Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2009, Issue 6, Vol. 2, pp. 163-171
Shallow convection and tropical cyclones formation
М.С. Пермяков
, Е.Ю. Поталова
, Н.П. Маликова
, В.И. Семыкин
Тихоокеанский океанологический институт им. В.И. Ильичёва ДВО РАН, 690041 Владивосток, ул. Балтийская, 43
In the paper under consider processes of interaction of convective atmospheric boundary layer with a
source of heat and a background geostrophic stream which can lead to formation of tropical cyclones as
systems of the closed circulation. Conceptions about a role shallow moist convection in trade winds
clouds gathering is developed as the important factor of formation of tropical cyclones. Within the model
of interaction of convective boundary layer caped to inversion and a geostrophic stream in upper
atmosphere, it is shown that under certain conditions in fields of streamfunctions in a boundary layer and
upper atmosphere areas of the closed circulation appear. These conditions of formation are determined as
parameters of similarity including characteristics of atmosphere, a background stream, a boundary layer
- heights and inversion, intensity and a source of heat extent. Interpretation of the known facts about
tropical disturbances is given on the base of offered model. Relate heating with sea surface temperature,
is shown that it strong influence on speed of formation. Through modeling calculations of flows
development is shown that it essentially depends from heating distribution. Thus the source in the form
of a plateau shows possibility for formation a narrow ring of the cyclonic wind surrounding area of weak
anticyclonic movements in free atmosphere. Similar is observed in development of real cyclones also.
The results of calculations which show formation of such annular vortexes, their disintegration in an
instability consequence on mesowhirlwinds and merge of the last in one cyclone are discussed.
Keywords: tropical cyclones, shallow convection, deep convection
Full text