遥感结合地面观测估算陆地生态系统蒸散发研究综述

Estimating Terrestrial Ecosystems Evapotranspiration: A Review on Methods of Integrateing Remote Sensing and Ground Observations

地面观测和遥感模拟作为陆地生态系统蒸散发研究的2种基本手段,有着各自的优缺点且存在互补性。因此,有效地将遥感和地面观测站点资料相结合,探讨陆地生态系统蒸散发的时空分布规律及不同尺度转换理论与方法,实现蒸散耗水地面观测结果的尺度扩展和生态需水量估算成为普遍关注的焦点。从遥感与地面观测结合确定陆地生态系统蒸散发入手,论述目前基于该思路的4个方面的进展:①简单经验回归模型;②能量平衡余项法;③陆面过程模式;④陆面数据同化。并探讨遥感结合地面观测估算陆地生态系统蒸散发存在的问题及可能的解决途径。

Generally, the two basic study ways to complete the estimate of terrestrial ecosystems evapotranspiration, ground observation and remote sensing simulation have their own advantages and disadvantages and are complementary to each other. Therefore, how to extend the surface flux （e. g. latent heat flux） from ground observations to large scale （regional and global scale） through combining remote sensing and ground observations has become a scientific focus. In view of this, we review the four aspects of progress based on this research ideas ： pie empirical regression model; ② assimilation, and discuss the main ① simsurface energy balance methods; ③land surface process model; ④ land data problems currently and possible solutions.