WRF中三种边界层参数化方案对新疆“2·28”大风过程模拟的对比分析  

Evaluation of Three Planetary Boundary Layer Parameterization Schemes in WRF Model for the February 28th, 2007 Gust Episode in Xinjiang

作　　者：马媛媛[1] 杨毅[1] 胡小明 戚友存[3] 张曼[3] 

机构地区：[1]兰州大学大气科学学院甘肃省干旱气候变化与减灾重点实验室,甘肃兰州730000 [2]Center for Analysis and Prediction of Storms,University of Oklahoma [3]南京信息工程大学大气科学学院,江苏南京210044

出　　处：《沙漠与绿洲气象》2014年第3期8-18,共11页Desert and Oasis Meteorology

基　　金：国家自然基金(41375109;41175092);兰州大学中央高校基本科研业务费专项资金(lzujbky-2013-111)共同资助

摘　　要：许多研究调查了模式预报对边界层方案的敏感性,这些研究基本上针对的是热力驱动的混合边界层。对于动力驱动的边界层,不同边界层方案的性能及其对边界层气象要素的预报效果还不清楚。运用WRF3.4.1中三种边界层参数化方案(YSU、MYJ、ACM2)对新疆"2·28"大风过程进行数值模拟,结果显示:三种边界参数化方案能模拟出发生大风的区域、大风过程中10 m风速、2 m温度和比湿的变化趋势;三种方案对边界层内大气的温度、湿度的模拟差异与它们对边界层顶的夹卷过程、边界层内垂直混合的处理有关;YSU方案的模拟结果显示更多的高空动量下传,更多的有效位能转化为动能;MYJ方案模拟大风区域更大,受地形影响更明显。Although many studies have investigated the sensitivity of mesoscale models forecastwith different Planet Boundary Layer （PBL） parameterization schemes, they mostly focus on mixedPBL driven by heat. The features and performance of different PBL parameterization schemes for themechanically driven boundary layer have not been fully understood yet. The numerical simulationswere conducted with the Weather Research and Forecasting （version 3.4.1 ） model to analyze a gustprocess that occurred in Xinjiang on February 28th,2007,based on three different PBL schemes. Itshows that these three different PBL schemes can reasonably simulate the area of the gust and thetrend of wind speed at 10 m above ground level. The differences of vertical mixing and entrainmentof air above the PBL are the main reasons for the differences of analog results of temperature andhumidity in PBL among the three schemes. The result of YSU scheme indicates more downwardmomentum flux from upper air and more effective potential energy transformed into kinetic energy,while the area of the gust is larger simulated by MYJ when compared with YSU and ACM2.

关 键 词：WRF模式 边界层参数化方案 大风过程 动力作用 

分 类 号：P456.7[天文地球—大气科学及气象学] P458.123