不同陆面方案对珠三角春季晴天边界层特征模拟效果的影响  

Effect of Different Land Surface Schemes on Simulation of Characteristics of Spring Clear Day Boundary Layer in Pearl River Delta Region

作　　者：邹振操 邓院昌[1] 邓治平[1] 

机构地区：[1]中山大学工学院,广东广州510006

出　　处：《中山大学学报（自然科学版）》2015年第3期158-164,共7页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：国家高新技术研究发展计划"863"资助项目(2008AA05Z414)

摘　　要：选用WRF中尺度模式下5种陆面参数化方案(Noah、SLAB、RUC、Pleim-Xiu和SSi B),并结合目前最新陆地覆盖产品Globcover2009,对珠三角地区春季天气个例(2014年04月27日14:00至29日14:00)的大气边界层结构进行模拟试验,同时选取研究区域内18个地面气象站及1个探空站同期实测资料与10 m风速、2 m气温、风温廓线模拟结果进行比较。结果表明:1相比采用USGS土地利用数据,Globcover2009与当前实际地表类型分布情况更相符,通过更新下垫面资料能够有效提高近地面风速和温度的模拟精度;2各陆面方案均基本能够模拟出近地面气象要素的日变化特征,受沿海低平地形影响,各陆面方案下风速被高估的现象均比较明显,而气温则被不同程度低估。其中,SLAB方案模拟10m风速效果最佳,Noah方案模拟2 m温度效果略优,SSi B方案整体模拟效果偏差;3 Noah、SLAB、RUC和Pleim-Xiu方案模拟风温廓线走势基本一致且符合实况,而SSi B方案得到的边界层结构特征不够明显,主要原因是近地面垂直层设置过于稀疏。By using five different kinds of land surface parameterization schemes（ SLAB,Noah,RUC,Pleim-Xiu and SSi B） in WRF model and combining with the latest land cover data Globcover2009,the tests about boundary layer structural features were simulated in the Pearl River delta region from 28 to 29 April 2014. Meteorological parameters,including weed speed at 10 m,temperature at 2 m,vertical profile of wind speed and temperature,were evaluated and compared to the observations from 18 surface weather stations and 1 sounding station in the research area. The results show that：①compared with the USGS land use data,distribution of land use classes in Globcover2009 is more consistent with the current actual type of surface. The simulation precision of wind speed and temperature near the surface can be effectively improved by updating the land use data; ②WRF model can simulate the diurnal variations of surface meteorological parameters basically. Due to the lowly coastal terrain,the simulations of wind speed at 10 m are more easily overestimated from these five schemes,while the results of temperature at2 m are underestimated to various degrees. Among them,the simulation result of wind speed in SLAB scheme is the best and the simulated temperature in Noah scheme is more accurate than others,the error between simulations and observations in SSi B scheme is the biggest.③The vertical profiles of wind speed and temperature obtained by Noah,SLAB,RUC and Pleim-Xiu are almost the same in variation trend and these simulations are in line with the actual situation. The characteristics of atmospheric boundary layer from SSi B scheme are not obvious for the reason that vertical stratification near the ground is set too sparsely.

关 键 词：WRF模式 陆面参数化方案 大气边界层 Globcover2009 珠三角地区 

分 类 号：TM614[电气工程—电力系统及自动化]