| 释义 |
mesocyclone, n. Meteorol.|ˈmiːsəʊˌsaɪkləʊn|
[f. meso- + cyclone n.]
A rotating column of rising air associated with a small area of low pressure, which may develop into a tornado.
1963T. Fujita in Meteorol. Monogr. Sept. 85/2 A mesolow which is found to accompany a definite circulation pattern is called a ‘mesocyclone’. Ibid. 89/2 The existence of a mesocyclone is first seen by radar as a pendant echo which soon curls around the circulation center. 1976Ottawa Citizen 7 Dec. 41/1 Twisters appear to be preceded by peculiar rotating motions within thunderstorms... These rotating features [are] called mesocyclones. 1978N.Y. Times 29 Mar. a 15/4 Observing the wind and rain movement five to six miles up in a thundercloud, a Doppler radar detects the formation of mesocyclones, the parents of tornadoes. 1984Sci. Amer. Apr. 60/3 First the entire thunderstorm updraft begins to rotate; the spinning column of rising air, 10 to 20 kilometers in diameter, is called a mesocyclone. (If it goes on to generate a tornado, which the majority of mesocyclones do not, it is called a tornado cyclone.) |