. Compendium of meteorology. Meteorology. 636 MECHANISM OF PRESSURE CHANGE High-Level Processes A European school of meteorologists proposed a modified thermal theory [9] of pressure change in which the primary cause is thought to be temperature advec- tion in the stratosphere with secondary thermal effects in the troposphere. There is no doubt that there are strong advective fields about the tropopause and, there- fore, it seems logical to pay attention to the influence of stratospheric advection on pressure changes. A com- prehensive analysis of the large changes which take place near the tr
. Compendium of meteorology. Meteorology. 636 MECHANISM OF PRESSURE CHANGE High-Level Processes A European school of meteorologists proposed a modified thermal theory [9] of pressure change in which the primary cause is thought to be temperature advec- tion in the stratosphere with secondary thermal effects in the troposphere. There is no doubt that there are strong advective fields about the tropopause and, there- fore, it seems logical to pay attention to the influence of stratospheric advection on pressure changes. A com- prehensive analysis of the large changes which take place near the tropopause has been presented by Fleagle [10]. However, as Fleagle mentions, these changes are not sufficient evidence to conclude that the "seat" of the pressure change resides in the stratosphere. The evi- dence which has been presented on the relationships between sea-level pressure change and high-level advec- tion do not support a conclusion that the cause of the sea-level change is to be found in advection in the strato- sphere. The strong changes which occur in the upper atmos- phere may be considered as arising from vertical mo- tion fields which accompany the sea-level pressure changes and which arise from such low-level processes as heating or cooling. A nonuniform field of vertical motion creates strong advective fields in the lower stratosphere as a result of the abrupt change in the vertical temperature gradient near the tropopause. Hence it may be argued that the high-level advective fields are the result rather than the cause of sea-level pressure changes. Similar explanations have been pre- sented by many meteorologists such as the discussion given by Douglas [6] on "Some Facts and Theories about the Upper ; It should also be noted in connection with the high-level processes that Reed [25] has been successful in relating the prominent ozone variations to the fields of vertical motion which are known to accompany the sea-level pressur
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