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首页> 外文OA文献 >Vertical cloud structure observed from shipborne radar and lidar : Midlatitude case study during the MR01/K02 cruise of the research vessel Mirai
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Vertical cloud structure observed from shipborne radar and lidar : Midlatitude case study during the MR01/K02 cruise of the research vessel Mirai

机译：从舰载雷达和激光雷达观察到的垂直云结构：研究船Mirai在MR01 / K02航行中的中纬度案例研究

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We observed the vertical distribution of clouds over the Pacific Ocean near Japan in May 2001 using lidar and a 95-GHz radar on the Research Vessel Mirai. Cloud analyses derived from synergy use of radar and lidar observations showed that there were two local maxima of cirrus cloud frequency of occurrence at 7 and 10.5 km and the drizzle frequency of occurrence was about the half compared with that of clouds below 4 km. The number of layers could be also measured using these schemes. Single, double, triple, and quadruple (or more) cloud layers had a 48, 23, 7, and 2% probability of occurrence, respectively. The average number of cloud layers when clouds existed was 1.54. The vertical structure of clouds observed with the radar/lidar system was compared to clouds in the aerosol transport model SPRINTARS, which is based on the CCSR-NIES Atmospheric General Circulation Model. The cloud fraction, radar reflectivity factor, and lidar backscattering coefficient were simulated by the model and compared to those by the observations using height-time cross-sections where the radar sensitivity was taken into account. The overall pattern of cloud fraction was well reproduced, although the model underestimated (overestimated) mean cloud fraction below 8 km (above 8 km). Cloud microphysics in the model could also be validated through comparison of derived model radar and lidar signals in grid mean with observations. The model overestimated ice particle size above 10 km, and simulated particle sizes in water clouds of 10 μm were larger than observed.
机译：我们在2001年5月使用激光雷达和研究船Mirai上的95 GHz雷达观察了日本附近太平洋上空云的垂直分布。通过雷达和激光雷达观测的协同使用进行的云分析表明，在7和10.5 km处，卷云的出现频率有两个局部最大值，而毛毛雨的发生频率是4 km以下的云的一半。层数也可以使用这些方案来测量。单，双，三和四（或更多）云层分别具有48％，23％，7％和2％的发生概率。存在云时的平均云层数为1.54。使用雷达/激光雷达系统观测到的云的垂直结构与气溶胶传输模型SPRINTARS中的云进行了比较，该模型基于CCSR-NIES大气总循环模型。该模型模拟了云量，雷达反射率因子和激光雷达后向散射系数，并与考虑了雷达灵敏度的高度-时间横截面与观测值进行了比较。尽管该模型被低估（高估了）低于8 km（高于8 km）的平均云量，但该云量的总体模式得到了很好的再现。该模型中的云微观物理学也可以通过将导出的模型雷达和激光雷达信号在网格均值中与观测值进行比较来验证。该模型高估了10 km以上的冰粒径，而10μm的水云中的模拟粒径比观察到的要大。

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