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题名 利用激光雷达资料模拟气溶胶辐射效应的大气边界层响应
姓名 胡向军
院系 大气科学学院
专业 大气物理学与大气环境
学位名称 理学硕士
外文题名 Numerical Simulation of Atmospheric Boundary Layer Response to Aerosol Radiative Effect Using Lidar Measurements
第一导师姓名 张镭
关键词 WRF模式;气溶胶辐射效应;激光雷达;大气边界层;数值模拟
外文关键词 WRF model;aerosol radiative effect;lidar;ABL;numerical simulation
学科 理学
摘要   本文采用新型激光雷达气溶胶探测资料和综合数值模式,以复杂地形的兰州市及周边地区冬季典型天气形势下的大气边界层为研究对象,通过理想试验研究了城市气溶胶辐射效应与大气边界层的相互作用问题。在已有工作的基础上,将具有多重嵌套功能的WRF (Weather Research and Forecast) v2.1模式与包含了大气气溶胶辐射效应的大气边界层耦合模式嵌套起来,构成新的WRF_ABL模式系统。在对模式系统进行充分验证的基础上,应用CAMLTM CE370-2后向散射激光雷达的探测资料,对2005年兰州冬季的烟雾层气溶胶辐射效应及大气边界层的响应情况进行了模拟计算和理论分析。本文工作改进了已有的大气边界层耦合模式系统,对激光雷达探测资料在边界层模式系统中的应用进行了尝试,对烟雾层气溶胶辐射效应及大气边界层的响应问题进行了有益的探索。   首先,使用1989年NNRP2资料和1989年12月兰州城区大气边界层外场观测试验资料,对WRF v2.1模式进行了验证,结果表明,模式对气象场模拟性能良好,具有较好的稳定性。然后,采用将验证过的WRF v2.1模式和大气边界层模式嵌套起来,对兰州地区冬季供暖期典型天气形势下的大气边界层结构进行了数值模拟和个例分析,得到了兰州冬季的大气风、温场结构和分布特征,结果表明嵌套方案对大气边界层模拟能力较好,模拟结果与现有观测及理论较为相符,可以应用于兰州地区冬季烟雾层的研究。最后,利用已建立的与WRF v2.1模式嵌套的考虑了气溶胶的长波和短波辐射效应的边界层模式系统,利用激光雷达气溶胶探测资料,通过对2005年兰州冬季的个例计算分析,讨论了2005年兰州冬季的气溶胶辐射效应对边界层结构的定量影响。主要特征为,夜间气溶胶的长波辐射效应使50~600m高度内大气温度在1h内降低约0.13~0.18℃。风速在50~450m层内减小,减小约0.1m/s。白天气溶胶的短波辐射效应使地面层内增温,温度从地面至50m在1h内增加约0.65℃,50~600m高度层内增加量较大,约1.2℃,增温最大值在300m高度附近,为1.68℃。受增温影响,风场随之调整,风速在100m以下增大0.025m/s左右,而在100~750m高度风速有不同程度的减小,平均为0.22m/s,其中最大减小值在300m高度,为0.6m/s左右。
外文摘要   Using new lidar data and a comprehensive model system through idealized numerical experiments, it was investigated that the interaction between urban aerosol radiative effect and atmospheric boundary layer (ABL) in the typical winter weather condition of Lanzhou over complex terrain. Based on the previous researches, the WRF v2.1, version 2.1 with multinest of nonhydrostatic numerical model WRF, was coupled with the ABL model, in which the radiative effect of urban aerosol particles is considered. And they constituted the WRF_ABL model system. After verifying the model sufficiently, the paper performed the numerical simulations and theoretical analyses of the smog aerosol radiative effect as well as the ABL response in Lanzhou in winter 2005 by using the data of backscatter lidar CAMLTM CE370-2. The work improved the WRF_ABL model system, and had a numerical experiment of the lidar data in the WRF_ABL model system. A valuable explore to investigate the smog aerosol radiative effect and ABL response had been made.   First of all, by using the data of NNRP2 and the ABL measurement campaign during December 1989 in Lanzhou city, the verification of WRF v2.1 model system was worked out. It showed that the model could run steadily and the performance of the simulation of meteorological fields was preferable. Secondly, the WRF v2.1 model was coupled with the ABL model through the nesting scheme. The numerical simulation and case analysis of the ABL structure were performed in the winter heating period of Lanzhou. The results showed that, the simulation was substantially reasonable, and the model was able to be used in investigation of the smog aerosol radiative effects in Lanzhou in winter. Finally, employing the established WRF v2.1 model integrated with the ABL model and in consideration of the radiative effect of atmospheric aerosol, a case analysis on the quantitative influence of the aerosol radiative effect on boundary layer structure of Lanzhou in winter 2005 was discussed by using the lidar data. The primary characteristic was that the long wave radiative effect of aerosol led the lower layer (50~600m) cooling with 0.13~0.18℃/h at night. The wind speed decreased between 50~450m level, the value was 0.1m/s. During daytime, there was an obviously heat increasing in ABL due to the aerosol short wave radiative effect with the increment of about 0.65℃/h below 50m, and about 1.2℃/h in 50~600m. The maximum of the temperature increase occurred ne...
研究领域 大气边界层与大气扩散
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