淮河中游雨季前后大气边界层综合观测分析

利用安徽省寿县站边界层综合观测试验资料,对近地面层风、气温、湿度等微气象要素及感热通量、潜热通量、摩擦速度进行综合分析,总结2005年淮河中游雨季开始前后大气边界层的微气象学基本特征及其异同。结果表明:雨季前,气温、相对湿度有明显的日变化,呈单峰单谷型分布;伴随雨季的开始,近地面层气温下降、相对湿度加大,风速波动增大,且各要素日变化减小。6—7月淮河中游的潜热通量远大于感热通量。边界层要素的变化对淮河雨季的开始和结束具有一定的指示意义。

Comprehensive Observation Analysis of Atmospheric Boundary Layer in Huaihe River Basin

The data from the Sino-Japanese co-operational experiment on atmosphere-land interaction processes at Shouxian in the Huaihe River Basin are used to analysis the variations of wind speed,air temperature,relative humidity,and radiation before and during rainy season.Some micrometeorological properties in the near-surface layer are studied.The results show that there was obvious diurnal variation in both air temperature and relative humidity with one peak pattern in dry season.With the onset of rainy season,the air temperature decreased,relative humidity increased,wind speed fluctuated significantly,and the diurnal variation of meteorological elements became less obvious.It is clearly shown that the latent heat flux was far larger than the sensible heat flux over the middle of the Huaihe River basin.The clear variation trends of micrometeorological elements in dry and rainy season have certain indicative significance for forecasting the beginning and ending of rainy season.