能量存储及垂直速度能量输送对绿洲地表能量平衡的贡献

Contribution of energy storage and vertical advection to the surface energy balance over oases

选取"黑河综合遥感联合试验"2008年8月盈科灌区绿洲站植被与其他陆面观测资料,计算夏季地表层能量存储与平均垂直速度能量输送,分析其对地表能量平衡的贡献.结果表明,考虑能量存储后,能量不闭合残差降低,其中当地时间09:00-12:00减小最多;日平均闭合率增加了0.13,07:00-09:00提升0.23,其中0.09来源于植被冠层热存储和光合作用耗能.加入平均垂直速度能量输送后,残差日均方根值减小24.2 W/m^2,12:00-15:00减小最多;日均闭合率增加0.07,15:00-17:00提升0.17,其中0.12来自于平均垂直速度潜热输送贡献.在涡动相关观测中加入平均垂直速度能量输送后,感热通量日均方根值提高了16.5%,潜热通量值增加了7.4%.

With the observational data located in an oasis at the Yingke site irrigation area of Northwest China and supported by the watershed allied telemetry experimental research project, the contribution of each energy storage term and vertical adVection to the surface energy balance was analyzed. The results showed that after considering the total energy storage; the residual of energy balance （RES）was reduced with the maximum reduction between 09：00 and 12：00 of the local time, arid the daily average of energy balance ratio（EBR） increased, by 0.13 with a maximum increase of 0.23 between 07：00 and 09：00 and 0.09 from the canopy heat storage and the energy by photosynthesis. After adding the vertical heat advection into the energy balance cquation, the root mean square of RES in the daily average underwent a reduction of 24.2 W/m^2 with the maximum reduction between 12：00 and 15：00, and EBR increased by 0.07 with the maximum of 0117 between 15：00 and 17：00; and 0.12 from the vertieal latent heat advection. In contrast to the eddy correlation observations, the revised sensible and latent heat fluxes had witnessed reduction of about 16.5% and an increase of about 7.4% with the addition of the vertical sensible and latent heat advection.