ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 39 Issue 9 > 2013,39(9):1145-1153. DOI:10.7519/j.issn.1000-0526.2013.09.009 Prev Next
Influence of MJO Center Position on Precipitation Process of Yunnan in Winter Half Year
- Article
- Figures
- Metrics
- Preview PDF
- Reference
- Related
- Cited by
- Materials
Abstract:
The research of MJO has showed that it is a new and workable method for studying the extended period weather forecast (10 to 30 days) to use the propagation process of MJO. However, how to predict the extended period rainfall process in winter Yunnan is an important problem to be solved in forecast operations. In this paper, rainfall circulation configurations under the influence of MJO are divided into three types, and the corresponding three weather processes are contrasted and analyzed in order to find the forecast predictors for the extended period weather forecast. The results showed that firstly, the tropical convection activities will be fully aroused when MJO activity center enters into the west Bengal and tropical regions of Pacific (called “wet window”). Otherwise, the tropical convection activity is not active in the upstream region of Yunnan (called “dry window”). Secondly, when MJO is in wet window, the occurrence of precipitation process is under the condition of cold air and suitable circulation. Southerly winds of Southern branch trough or the West Pacific subtropical high guides the water vapor into Yunnan. But, when MJO is in dry window, even though there is befitting condition of water vapor and circulation perturbation, the large scale rainfall process does not happen.
Keywords:
Project Supported:
Clc Number:
Mobile website
