BAROTROPIC BEHAVIOUR AND MOTION OF CUT-OFF LOW

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BANI HASHEM T.; ARDEKANI H.; TAJBAKHSH S.

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Journal: Journal of the Earth and Space Physics Year:2000 | Volume:26 | Issue:1 Page(s): 15-26

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Title

BAROTROPIC BEHAVIOUR AND MOTION OF CUT-OFF LOW

Author(s)

BANI HASHEM T. | ARDEKANI H. | TAJBAKHSH S. | Issue Writer Certificate

Keywords

VORTICITYQ4

EQUIVALENT BAROTROPIC MODELQ4

CUT-OFF LOWQ4

Abstract

The CUT-OFF LOW is a phenomenon which our country often faces with in winter. So, it is attempted here to introducte its synoptic and dynamic aspects from barotropic point of view, hoping to present a better view of this atmospheric phenomenon. The case studied here occurred from 20th of February to 1st of March, 1997, with a life cycle of ten days. The aim of this work is to present a model of the phenomenon and its meteorological effects through careful studies of a number of dynamic parameters, such as relative, absolute and potential vorticites and also vertical velocity. The fundamental part of the work is to produce clear self-descripitive plots of the computed parameters which are related to the observed history of the CUT-OFF LOW, the following conclusions may be inferred. The case studied here is a polar CUT-OFF LOW with a very slow motion. The maximum activity of the system is when its spatial axis settels along the north-west to south-east direction. It is this stage of development that system is associated with strong southwesterly winds together with more heavy precipitation. The absolute VORTICITY solenoids, when formed in the south-west region of trough-line cause the system to be developed with rapid cyclonic rotation. The maximum vertical velocity is about 3cm/s at 500 hPa level according to equivalent model, which decreases in the upper and lower levels. After 6 days from appearance of the system, the barotropic condition becomes dominant (i. e. the spatial maximum gradient of the contour lines.

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APA: Copy

BANI HASHEM, T., ARDEKANI, H., & TAJBAKHSH, S.. (2000). BAROTROPIC BEHAVIOUR AND MOTION OF CUT-OFF LOW. JOURNAL OF THE EARTH AND SPACE PHYSICS, 26(1), 15-26. SID. https://sid.ir/paper/80542/en

Vancouver: Copy

BANI HASHEM T., ARDEKANI H., TAJBAKHSH S.. BAROTROPIC BEHAVIOUR AND MOTION OF CUT-OFF LOW. JOURNAL OF THE EARTH AND SPACE PHYSICS[Internet]. 2000;26(1):15-26. Available from: https://sid.ir/paper/80542/en

IEEE: Copy

T. BANI HASHEM, H. ARDEKANI, and S. TAJBAKHSH, “BAROTROPIC BEHAVIOUR AND MOTION OF CUT-OFF LOW,” JOURNAL OF THE EARTH AND SPACE PHYSICS, vol. 26, no. 1, pp. 15–26, 2000, [Online]. Available: https://sid.ir/paper/80542/en

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