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ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2019, Vol. 16, No. 4, pp. 256-262

A study of atmospheric vortex streets formation using satellite observations

A.V. Kazansky 1 , M.G. Aleksanina 1, 2 
1 Institute of Automation and Control Processes FEB RAS, Vladivostok, Russia
2 Far Eastern Federal University, Vladivostok, Russia
Accepted: 17.05.2019
DOI: 10.21046/2070-7401-2019-16-4-256-262
This work is dedicated to a study of the formation mechanism of atmospheric vortex streets (AVS) ­using satellite observations. The status of current research is briefly described and a conclusion is drawn about the absence of understanding of this mechanism in contemporary literature. The main disadvantage consists of a lack of comprehension of the leading role of centripetal acceleration in the process of AVS formation. It is shown that centripetal acceleration, which is a necessary attribute of any vortex, appears in the boundary layer flowing around a curved surface of a bluff body and it is supported by balancing with the transverse pressure gradient. Based on the example of the pair of satellite images NOAA-15 and NOAA-18 past the Jeju Island in January 2015, with an interval of 30 minutes, the calculation of the dynamic parameters of the process of AVS formation (velocity of incident flow, drift speed of vortices, orbital velocity, time and periodicity of AVS formation) is carried out. It has been possible to trace the initial stage of AVS formation and to show that they are formed as a result of shift boundary layer detachment, and the centripetal acceleration which is present at the moment of separation, emerges as the driving mechanism. This confirms the theory proposed in this work.
Keywords: atmospheric vortex streets, formation mechanism, centripetal acceleration, dynamic analysis of satellite images
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