| 九龙站在西南低涡/晴朗天气背景下观测资料的对比分析 |
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| 引用本文： | 卢萍,李英.九龙站在西南低涡/晴朗天气背景下观测资料的对比分析[J].高原山地气象研究,2019,39(4):31-38. |
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| 作者姓名： | 卢萍 李英 |
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| 作者单位： | 中国气象局成都高原气象研究所/高原与盆地暴雨旱涝灾害四川省重点实验室,成都 610072 |
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| 基金项目： | 国家自然科学基金项目(41405145)；中国气象局成都高原气象研究所开放实验室基金项目(BROP201914) |
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| 摘 要： | 本文基于中国气象局成都高原气象研究所2017年西南涡加密观测资料,对比分析了西南低涡主要源地九龙站在西南低涡/晴朗这两种不同天气背景下,各个基本物理量的日变化特征及存在的差异,认为:西南涡天气背景下,边界层高度较低,而晴朗天气状况下,边界层大气湍流运动强烈,对流混合伸展高度非常惊人,能超过3000m。西南涡天气背景下,夜间大气较为暖湿,气压显著偏低,上层大气风速较大,便于动量下传。晴朗天气背景下,大气较为干燥,温度日较差偏大,大气压较高,白天湍流混合强。越靠近地面差异越显著,差值随高度的增加而逐渐减小。
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| 关 键 词： | 西南低涡 观测资料 天气背景 边界层 日变化 |
| 收稿时间： | 2019-10-28 |
A Comparative Analysis of Intensive Sounding Data at Jiulong Station in Southwest Vortex /Sunny Days |
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| Affiliation: | Institute of Plateau Meteorology CMA, Chengdu/Heavy Rain and Drought-Flood Disasters in Plateau and Basin Key Laboratory of Sichuan Province,Chengdu 610072, China |
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| Abstract: | The daily characteristics and differences of basic physical quantities are comparatively analyzed in the background of Southwest Vortex and sunny days,based on the intensive sounding data in 2017 at Jiulong station,a main resource region of Southwest Vortex.The results are as follows:In the Southwest Vortex background,the boundary layer height is much lower,but in sunny days,atmosphere turbulence in the boundary layer acts actively and the boundary layer height can reach above 3000m.In the Southwest Vortex background,warm and wet air is dominant at night,air pressure is obviously low,and wind speed in the upper layer is big.While in sunny days,air is much dry,diurnal range of temperature is obvious,air pressure is high,and turbulence is mixing well in the daytime.These differences are much more remarkable near to the ground layer,and gradually decrease along the the height increasing. |
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