On the Contribution of Heat Released by Condensation to the Change in Pressure Pattern

[摘要] whether does the heat released by condensation actualy affect the large scale pattern or not? In order to answer this question, we examined the conservation of the potential vorticity and potential temperature in rainly regions for 12 hr period. At the same time, computing the 3-dimensional distribution of 12 hourly condensation by using the continuity relation of water vapour, we estimated the expected amount of the individual change of potential vorticity, and compared it with the observed one. As an example, a case of medium intensity of rainfall was taken, and it was found that the change of potential vorticity in the condensation region was small and hardly detectable. However, for the second case, when the extremely intense and large scale precipitation occurred, considerably large change of potential vorticity which has the same sense with the expected one is observed. Finally, the quantitative discussions about these two cases are performed.

[学科分类] 大气科学