摘要
应用分裂窗方法反演地表温度的结果表明：地表温度不仅线性地依赖于ＡＶＨＲＲ的４，５通道的亮度温度，而且还线性地依赖于与光谱比辐射率有关的项，即（１－ε４）／ε４及（ε４－ε５）／ε４。分析指出：（１）若Δε（ε４－ε５）＝０，当ε４从０．９４～１．００时，地表温度的变化达３．０℃。（２）当Δε≠０时，Δε对反演地表温度的影响比ε４所造成的影响更敏感、更显著；若Δε＞０，Δε对ε４所造成的影响有减弱作用；若Δε＜０，Δε对ε４所造成的影响有加强作用。（３）要使反演地表温度的误差小于１．０℃，则Δε的误差量级必须小于０．００５。
When using the split-window method for the retrieval of land surface temperature,the results show that the land surface temperature linearly depends not only on the brightness temperatures in channels 4 and 5 of AVHRR but also on the (1-ε 4 )/ε 4 and (ε 4 -ε 5 )/ε 4 which are based on spectral emissivities of channels 4 and 5. The analyzing results are as follows:(1) If Δε(namely,ε 4 -ε 5 )=0,as ε 4 varied from 0.94 to 1.00,the difference between land surface temperatures is more than 3.0 ℃. (2) If Δε≠0,the effect of Δε on the land surface temperature is more sensitive and more notable than that of ε 4 ;When Δε>0,there may be a weaking between the effects of Δε and ε 4 on land surface temperature;But if Δε<0,there is a enhancing between the effects of Δε and ε 4 . (3) If the error of land surface temperature is decreased to lower than 1.0 ℃,then the error of Δε must be less than 0.005.
出处
《高原气象》
CSCD
北大核心
1997年第1期36-44,共9页
Plateau Meteorology
基金
国家攀登项目"青藏高原形成演化
环境变迁与生态系统的研究"资助
关键词
青藏高原
地表温度
光谱比辐射率
遥感
The Qinghai-Xizang Plateau Land surface temperature Spectral emissivity
