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副热带高压北跳与月尖(CUSP)突变 总被引:4,自引:0,他引:4
观测事实表明,大气在一个广泛的时空尺度中出现各类突变现象。本文以René Thom首创的突变论为工具,通过月尖突变模型讨论了副热带高压北跳这一大气突变现象,指出控制参数的渐变如何导致现象的突变,进而解释了大气环流的“(六月)突变”现象。文中还指出,由于行星尺度副热带高压的移行发展,有时与等压面位势高度场的变化直接相联,因而副热带高压未必是作为一个系统“实体”而移行发展的。 相似文献
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The observational facts show that over a wide range of time and space there exist in the atmosphere a variety of catastrophic phenomena. In this paper, the northward jumping of subtropical highs—a catastrophic phenomenon in the atmosphere—is diseussed on the basis of the catastrophe theory initiated by René Thom as well as the cusp catastrophe model; the mechanism of the gradual change of the controlling parameters leading to the abrupt change of the phenomenon is investigated and thus the well-known phenomenon of the "June catastrophe" of the atmospheric circulation interpreted.Also, it is pointed out, as sometimes immediately conditioned by the change of the geopotential values on the isobaric surface, planetary scale subtropical highs are not necessarily moving and developing as "realistic systems". 相似文献
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THE GENERALIZED E-P FLUX OF WAVEMEANFLOW INTERACTIONS 总被引:2,自引:0,他引:2
This paper deals with the generalized E-P flux relation, containing the stratification effect and directly diagnosing the mean zonal acceleration from data. Its advantages are that the mean zonal acceleration may also be diagnosed, even if there is the strong baroclinity in the atmosphere and the heat transportion of the transient disturbances obviously varies with time and spsee. Meanwhile, both the ill-condition /(u'v')_y existing in the E-P flux and the terms correlative with the disturbance displacement η' not easily measured in Andrews' E-P flux are automatically eliminated in the generalized E-P flux. Therefore, it is suitable for directly diagnobing the mean zonal acceleration from observational data. In order to examine the applicability of the generalized E-P flux, it is illustrated that an example is correctly diagnosed by using the generalized E-P flux instead of the E-P flux. 相似文献
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