Arid
DOI10.1002/joc.7261
Formation of cyclones over the East Mediterranean within Red-Sea Troughs
Ziv, Baruch; Saaroni, Hadas; Etkin, Adi; Harpaz, Tzvi; Shendrik, Lidiya
Corresponding AuthorSaaroni, H (corresponding author), Tel Aviv Univ, Porter Sch Environm & Earth Sci, Dept Geog & Human Environm, POB 39040, IL-6139001 Tel Aviv, Israel.
JournalINTERNATIONAL JOURNAL OF CLIMATOLOGY
ISSN0899-8418
EISSN1097-0088
Year Published2021-06
Abstract in EnglishThe Red-Sea Trough (RST) is a lower-level trough extending from the tropical low-pressure to the Levant. Its annual occurrence in the Levant is 20%, mostly in the autumn. It produces dry weather, but occasionally causing local showers and floods. During winter, the dominant synoptic system over the eastern Mediterranean is the Cyprus low (CL). Previous studies showed that some CLs form within pre-existing RSTs, through a tropical-extratropical interaction. This study is the first comprehensive climatological framework of such formation events, analyzing their occurrence, seasonality, and the resulting rainfall in Israel. The study identified and analyzed CLs formed within the domain 31 degrees-35 degrees N, 30 degrees-36 degrees E within an RST that was detected during the preceding 24 hr. We used the 6-hourly ERA-Interim database, with 0.75 degrees x 0.75 degrees resolution, during 1979-2017, and identified 104 formation events, which constitute 10% of the CLs. Most formation events occur during fall and early winter, similarly to the RST. Eighty four percent of them formed during the evening or night, and almost two thirds of the CLs disappeared temporarily at noon and regenerated afterwards. This is attributed to the sea/land diurnal oscillation. Most of the formed CLs were shallow, with little rain, but some became major storms, like 'Alexa', which caused extreme snowing in Jerusalem, in December 2013. The formation scenarios were divided into four categories, according to the location and propagation of the 500-hPa trough. The first is characterized by a closed cyclone approaching from southwest, often connected to active RSTs. In the second, a trough is deepening from the northern sector, possibly a polar intrusion. In the third, the most populated, a trough is approaching from west. The fourth category contains events with no upper-level support. Composite maps indicate that upper-level positive vorticity advection triggered CL formations, on top of pre-existing above-normal lower-level temperatures, imparted by the RST.
Keyword in Englishcyclogenesis Cyprus low diurnal effect eastern Mediterranean Levant Mediterranean cyclones Red-Sea Trough tropical-extratropical interaction
SubtypeArticle ; Early Access
Language英语
Indexed BySCI-E
WOS IDWOS:000666376500001
WOS KeywordMIDDLE-EAST ; CLIMATOLOGY ; REANALYSIS ; ISRAEL ; WINTER ; STORM ; CLASSIFICATION ; DYNAMICS ; EVENTS ; DESERT
WOS SubjectMeteorology & Atmospheric Sciences
WOS Research AreaMeteorology & Atmospheric Sciences
Document Type期刊论文
Identifierhttp://119.78.100.177/qdio/handle/2XILL650/352247
Affiliation[Ziv, Baruch; Harpaz, Tzvi; Shendrik, Lidiya] Open Univ Israel, Dept Nat Sci, Raanana, Israel; [Saaroni, Hadas; Etkin, Adi; Harpaz, Tzvi] Tel Aviv Univ, Porter Sch Environm & Earth Sci, Dept Geog & Human Environm, POB 39040, IL-6139001 Tel Aviv, Israel
Recommended Citation
GB/T 7714
Ziv, Baruch,Saaroni, Hadas,Etkin, Adi,et al. Formation of cyclones over the East Mediterranean within Red-Sea Troughs[J],2021.
APA Ziv, Baruch,Saaroni, Hadas,Etkin, Adi,Harpaz, Tzvi,&Shendrik, Lidiya.(2021).Formation of cyclones over the East Mediterranean within Red-Sea Troughs.INTERNATIONAL JOURNAL OF CLIMATOLOGY.
MLA Ziv, Baruch,et al."Formation of cyclones over the East Mediterranean within Red-Sea Troughs".INTERNATIONAL JOURNAL OF CLIMATOLOGY (2021).
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