摘要
分析了飞船主着陆场区1981—1999年1—4月和9—12月因冷空气而产生的偏北大风的过程中气候概况及其天气特征。通过分析发现:主着陆场区因冷空气引起的偏北大风以春季最频繁,秋、冬季最稀少;一天当中偏北大风以午后出现频率最大,午夜出现频率最少;对于不同季节的气压和温度,春、秋两季变化剧烈,冬季相对较小;在大风出现前24小时,主着陆场区的欧亚中高纬度大气环流以两槽一脊型、一槽一脊型、贝湖低压型为主;冷空气入侵前24小时,欧亚天气图上主着陆场区上游低层850hPa中高纬度有明显的冷中心,地面图场区上游冷高压中心的分布主要有3个区域:贝加尔湖西南至新疆、贝加尔湖到内蒙中北部、贝加尔湖西北部。大风前24小时在35～45°N、100～115°E等压线密集,等压线一般都在4根以上。
This paper analyzed climatic general situation and weather characteristic in the process of forming strong wind which caused by cold air in the spacecraft main landing field region during 1-4month and 5-9month of 1981-1999years. It is found that： the northward strong wind in spacecraft main landing field region which caused by cold air is the most frequent in spring and the least in summer and winter, the frequency of northward strong wind is the maximum in the afternoon during one day and the minimum in the midnight, the air pressure and temperature of different season change greatly in spring and autumn and relatively less in winter, the ＂two trough one spinal＂ and ＂one trough one spinal＂ and ＂Beier low pressure＂ is the mainly types of atmospheric circulation of middle and high latitude in main landing field region in 24 hours before the strong wind occurred. There are obvious cold center in upstream lower layer 850hPa of main landing field region in middle and high latitude weather chart of Eurasia in 24 hours before the cold air intruded. There are three distribution regions of cold high pressure centers, they are the southwest of Baikal to Xinjiang and Baikal to the north of Inner Mongolia and the northwest Baikal. The isobar is dense in 35-45oN,100-115oE in 24 hours before strong wind occurred, There are more than four isobars in general case.
出处
《内蒙古气象》
2009年第3期6-9,共4页
Meteorology Journal of Inner Mongolia
关键词
冷空气
偏北大风
冷高压
Cold air
North strong wind
Cold high
