青藏高原土壤冻融对地表辐射特征的影响分析  

EFFECT OF SOIL FREEZING AND THAWING ON SURFACE RADIATION OVER QINGHAI-TIBET PLATEAU

作　　者：尚伦宇[1] 吕世华[1] 李锁锁[1] 孟宪红[1] 奥银焕[1] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所西部气候环境与灾害实验室,兰州730000

出　　处：《太阳能学报》2010年第1期12-16,共5页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(40575032);成都高原气象研究所基础科研项目(BROP200712)

摘　　要：利用黄河源区气候与环境综合观测研究站.2006年10月1日～2007年4月30日的辐射和5cm土壤温度和湿度资料研究了土壤冻融对地表辐射特征的影响,结果表明:土壤冻结降低了土壤中的液态水含量,致使冻结阶段地表反照率大于冻结前的值,也大于土壤融化后的值;受总辐射和地表反照率共同作用,整个冻融过程中反射辐射可区分为两个比较明显的阶段;土壤冻结减缓了地表温度降低的速率,相应地减缓了地表长波辐射和大气逆辐射降低的速率;整个冻融过程中净辐射变化与总辐射的变化比较相近,在冻结阶段,地表反照率大于冻结前的值,也大于融化后的值,因此冻结阶段的净辐射值也更小一些。Using the observations of radiation, soil temperature and moisture from Oct. 1, 2006 to Apr. 30, 2007 in Maqu station, the effects of soil freezing and thawing on surface radiation were analyzed. The main results showed that volumetric soil liquid water content comes down rapidly when soil freezing happened caused surface albedo to raise. The change of surface reflection radiation can be divided into two different phases. Surface temperature, upward longwave ra-diation and downward longwave radiation represent decreasing tendencies, this decreasing becomes gently when soil freez-ing happened . Net radiation and global radiation shared similar changes.

关 键 词：青藏高原 土壤冻融 反照率 地表辐射特征 

分 类 号：TK512.4[动力工程及工程热物理—热能工程]