藏北高原地面加热场的季节变化  

THE SEASONAL VARIATION OF SURFACE HEATING FIELD OVER THE NORTHERN QINGHAI-XIZANG PLATEAU

作　　者：季国良[1] 邹基玲[1] 吕兰芝[1] 

机构地区：[1]中国科学院兰州高原大气物理研究所

出　　处：《高原气象》1997年第1期1-9,共9页Plateau Meteorology

摘　　要：利用五道梁１９９３年９月～１９９５年８月的辐射收支资料，分析了该地区地面加热场的季节变化特征。结果表明：春、秋季地面加热场强度有明显的急增和骤减过程，正是加热场的这种突变引起了季节的明显转换；冬季地面积雪多的年份，地面加热场强度较弱，第二年夏季加热场强度则较强；地面加热场强度的季节变化明显，夏季强、冬季弱；冬季地面积雪时间较长时，由于地表反射率增大，地中释放的土壤热通量较无雪时减少。In this paper, the characteristics for seasonal variation of surface heating field are analysed by using the data of radiation budget observed at Wudaoliang during the period from September 1993 to August 1995. The results show that:in spring and autumn, the intensity of surface heating field increases and decreases rapidly, respectively, which cause the season transition. When the duration of surface snow cover is long and intensity of surface heating field is weakness in winter, the intensity of surface heating field is strong in next summer. The seasonal variation of surface heating field is obvious:the intensity is strong in summer and weakness in winter. When the duration of surface snow cover is long, surface albedo is large and the heat released from soil is smaller than that in no snow cover cause the surface heating field acts as a heat sink.

关 键 词：藏北高原 地面 加热场 季节变化 地面热源 

分 类 号：P422.4[天文地球—大气科学及气象学]