摘要
针对遥感在面上计算的特点,将模式模拟的气象要素区域分布替代以往使用的单点观测值作为遥感估算蒸散发模型的初始场,引入到SEBS(Surface Energy Balance System)模型中,利用EOS/MODIS遥感资料对金塔绿洲非均匀下垫面地表能量通量进行了估算。对比估算结果与实测值表明,引入数值模拟结果后,绿洲地表感热通量的估算误差平均减小了5.8%,潜热通量的误差平均减小了5.5%,说明数值模拟结果的引入比较成功。通过分析地表通量的区域分布特征表明,数值模拟结果的引入在一定程度上更加细致地刻画了荒漠绿洲能量平衡的分布特征,在戈壁荒漠地区,潜热通量非常小,而绿洲集中的地区及水库附近出现了潜热通量的极大值。
The satellite remote sensing retrievals are based on pixel by pixel, but it is quite difficult to obtain some atmospheric parameters such as air temperature and air pressure using the remote sensing technique and field campaign, while numerical modeling can provide them easily. So, the atmospheric pa- rameters from mesoscale model simulation are corrected using the filed observation and then are applied in the estimation of evapotranspiration using EOS/MODIS data. Validation results show that the estimation error of sensible heat flux decreased 5.8 % and error of latent heat flux decreased 5.5 ~//00 using the numeric results comparing with the single observation, all errors are less than 10~//00, which indicate that the land surface flux could be retrieved successfully using the SEBS model. Analysis on the distribution of the land surface heat flux displays that the introduction of numerical simulation improves the description on the characteristics of energy balance in the oasis and the deserts. Latent heat flux is little in the deserts and Gobi, while it is greater in the oasis and water.
出处
《高原气象》
CSCD
北大核心
2012年第4期910-919,共10页
Plateau Meteorology
基金
国家自然科学基金项目(40805002
40905006)
中国科学院"西部之光"培养计划"西部博士资助项目"(290828961)共同资助
关键词
地表能量通量
蒸散发
遥感反演
金塔绿洲
数值模拟
Land surface heat flux Evapotranspiration Satellite remote sensing retrieval JiataOasis Numerical simulation