四川盆地丘陵地区地气相互作用的观测分析

A Study of Monitoring Land-Atmosphere Interaction in Hilly Region of Sichuan Basin Using Large Aperture Scintillometer

根据2000—2001年在四川盆地中部乐至县进行的大口径闪烁仪(LargeApertureScintillometer)外场观测和气象站观测获得的资料,用梯度法和Bruin法分别计算了丘陵地区表征地气相互作用的重要物理量———地表感热通量,并对两种结果(月平均)进行了比较。在此基础上,利用LAS的观测结果对丘陵地区地表感热通量的变化特征进行了分析研究,首次揭示了四川盆地丘陵地区地气相互作用的一些新事实。这些结果对深化不同类型区地气相互作用的认识有重要意义,特别是对气候分析预测、气候数值模式中考虑地气相互作用有一定参考价值。

By using the gradient and Bruin methods, the ground surface sensible flux, which indicates the landatmosphere interaction, is calculated respectively from the Large Aperture Scintillometer observed data and meteorological station data in Lezhi county of Sichuan Basin from 2000 to 2001. The monthly average of the two data is compared carefully. Furthermore, the characteristics of ground surface sensible flux change is analyzed according to the LAS data. Some new truths of landatmosphere interaction have been revealed in hilly region of Sichuan, which can better understand the landatmosphere interaction mechanism of different regions and have a great help especially in numerical weather prediction and climate analyses.