| 青藏高原冬春季积雪影响南海季风爆发的机制 |
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| 引用本文： | 李青,刘宣飞,潘敖大.青藏高原冬春季积雪影响南海季风爆发的机制[J].南京气象学院学报,2008,31(2):214-220. |
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| 作者姓名： | 李青 刘宣飞 潘敖大 |
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| 作者单位： | 1. 南京信息工程大学,江苏省气象灾害重点实验室,江苏,南京,210044
2. 江苏省气象局,江苏,南京,210008 |
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| 基金项目： | 中国气象局气候变化专项基金 |
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| 摘 要： | 利用1958-1998年NCEP／NCAR再分析资料、1975-1998年OLR资料和1973-1998年青藏高原月平均积雪日数站点资料，分析了高原冬春季积雪影响南海季风爆发的可能机制。结果表明：多雪年，高原感热加热偏弱，高原地区以及东侧的中上层大气温度偏低，大尺度经向温度梯度逆转时间偏晚；同时高原地区Hadley环流季节转换时间偏晚，中南半岛上空维持下沉异常气流，导致孟加拉湾副高断裂偏晚，中南半岛地区对流爆发偏晚，中南半岛地表温度下降时间偏晚，中南半岛与南海局地纬向温度梯度逆转时间偏晚；上述大尺度经向温度梯度和中南半岛与南海局地纬向温度梯度的共同作用使得南海季风爆发偏晚。
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| 关 键 词： | 南海季风爆发 青藏高原积雪 温度梯度逆转 |
| 文章编号： | 1000-2022(2008)02-0214-07 |
| 修稿时间： | 2007年10月16 |
Mechanism of Impacts of Winter-Spring Snow Cover over the Tibetan Plateau on South China Sea Monsoon Onset |
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| LI Qing,LIU Xuan-fei,PAN Ao-da.Mechanism of Impacts of Winter-Spring Snow Cover over the Tibetan Plateau on South China Sea Monsoon Onset[J].Journal of Nanjing Institute of Meteorology,2008,31(2):214-220. |
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| Authors: | LI Qing LIU Xuan-fei PAN Ao-da |
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| Institution: | LI Qing , LIU Xuan-fei , PAN Ao-da ( 1. Jiangsu Key Laboratory of Meteorological Disaster,NUIST,Nanjing 210044 ,China; 2. Jiangsu Meteorological Bureau,Nanjing 210008,China) |
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| Abstract: | By using 1958-1998 NCEP/NCAR reanalysis, 1975-1998 OLR and 1973-1998 monthly snow cover days（SCD） at 115 stations over the Tibetan Plateau（TP） and its peripheral areas, the possible mechanism of impacts of winter-spring snow cover on the South China Sea（SCS） monsoon onset is investigated. The increase in winter-spring snow cover is associated with the weakening of sensible heating over the TP, and with the decrease in temperature in the middle-upper troposphere over the TP and its east side, thus leading to a later reversion of large-scale meridional temperature gradient. At the same time, the seasonal reversion of Hadley Circulation in the TP region will also take place later than normal ,with the abmormal descent airflow maintaining over the Indo-China Peninsula（ICP） ,causing a later split of the subtropical high over the Bay of Bengal, and a later outbreak of convective activities over the ICP,in such a way that the surface temperature over the ICP will decrease later, resulting in a later reversion in local zonal temperature gradient between the ICP and the SCS. The SCS monsoon may outbreak later under the joint action of the above large-scale meridional and local zonal temperature gradients. |
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| Keywords: | SCS monsoon onset snow cover over the TP reversion of temperature gradient |
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