气候动力降尺度方法在复杂下垫面的应用研究  

Application research into climate dynamical downscaling over a complex terrain

作　　者：王雅萍[1] 张武[1] 黄晨然 

机构地区：[1]兰州大学大气科学学院,半干旱气候变化教育部重点实验室,兰州730000

出　　处：《兰州大学学报（自然科学版）》2015年第4期517-525,共9页Journal of Lanzhou University(Natural Sciences)

基　　金：国家重大科学研究计划项目(2012CB955302);公益性行业(气象)科研专项经费项目(GYHY201306006)

摘　　要：在传统的以不断更新侧边界场而只进行一次初始场输入的动力降尺度基础上,利用中尺度天气预报模式设计了不同频次初始场的输入,以期检验其在复杂下垫面下的一个站点(SCAOL站)范围的模拟效果,从而改进该站长时间积分模拟的有效性.加入了中尺度天气预报模式自带的分析松弛研究其模拟效果.结果表明4种方案对地面向上2 m处的温度和相对湿度的模拟要优于对10 m处风速的模拟."分析松弛"表现出了对地面相对湿度模拟很好的改善,却不适宜对地表热量通量的模拟,且对10 m处风速的模拟结果变化平缓;增加初始场输入频次对地表热量通量的模拟有改善,对其他3个变量的模拟结果影响不明显.The weather research and forecast model with different frequencies of initial field updating was used to examine a single observation point＇s （SACOL） simulation results. Using the method in four manners produced a better result in improving the surface relative humidity but not the surface heat flux, and showed a gentle variation characteristic compared with general circulation models, but further research into a long-term climate simulation is still needed because of accumulated system errors. Based on the traditional way of dynamical downscaling with continuous lateral boundary conditions, updating only one time of the initial field temperature and surface relative humidity with the wind speed at 10 m plus the ＇nudging＇ produced especially a trend result compared with the observation data. It at 2 m also indicated that there was no obvious change after re-initializing the heat flux simulation.

关 键 词：动力降尺度 中尺度天气预报模式 复杂下垫面 初始场 松弛逼近 

分 类 号：P409[天文地球—大气科学及气象学]