Remote Sensing of Sea Salt Aerosol below Trade Wind Clouds
Remote Sensing of Sea Salt Aerosol below Trade Wind Clouds
复制标题
信风云下方海盐气溶胶的遥感
DOI：
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发表时间：
2019
影响因子：
3.1
通讯作者：
B. Stevens
中科院分区：
文献类型：
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作者：
M. Klingebiel;V. Ghate;A. K. Naumann;F. Ditas;M. Pöhlker;C. Pöhlker;K. Kandler;Heike Konow;B. Stevens
海盐气溶胶在边界层下面的浅积云是远程观测与Ka波段云雷达在巴巴多斯云观测站，并检测到76%的测量超过1年。通过对流携带，直径大于500 nm的海盐粒子在两天的个例研究中显示出在浅积云下方0.2 m s−1的向上运动。由于相对湿度随着海拔的增加而增加，海盐颗粒随着它们靠近云底而变得更大。利用Ka波段云雷达和拉曼激光雷达的联合测量，反演的海盐粒子等体积直径在6 ~ 11 μm之间，云底附近海盐粒子数浓度为20 cm−3。假设一个固定的形状参数，海盐粒子的尺寸分布在云底以下的高相对湿度条件下的估计和同意所采取的干沉降采样器和在线气溶胶观测的测量。本文概述的方法可用于未来的研究，以更好地了解垂直和时间的海盐分布在边界层和海盐气溶胶-云相互作用过程。
Sea salt aerosol in the boundary layer below shallow cumulus clouds is remotely observed with a Ka-band cloud radar at the Barbados Cloud Observatory and is detected in 76% of the measurements over 1 year. Carried by convection, sea salt particles with a diameter larger than 500 nm show an upward motion of 0.2 m s−1 below shallow cumulus clouds for a 2-day case study. Caused by an increasing relative humidity with increasing altitude, the sea salt particles become larger as they move closer to the cloud base. By using combined measurements of a Ka-band cloud radar and a Raman lidar, the retrieved equivolumetric diameter of the hygroscopically grown sea salt particles is found to be between 6 and 11 μm with a total number concentration of 20 cm−3 near cloud base. Assuming a fixed shape parameter, a size distribution of sea salt particles under high-relative-humidity conditions below cloud base is estimated and agrees with measurements taken by a dry-deposition sampler and online aerosol observations. The methods outlined in this paper can be used in future studies to get a better understanding of the vertical and temporal sea salt distribution in the boundary layer and sea salt aerosol–cloud interaction processes.
影响因子：
2.2
作者：
O'Connor, Ewan J.;Illingworth, Anthony J.;Brooks, Barbara J.
通讯作者：
Brooks, Barbara J.