河西地区地表感热特征分析

利用河西地区13个测站的资料和金塔试验资料,通过聚类分析和小波分析等研究方法,分析了河西地区地表感热的变化特征,结果表明:河西地区13个站感热输送的最大值一般出现在5月或6月,最小值出现在12月。3~4月份普遍急剧增大,在10~11月急剧减少。近50年间,河西地区大部分台站春季感热输送呈上升趋势,夏季呈明显的下降趋势。春季感热通量的主要显著性周期为3年。河西地区中部春季感热变化与风速、地气温差变化的相关关系都比较好,在河西西部春季感热变化与风速的相关关系较好,而在河西东部春季感热变化与地气温差的相关关系较好。

Analyses on Surface Sensible Heat Characteristics over Hexi Region

Using the routine meteorological data of thirteen meteorological stations in Hexi region and Jinta experiment data in 2004,the change characteristics of surface sensible heat in Hexi region are statisticed and analyzed.The main results have been shown as follows: The maximum value of sensible heat transferring at the thirteen stations in Hexi generally appears in May and June,and the minimum value,in December.The sensible heat transferring at most of stations of Hexi in spring,appear an obvious rising tendency,while in summer,it is dropping.It is a common phenomenon that the data suddenly increases from March to April,moreover the sensible heat flux from majority stations have a process that suddenly decrease from October to November.The period oscillations of sensible flux in Hexi are main 3 years.The significances of these period oscillations are not the same in different regions and periods. In the center area of Hexi,sensible heat is in good correlativity with wind velocity and soil-air temperature difference in spring.In the west area of Hexi,correlativity of sensible heat with wind velocity in spring is well.While in the east area of Hexi,correlativity of sensible heat with soil-air temperature difference in spring is well.