[1]HAO Cheng-yuan,XU Chuan-yang,WU Shao-hong.Study on Rainy Season Onset the Longitudinal Range-gorge Region and Its Reasons[J].Research of Soil and Water Conservation,2010,17(05):180-182,186.
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Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
17
Number of periods:
2010 05
Page number:
180-182,186
Column:
Public date:
2010-10-20
- Title:
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Study on Rainy Season Onset the Longitudinal Range-gorge Region and Its Reasons
- Author(s):
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HAO Cheng-yuan1, XU Chuan-yang1, WU Shao-hong2
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1. College of Surveying & Land Information Engineering, He’nan Polytechnic University, Jiaozuo, He’nan 454000, China;
2. Institute of Geographic Sciences and Natural Resource Research, CAS, Beijing 100101, China
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- Keywords:
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the combination of ranges and gorges; rainy season onset time; monsoon system; barrier functions
- CLC:
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P426.615
- DOI:
-
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- Abstract:
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The onset of rainy season is the period of spring grops planting in most regions of Yunnan province, which has direct impact to agricultural production. Based on their daily precipitation of 2001 for time series, this study calculates the onset of rainy season of thirty meteorological stations in the Longitudinal Range-gorge Region in Yunnan province. Taking the composite area of Wuliang Mountain and Ailao Mountain as a boundary line, rainy season onset of most stations are the sixth five-day of April or before in the eastern part but ten or fifteen days later in the western. The reasons are demonstrated as follows: firstly, there is a time difference between two water vapours approaching. It is well known that the South China Sea summer monsoon onset is earlier than Indian summer monsoon. Secondly, the huge mountains, such as Wuliang Mountain and Ailao Mountain, have interception and barrier effect on the incoming vapours including the bay of bengal summer monsoon and the south China sea summer monsoon. It acts on the water vapor transport of not only South China Sea summer monsoon from east to west, but also the Bay of Bengal summer monsoon from west to east in study area. In short, because of the interception and barrier of huge mountains effect on the incoming vapours, the composite area of Wuliang Mountain and Ailao Mountain becomes the boundary line of rainy season onset approaching in time difference, and is one of the dividing zones between the East Asia summer monsoon and the South Asia summer monsoon.