鄂尔多斯高原及周边地区地面温度的计算研究

The Research on Calculation of Land Surface Temperature on the Ordos Plateau and the Surroundings

采用一种分裂窗方法，利用ＮＯＡＡ－ＡＶＨＲＲ资料计算了鄂尔多斯高原及周边地区的地面温度。用３、４、５通道的数据计算地面发射率，其后以发射率和４、５通道亮温结合计算地面温度。通过与当地气象站接近时次的实测资料相比，夜间计算差值在±１℃以内的占８０％，白天占６７％，最大差值－３．８℃。作为一种宏观地表监测手段，该方法是可行的。

The land surface temperature of the Ordos Plateau and the surrounding areas is calculated with NOAA-AVHRR data by means of a split-window method. In this method,the surface emissivity is computed first from the brightness temperature of Channels 3,4 and 5,then in conjunction with the emissivity and the brightness temperature of Channels 4 and 5 the land surface temperature is derived. The comparison between the computed results and the observations of local stations at about the same time indicates that the difference is about 80% within 1℃ in the nighttime,but only 67% in the daytime. The maximum difference is - 3.8 C. As a macro-monitoring measure, this method is acceptable in estimating land surface temperature.