High Altitude Lidar Observations of Marine Stratocumulus Clouds

R. Boers, J. Spinhirne, W. Hart
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引用次数: 0

Abstract

The present study describes the cloud top structure of an East Pacific marine stratocumulus cloud layer as observed from a downward-pointing lidar system aboard the NASA ER-2 aircraft. The lidar observations were coordinated with in situ observations of cloud parameters. These data are applied to study important statistical properties of the stratus clouds. The study of cloud top structures is highly relevant for detailed radiation budget calculations. Because large gradients in temperature and humidity exist near the cloud top, cloud top emmitted radiation varies significantly in the vertical. Precise knowledge of cloud top location allows for a precise determination of cloud top cooling and thus determines an important loss/gain in the atmospheric thermodynamic energy budget. Cloud top topography and periodic structures influence the solar reflectance and therefore the albedo of the clouds.
海洋层积云的高空激光雷达观测
本研究描述了从NASA ER-2飞机上的向下指向激光雷达系统观测到的东太平洋海洋层积云云层的云顶结构。激光雷达观测与云参数的现场观测相协调。这些数据被用于研究层云的重要统计特性。云顶结构的研究与详细的辐射收支计算高度相关。由于云顶附近存在较大的温度和湿度梯度,云顶辐射在垂直方向上变化较大。对云顶位置的精确了解可以精确确定云顶冷却,从而确定大气热力学能量收支中的重要损失/收益。云顶地形和周期性结构影响太阳反射率,从而影响云的反照率。
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