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| Titel |
Generation Scenarios of Mediterranean Cyclones |
| VerfasserIn |
Baruch Ziv, Hadas Saaroni, Tzvi Harpaz |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250076335
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| Zusammenfassung |
| The aim of this study is to objectively identify relations between formation of Mediterranean
cyclones (MCs) and existing cyclones, regarded as ’parent cyclones’. Our hypothesis is
that most of the MCs are ’daughter cyclones’ of parent European cyclones or of
tropical cyclonic systems, such as the Red Sea trough. The cyclone detection is based
on 61 years data (for the months October-May, 1950-2010) of sea-level pressure
(SLP).
First, the MCs were scanned and tracked. Then they were divided to those formed within
the Mediterranean and those entered into the Mediterranean from the Atlantic, Europe or
North Africa. For each of the MCs formed within the Mediterranean, we searched for its
parent cyclone. This is done by mapping the ’area of influence’ (AOI) for the existing
cyclones 6 hours prior to the formation of the new MC. The AOI is determined by mapping
the curvature of the streamlines on the 1000-hPa level, starting from the cyclone center, and
proceeding outwards, through continuous region with positive (cyclonic) curvature and
higher SLP values while moving farther from the cyclone center. If the location of a new
MC is found within the AOI of existing cyclone, or within a distance of 2Ë from
such, it is regarded as its daughter cyclone. In a case when a new MC is found in an
AOI of more than one existing cyclone, the closest one is regarded as its parent
cyclone.
An objective analysis of the MCs for the study period indicates that 96.5% of them are
daughter cyclones. The parent cyclones of 35.5% of them were found to be older MCs, i.e.,
within the Mediterranean Basin, 30% are outside and north of the Mediterranean (north of
36Ë N and west of 40Ë E) and 16.5% are outside and south of the Mediterranean
(south of 36Ë N and west of 40Ë E). The rest of the daughter MCs either have
parent cyclones east of 40Ë E (14.4%) or found to have no parent cyclone (3.6%). |
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