摘要
采用FAO Penman-Monteith(P-M)模型,结合多源遥感数据,实现空间尺度上的扩展,对三江平原生长季(5—9月)不同气象条件和不同下垫面条件下的日实际蒸散量进行了估算,并利用波文比观测数据对模拟结果进行了验证。结果表明:(1)观测站日实际蒸散发的模拟值与实测值较为一致,R2达到0.824,RMSE为0.493,研究所采用的基于遥感驱动的PM模型适用于三江平原日蒸散发的估算。(2)生长季内,三江平原的月蒸散发量呈单峰性分布,7月达到峰值;蒸散发量的空间分布与植被盖度和水分供给状况密切相关。(3)净辐射和气温是影响三江平原实际蒸散发的两个主要因子,其次为比湿和风速,此外,降水可以明显增加实际蒸散量,是影响区域蒸散发的关键因素。
FAO Penman-Monteith model is employed to estimate daily evapotranspiration in growing season（May to September） in the Sanjiang Plain using the multi-source remote sensing data.The estimation is validated with Bowen ratio data.Results show that（1） The model simulations meet the observed data well,with a correlation coefficient of 0.824 and RMSE of 0.493,respectively.（2） In growing season,monthly evapotranspiration in the Sanjiang Plain has a unimodal distribution in temporal and reached a peak in July.The spatial distribution of the actual evapotranspiration is affected by vegetation cover and rainfall amounts.（3） Net radiation and air temperature are the two main factors affecting the variation of daily evapotranspiration rate in the Sanjiang Plain,then are specific humidity and wind speed.Rainfall is the key factor affecting regional evaporation and it can significantly increase the amount of actual evapotranspiration.
出处
《水土保持研究》
CSCD
北大核心
2013年第3期190-195,共6页
Research of Soil and Water Conservation
基金
国家自然科学基金资助项目(40930740)
中央级公益性科研院所基本科研业务费专项资金(HKY-JBYW-2013-221)
