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首页> 外文期刊>Journal of the Atmospheric Sciences >Observations of the structure of heavily precipitating marine stratocumulus
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Observations of the structure of heavily precipitating marine stratocumulus

机译：严重降水的海洋层积云结构的观测

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The second research flight of the Second Dynamics and Chemistry of Marine Stratocumulus (DYCOMS-II) field study is analyzed. This case attracted attention because it combined the presence of high drizzle rates with the occurrence of clearings in the cloud cover, which previous work has suggested could be due to a drizzle-induced change in cloud structure. Recent work has named the configuration of these open-cell-like features pocket of open cells (POC). A division of the data, based on the difference of brightness temperature of the 11- and 4-mu m channels of the Geostationary Operational Environmental Satellite-10 (GOES-10), is used to condition averages over POC and non-POC sections of the data. Based on this division, significant precipitation is observed almost entirely within the POC. Overall, the observed PBL was markedly energetic and well mixed, commensurate with observations of similarly forced nonprecipitating boundary layers. Regions of elevated equivalent potential temperature, Theta(e), are encountered in association with the POC and are particularly pronounced below cloud in regions of active precipitation. In the same areas, evaporative cooling and moistening of the subcloud layer air and a marked reduction of the vertical velocity variance below cloud is noted. The POC, and in particular the drizzling areas in the POC, have a mean upward velocity, while the non-POC is associated with descending air. In addition to exhibiting more mesoscale variability the POC differs microphysically from the non-POC: in the POC liquid water amount is higher, cloud droplet number concentration lower, and the effective radii larger. Factors maintaining regions of elevated Theta(e) are discussed, and targets for future modeling or observational studies are identified.
机译：分析了“海洋层积云第二动力学和化学”（DYCOMS-II）的第二次研究飞行。该案例引起了关注，因为它结合了高毛毛雨发生率和云层中出现空旷的情况，以前的工作表明这可能是由于毛毛雨引起的云结构变化。最近的工作已将这些类似开孔特征的配置命名为“开孔”（POC）。根据对地静止作战环境卫星10（GOES-10）的11微米和4微米通道的亮度温度的差异，对数据进行划分，以求取POC和非POC部分的平均值数据。基于此划分，几乎完全在POC内观察到大量降水。总体而言，观察到的PBL充满活力并且混合得很好，与对类似受迫的非沉淀边界层的观察结果相当。与POC结合时会遇到等效电位温度Theta（e）升高的区域，在活跃降水区域的云层以下尤其明显。在相同的区域，注意到亚云层空气的蒸发冷却和湿润以及云层以下的垂直速度方差显着降低。 POC，特别是POC中的毛毛雨区域，具有平均上升速度，而非POC与下降的空气相关。除了表现出更多的中尺度变化外，POC在微观上与非POC有所不同：POC中的液态水量较高，云滴数浓度较低，有效半径较大。讨论了维持Theta（e）升高区域的因素，并确定了未来建模或观察研究的目标。

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