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Atmosphere 2017, 8(6), 106; doi:10.3390/atmos8060106

Theoretical Model of Spiral Rain Clusters and Analysis of Their Horizontal Structure Equation

1
College of the Environment, Northeast Normal University, Changchun 130022, China
2
Research Center for monitoring and warning of dangerous weather of People’s Liberation Army (PLA), College of Meteorology and Oceanography, PLA University of Science and Technology, Nanjing 211101, China
*
Author to whom correspondence should be addressed.
Received: 17 April 2017 / Revised: 7 June 2017 / Accepted: 9 June 2017 / Published: 15 June 2017
(This article belongs to the Section Climatology and Meteorology)
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Abstract

Rain clusters are mesoscale disaster weather systems, and some of rain clusters have spiral structures. In this paper, a theoretical model of spiral rain cluster is established under pseudo-adiabatic approximation, and its horizontal structure equation is obtained. The study shows that the horizontal structure with spiral arm rain clusters has the following characteristics: at locations close enough to the center of the rain clusters, its shape is round and symmetrical; at locations far from the center, there may be spiral arms; the intensity of the vertical ascending motion of the rain cluster decreases with increasing distance from the center; and the vertical ascending motion is larger on the axis of the spiral arms of rain clusters. The conclusions obtained are consistent with not only the numerical results but also the observational facts. View Full-Text
Keywords: rain clusters; theoretical model; horizontal structure equation; spiral arms; numerical solution rain clusters; theoretical model; horizontal structure equation; spiral arms; numerical solution
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Yu, J.; Zhang, J.; Zhang, M. Theoretical Model of Spiral Rain Clusters and Analysis of Their Horizontal Structure Equation. Atmosphere 2017, 8, 106.

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