结合可见光近红外和微波遥感估算藏北高原日蒸散发量

Hourly variation of evapotranspiration estimated by visible infrared and microwave data over the northern Tibetan Plateau

利用FY-2E静止气象卫星可见光近红外和FY-3B极轨气象卫星微波资料,结合地面观测资料,基于陆表能量平衡算法（Surface Energy Balance System,SEBS）,反演了藏北高原地表净辐射、土壤热通量、感热及潜热通量的空间日变化过程.利用那曲高寒气候环境观测站观测资料对结果进行了有效性验证,潜热通量的均方根误差为28.22 W·m-2.此外,还对整个藏北高原夏季空间地表能量分量的条件期望进行统计分析,探讨了该区域不同地表温度对应的有效能量分配方式的统计特征.结果表明,区域总体蒸散发量介于2.0~4.0 mm之间.

The net radiation, ground heat flux, sensible heat flux and latent heat flux over the Northern Tibetan Plateau at different times of the day were estimated by using land surface observation, the surface energy balance system algo- rithm, and FY-2E geostationary meteorological satellite visible infrared and FY-3B polar-orbiting satellite microwave re- mote data. The results from the model agree well with the ground observations from Naqu Alpine Climate Stations with 28.22 W ·m-2 RMSE in hourly scale. The condition expectation of surface energy components during the summer time of the Northern Tibet were analyzed, and different surface temperature corresponds to the effective energy distribution were also discussed. The results shows regional ET was ranged between 2.0 - 4.0 mm over the Northern Tibetan Plateau.