Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2010, Vol. 7, No. 1, pp. 61-74
Effect of a large-scale spaced atmospheric environment
on trajectories of tropical cyclones
N.M. Astafieva
, M.D. Raev
Space Research Institute of RAS (IKI RAS), 117997 Moscow, Profsoyuznaya 84/32
Trajectories of the most part of the Atlantic tropical cyclones (TC) significant differ from "standard", representing a parabola with top at the left, - they can have a primary direction of movement the south-north, or the east-west, anticyclonic loops enough the big area and so on; in different years the central part of Atlantic can be as free from TC, and often to be crossed by them. An atmospheric situation over northern Atlantic and influence of a spaced atmospheric environment on changes of trajectories of cyclones are studied on the basis of the joint analysis of TC statistics and data of microwave satellite monitoring. The analysis of series of daily global radio thermal fields of the Earth from electronic collection GLOBAL-Field (http://www.iki.rssi.ru/asp) has shown, that changes of a radio thermal field which may be associated with the formation of large-scale long-term areas with lowered or raised of moisture content of atmosphere, can lead to sharp changes of a direction and speed of movement of cyclones. Besides, powerful TC, taking out a lots of amount of a moisture from an intratropical zone of convergence in higher latitudes, essentially change an atmosphere condition over Atlantic and leave a long-living large-scale trace which certainly influences movement of the next TC. For the adequate description of dynamics and power of a tropical cyclone, theoretical and forecast models should consider dynamic and meteorological conditions in spaced enough large-scale atmospheric environment of a cyclone - in the considered cases it there was practically all northern Atlantic
Keywords: the general circulation of atmosphere, a trajectory of tropical cyclones, a spaced atmospheric environment, microwave remote sensing
Full text