TIAN Shan,FAN Guang-zhou-,HU De-qiang,et al.Characteristic of the Vertical Circulation over the Low-level of the South of Tibetan Plateau during Spring[J].Journal of Chengdu University of Information Technology,2016,(02):190-196.
春季青藏高原南侧低层垂直环流圈的年际变化特征分析
- Title:
- Characteristic of the Vertical Circulation over the Low-level of the South of Tibetan Plateau during Spring
- 文章编号:
- 2096-1618(2016)02-0190-07
- Keywords:
- climatology; climaticdiagnosis; south of tibetan plateau; spring; vertical circulation; the Indian monsoon; rainfall
- 分类号:
- P467
- 文献标志码:
- A
- 摘要:
- 利用1948～2013年NCEP/NCAR的风场、高度场、气温场逐月再分析资料,HADISST海温逐月资料,NOAA逐月PREC降水资料,为讨论春季青藏高原南侧低层(700～925 hPa)垂直环流圈与高原附近地区的降水和大气环流的关系,运用合成分析和相关分析等方法,定义了(12.5～25、80～90)范围内的垂直环流圈强度指数。得出结论:春季青藏高原低层垂直环流圈偏强(偏弱)年,700 hPa高度场上,阿拉伯海地区、印度半岛、孟加拉湾、中南半岛、南海地区为偏强的东风(西风)异常; 925 hPa高度场上,10附近阿拉伯海西南部地区、印度半岛、孟加拉湾为偏强的西风(东风)异常,中南半岛、南海地区为偏强的东风(西风)异常,对应于印度东南部沿海地区是否存在风场辐合。春季青藏高原南侧低层垂直环流圈偏强年,孟加拉湾、中国东部、四川盆地、云贵高原地区受较强烈的西南气流控制,为主要的降水区域,而高原南侧的印度半岛、阿拉伯海为偏北气流,降水偏少; 反之亦然。
- Abstract:
- The intensity index of vertical circulation, in the 12.5 to 25、80 to 90, based on the monthly data of wind, geopotentail height and air temperature from the NECP/NCAR data base, the monthly sea surface temperature data from HADISST and the monthly precipitation data from NOAA in 1948 to 2013,employing correlation analysis,etc,is used to analyze and studythe relationship betweenthe vertical circulation which is low-level,700 hPa to 925 hPa,south of Tibetan Plateau in spring and the precipitation and atmosphere circulation in area next to TP.As result, in the strong(weak)year of the vertical circulation, there positive anomaly of east(west)wind in the Arabian Sea, the India Peninsula, the Bay of Bengal, the Indo-China Peninsula and the South China Sea at the 700 hPa level geo-height. In 925 hPa, also, it exist that strong anomaly of west wind for strong year, east for weak, in the northwestern of Arabian Sea about 10, the India Peninsula, and the Bay of Bengal, opposite in the Indo-China Peninsula and the South China Sea. It also shows a great correlationship with the existence of the cyclone at the southeastern Indian coast region in the same level. In the strong years, the precipitation significant in the Bay of Bengal, the eastern of China, the Sichuan Basin, the Yunnan-Guizhou Plateau by the violent southwest flow. However, the north flow control the India Peninsula and the Arabian Sea which in the southern of TP, bring less precipitation. The situation is opposite in the weak years.
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备注/Memo
收稿日期:2015-09-08 基金项目:国家自然科学基金资助项目(41275079、41505078、41405069); 国家青年科学基金资助项目(41305077)