摘要
文中利用单时相双光谱分裂窗算法以GMS 5/VISSR红外资料反演地表温度,揭示了中国几类典型下垫面晴空地表温度的日变化及季节变化特征.塔里木盆地、青藏高原、浑善达克沙地、华北平原北部、华南部分地区因地表反射率、土壤含水量、受太阳辐射影响程度不同等地表温度季节变化差异很大,月平均地表温度日较差一年内基本上呈双峰双谷型.作为比较,东亚部分陆地的地表温度与台湾海峡南部、黄海的海表温度及其日变化、季节变化一并进行了分析.塔里木盆地、浑善达克沙地不仅具有强烈的日变化,而且季节变化也显著.2000年两地月平均地表温度日较差最大值超过30 K,浑善达克沙地的年较差高达58.50 K.青藏高原地表温度季节变化小于东亚部分陆地、塔里木盆地、浑善达克沙地,但该区日变化幅度在所研究几个区中最大,2000年年平均日较差达28.05 K.文中将研究时段扩充到1998~2000年后揭示了连续三年地表温度及其日变化的年际变化特征.所获得这几类地表温度的变化特征与量值对于气候与辐射收支研究以及推测地表状况会有一定参考价值.
The retrieved results by GMS 5/VISSR thermal infrared data with single time/dual channel split-window algorithm reveal the characteristics of diurnal and seasonal variation of clear-sky land surface temperature(LST)of several representative land surface types in China,including Talimu Basin,Qinghai-Tibet Plateau,Hunshandake Sands,the northern Plain of China and the southern China.The seasonal variation of clear-sky LST in above areas varies distinctly for different surface albedo,soil water content and the extent of influence by solar radiation.The monthly average diurnal ranges of LST have two peaks and two valleys in one year.The characteristics of LST in most land of East Asia and that of sea surface temperature(SST)in the south of Taiwan Strait and the Yellow Sea were also analyzed as comparison.Talimu Basin and Hunshandake Sands have not only considerable LST diurnal cycle but also have remarkable seasonal variation.In 2000,the maximum monthly average diurnal ranges of LST in both areas are over 30 K,and the annual range in Hunshadake Sands reaches 58.50 K.Seasonal variation of LST in Qinghai-Tibet Plateau is less than those in East Asia,Talimu Basin and Hunshandake Sands.However,the maximum diurnal range exists in this area.The yearly average diurnal range is 28.05 K in 2000.The characteristics of diurnal,seasonal and annual variation from 1998 to 2000 were also shown in this research.All of the results will be valuable to the research of climate change,radiation balance and estimation for the change of land surface types.
作者
王旻燕
吕达仁
Wang Minyan;Lu Daren(LAGEO,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029)
出处
《气象学报》
CAS
CSCD
北大核心
2005年第6期957-968,共12页
Acta Meteorologica Sinica
基金
国家自然科学基金(49790020,40027002)
科技部基础预研专项(2001CCA02200)
关键词
GMS
5
地表温度
日变化
季节变化
GMS 5
Land Surface Temperature
Diurnal and seasonal variation
