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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:49 |
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Conference: Bucharest University Faculty of Physics 2015 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
Sting Jet generation in extratropical cyclones
Authors:
Mihaela BRÂNCUŞ(1),Cristina BURADA(1)
Affiliation:
1)National Meteorological Administration,Craiova, 200581, Romania
E-mail
mihaela.brancus@yahoo.com
Keywords:
extratropical cyclone, sting jet, Shapiro-Keyser model
Abstract:
Strong surface wind often accompany the low-level-jets that occur along the cold fronts of extra-tropical cyclones, but there is an evidence that the most damaging winds occur in a different part of a certain class of cyclones. These damaging wind appears in cyclones that go through an evolution that involves the formation of a bend-back front and cloud head separated from the polar-front cloud band by a dry slot, as in the frontal fracture model of Shapiro and Keyser (1990). When cyclone attains its minimum central pressure, the trailing tip of the cloud head bounding the bent-back front forms a hook which go to encircle a seclusion of a warm air. The most damaging winds, Sting Jet, occur near the tip of this hook. The name of „sting jet” comes from the analogy with the poisonous sting at the end of a scorpion’s tail, which was derived by Clark et al. (2005) from the reference by Grǿnås (1995) to „the poisonous tail of the bent-back occlusion”, used to describe localized strong winds in this region occurring in some severe cyclones.The existence of the Sting Jet was demonstrated in four cases of cyclones originated from northern basin of the Atlantic Ocean. A similar case occurred in south-eastern of Romania, in 2-3 December 2012. The aim of this study is to establish if the key ingredients of these damaging surface winds, caused by Sting Jet, can be identified in a Mediterranean cyclones when it is reactivated over Black Sea.
References:
(1) Clark, P.A., Browning, K.A. and Wang, C., 2005, The sting at the end of the tail: Model diagnostics of fine-scale three-dimensional structure of the cloud head, Q.J.R. Meteorol.Soc., 131, 2263-2292;
(2) Grǿnås,S., 1995, The seclusion intensification of the new year’s day storm 1992, Tellus, 47A, 733-746;
(3) Shapiro, K.A. and Keyser, D., 1990, Fronts, jet stream and tropopause. In C. Newton and E. O. Holopainen, editors, Extratropical cyclones: the Eric Palmer memorial volume, pag. 167-19, American Meteorological Society.
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