黄土高原定西地区陆面物理量变化规律研究  

Analysis of variation regularity of land-surface physical quantities over Dingxi Region of the Loess Plateau

作　　者：张强[1,2] 孙昭萱[3,1] 王胜[1] 

机构地区：[1]中国气象局兰州干旱气象研究所、甘肃省干旱气候变化与减灾重点实验室,中国气象局气候变化与减灾重点开放实验室,兰州730020 [2]甘肃省气象局,兰州730020 [3]中国气象局成都高原气象研究所,成都610072

出　　处：《地球物理学报》2011年第7期1727-1737,共11页Chinese Journal of Geophysics

基　　金：国家自然科学基金重点项目“黄土高原陆面过程观测与试验研究”(40575006);国家公益性行业科研专项“西北地区旱作农业对气候变暖的响应特征及其预警和应对技术研究”共同资助

摘　　要：本文利用在黄土高原定西地区长期观测的陆面物理量资料,在分析了土壤温度和湿度等基本特征的基础上,比较系统地研究了陆面辐射分量、能量分量、地表反照率和Bowen比等陆面主要物理量的变化特征,讨论了陆面能量不平衡差额的分布规律,发现黄土高原定西地区陆面物理量特征与其他地区很不同,揭示出的土壤温度日波动向深层的传播规律和8～9月土壤5 cm低温层现象、土壤30 cm"湿层"和6～7月表层逆湿特征、反照率不对称"V"型日变化结构、感热通量的年双峰分布特征、能量平衡分量的不同位相性等均是对陆面物理特征的新认识.By using the long-term integrated data of a variety of land-surface physical quantities observed over the Loess Plateau, based on analyzing the basic characteristics of soil temperature and soil moisture, the variation characteristics of main land-surface physical quantities of landsurface radiation components, land-surface energy components, surface albedo and Bowen ratio are systematically analyzed. The distribution of margin of land-surface energy unbalance is discussed. It is found that the characteristics of the land-surface physical quantities over the Loess Plateau are more different than in other regions. Especially the downward propagation of daily soil temperature, ＂wet layer＂ at 30 cm below the soil surface, asymmetrical ＂ V＂-type daily variation structure of surface albedo, bimodal distribution of sensible heat flux, the differentphase of energy balance components and large margin of land-surface energy unbalance are all the new understanding of characteristics of land-surface physical quantities.

关 键 词：黄土高原 定西地区 陆面辐射收支 陆面能量平衡 Bowen比 

分 类 号：P422[天文地球—大气科学及气象学]