临汾市草面温度变化特征及影响因子分析

利用临汾市2007年-2011年2月的草面温度和相应的地面温度、气温、总低云量、降水、日照、风速等资料，采用数理统计、相关分析、一元线性回归分析等方法，对草面温度的日、月、季、年变化特征及其与各气象要素的关系进行分析。结果表明：①草面温度呈逐年上升趋势。月平均草面温度的最高值出现在7月，最低值出现在1月，年较差为33．7℃。②草面温度日变化呈现“降一升一降”的变化趋势。日平均草面温度最高值在春、夏、秋三季一般出现在13时，在冬季出现在14时，最低值在春秋季一般出现在6时，夏季出现在5时，冬季出现在7时。③草面温度与气温、地温均呈现明显的线性正相关。草面温度高于气温，草面温度的极端值振幅比气温的偏大；地面温度高于草面温度。④引起草面温度变化的气象因素较多，主要是低云量和总云量，其次是降水、日照和风速。

Analysis of the Variation Characteristics of Grass Surface Temperature and Influence Factors in Linfen City

The relationship between the daily, monthly, seasonal and annual variation characteristics of grass surface temperature and the meteorological elements low cloud amounts, precipitation, sunshine and wind is analyzed using land surface temperature, air temperature, total speed in February from 2007 to 2011. The results show that the grass surface temperature has an increasing trend. The max value of the monthly mean grass surface temperature is in July and the min value in January. The annual range of grass surface temperature is 33. 7~C. The daily change ot grass surface temperature showed the drop-rise-drop trend. The max grass surface temperature is at 13：00 in spring, summer and autumn. It is at 14：00 in winter. The min grass surface it is at 05：00 in summer and it is at 07：00 in winter. It shows a si temperature is at 06：00 gnificant positive linear in spring and autumn and correlation between grass surface temperature and air temperature and land surface temperature. There are many meteorological elements caused the change of grass surface temperature. The low cloud amounts and total cloud amounts are main elements and the precipitation, sunshine and wind speed are second elements