synoptic systems bearing rainfall. Those are mostly the Winter Lows
passing over Cyprus en route eastward of the Ionian Sea where they are
generated in situ or come to from N. Italy. The Winter Lows produce the
rainfall over the central and northern EM areas, including Cyprus, Israel,
Lebanon, NW Syria, W. Jordan. The southern EM areas, i.e. S. Israel and NE
Egypt, get rainfall followed by floods due to the Winter Lows as well, and
in addition, due to a small proportion of the mostly dry Red Sea Troughs
that occasionally turn out to cause heavy rainfall. The analysis of the
daily resolved data based on the NCEP/NCAR reanalysis is carried out. A
comparison of two 28-yr periods, 1948–1975 and 1976–2003, different in global
climatology, showed their similarity in the timing of peaks in EM cyclonic
activity. The winter was found to have five maxima of cyclonic activity,
centered on early February and nearly bell-shaped over their magnitudes.
This supports the earlier hypotheses of multimodality in the EM rainfall.
The Red Sea Troughs have their main peak of occurrence in the late October –
early November, and their small rain-bearing proportion falls as well on
this period of a year. |
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