| From the point view at the role of the apparent heat source over the "fishtail" type topography in Tibetan Plateau, this study investigated the relationship between the heat source over "fishtail" type topography in Tibetan Plateau and the atmospheric water cycle, as well as the cloud-water resource in the Tianshan Mountain regions, using the satellite data, the monthly National Centers for Atmospheric Prediction and the National Center for Atmospheric Research (NCEP/NCAR) reanalysis, together with the Climatic Research Unit (CRU)precipitation data. The goals of this study is achieved by the investigation on the changes of atmospheric water cycle structure in Tianshan Mountain regions in terms of diagnosis on column water vapor, moisture transport, the correlated vector and the apparent heat source. The study also analyzed the spatial-temporal distribution of rainfall and its variation. The results show that the large parts of precipitation and column water vapor over region of Tianshan Mountain are concentrated over its west part. The vertical structure of temperature, humidity and vertical movement of the Tianshan area represented an atmospheric structure that highly correlated to the rich cloud-water resources over "fishtail" type region, also characterized the effects of topography on climbing airflow over this region. The analysis on the vertical structure of apparent heat source and sink of water vapor also revealed that the rich cloud-water resource is well consistent with the apparent heat source over Tibetan Plateau fishtail type topography. From the corrections analysis of whole layer of water vapor over Tianshan and the whole of East Asia as heat source of heat, we can get the critical areas of heat source which effects Tianshan’s precipitation and is located "fishtail" type region in Tibetan Plateau. All shows that precipitation in tianshan is under the influence of "fishtail" type topography in Tibetan Plateau. We further analyzed the integrate image of the long distant moisture source, which formed the rich cloud-water resources over "fishtail" type region using the methods corrections analysis between the whole layer of water vapor over Tianshan and the Extensive layer of water vapor, The results indicated that spring atmospheric moisture is mainly located in the Norway sea, the Caspian Sea and the Arabian Sea, while summer atmospheric moisture is mainly located in the Arctic Ocean and the Arabian Sea. The correlated vector of heat source for critical area of "fishtail" type topography in Tibetan Plateau and the whole layer of water vapor shows the Water vapor channel structure which formed under the dynamical and thermal influence of "fishtail" type topography in Tibetan Plateau, we found that: In Spring, South of North of the Atlantic Ocean and the Arctic Ocean water vapor transport channels transport the Water vapor to Tianshan area; In summer, the South side of the Atlantic Ocean and North of the Arabian Sea and the Arctic Ocean water vapor transport channel transport the Water vapor to Tianshan area. The interannual cycle changes of Tianshan’s precipitation experienced reduced-increased-reduced-increased of changes trend, Tianshan’s whole layer water vapor experienced increased-reduced-increased-reduced of changes trend, heat source for critical area of "fishtail" type topography in Tibetan Plateau experienced weakened-enhanced-weakened-enhanced of changes trend, to some extent, Tianshan’s precipitation and heat source for critical area of "fishtail" type topography in Tibetan Plateau has the same trend in decades, while heat source for critical area of "fishtail" type topography in Tibetan Plateau enhanced, Tianshan’s precipitation increased, on the contrary, heat source for critical area of "fishtail", type topography in Tibetan Plateau weakened, Tianshan’s precipitation reduced. In addition, the whole layer moisture of the tianshan and the ocean water vapor sources over a long distance cycle analysis, found the whole layer moisture of tianshan and long distance sea water vapor source are consistent with Periodic oscillation. The above analysis shows that the response mechanism of the regional atmospheric moisture cycle structure to the apparent heat source over "fishtail" type topography in Tibetan Plateau. |
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