WRF模式参数化方案对滨海某厂址风场模拟的适用性分析  

Applicability Analysis of WRF Model Parameterization Schemes to Wind Field Simulation for a Coastal Site

作　　者：郭欢 徐向军[1] 牛嫣静 陈龙泉[1] Guo Huan;Xu Xiangjun;Niu Yanjing;Chen Longquan(China Institute for Radiation Protection,Taiyuan,Shanxi,030006)

机构地区：[1]中国辐射防护研究院,太原030006

出　　处：《辐射防护通讯》2019年第4期13-22,共10页Radiation Protection Bulletin

摘　　要：WRF模式对低层风场的模拟效果与边界层和陆面过程参数化方案的选择密切相关。为了寻找在不同的气候背景下适合滨海某厂址的最优风场模拟方案,选取WRF模式中通用的几种边界层方案(YSU、ACM2、MYNN 2.5)和陆面过程参数化方案(RUC、Noah、Pleim-Xiu)进行组合,设计了9组试验,对所选厂址2016年1月(冬季)、4月(春季)、7月(夏季)和10月(秋季)4个代表月的风场进行模拟,并与厂址的10、30、50、70、100 m塔层风观测数据进行对比。结果表明:①9组方案均能模拟出风速的逐日变化趋势且模拟风速值偏高,1月、4月、7月和10月的风速均方根误差分别为2.61~2.95、2.47~3.13、2.78~3.45、3.34~3.77 m/s,平均绝对误差分别为2.27~2.64、2.04~2.63、2.21~2.92、3.09~3.52 m/s;②模拟风玫瑰图均与实测较吻合;③1月、4月和10月风速模拟最优组合均为MYNN2.5+Pleim-Xiu,7月风速模拟最优组合为YSU+Pleim-Xiu;④9组方案之间对风向的模拟差异不大;⑤对该滨海厂址区域进行风场模拟时,选用陆面过程参数化方案中的Pleim-Xiu方案较合适,在此种情况下合理选择边界层方案可以提高模拟结果的准确性。The simulation effect of WRF model on the low-level wind field is closely related to the choice of parameterization schemes for the boundary layer and land surface processes.To find an optimal wind field simulation scheme suitable for a certain coastal site under different climatic backgrounds,9 sets of experiments were designed by combining several commonly used boundary layer schemes(YSU,ACM2,MYNN 2.5)and land surface process parameterization schemes(RUC,Noah,Pleim-Xiu)in the model.The wind field in four representative months,namely,January(winter),April(spring),July(summer)and October(autumn)of 2016,was simulated,and compared with the wind observation data of 10,30,50,70 and 100 m tower layer at the site.The results show that:1)All 9 schemes can simulate the daily variation trend of wind speed and the simulated value is slightly high.For the wind speed in January,April,July and October,the root mean square error is respectively 2.61-2.95 m/s,2.47-3.13 m/s,2.78-3.45 m/s and 3.34-3.77 m/s,while the average absolute error is 2.27-2.64 m/s,2.04-2.63 m/s,2.21-2.92 m/s,3.09-3.52 m/s respectively.2)The simulated wind rose diagrams are in good agreement with the actual measurements.3)The optimal wind speed simulation combination is MYNN 2.5+Pleim-Xiu in January,April and October,and YSU+Pleim-Xiu in July.4)There is little difference in the wind direction simulation between the schemes.5)Pleim-Xiu in the land surface process parameterization schemes is more appropriate for the wind field simulation of this site.In the case,the accuracy of simulation results can be improved by choosing reasonable boundary layer schemes.

关 键 词：WRF模式 低层风场 边界层 陆面过程 参数化 

分 类 号：P456.7[天文地球—大气科学及气象学]