Ice water content‐extinction relationships and effective diameter for TTL cirrus derived from in situ measurements during ATTREX 2014

Ice water content‐extinction relationships and effective diameter for TTL cirrus derived from in situ measurements during ATTREX 2014
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ATTREX 2014 期间现场测量得出的冰水含量-消光关系和 TTL 卷云的有效直径

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发表时间:
2017
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影响因子:
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通讯作者:
R. Gao
R. Gao
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文献类型:
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作者:
T. Thornberry;A. Rollins;M. Avery;S. Woods;R. Lawson;T. Bui;R. Gao

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2014 年 1 月至 3 月部署的 NASA 机载热带对流层顶实验 (ATTREX) 在西太平洋上空的热带对流层顶层 (TTL) 中进行了超过 34 小时的卷云采样。整个 TTL 期间都遇到卷云,温度在 185 到 207 K 之间,冰水含量 (IWC) 范围从 >10 mg m−3 到低于仪器检测限 1 μg m−3。根据云粒子探测器测量确定的几何消光 (σ) 值范围为 10−3 m−1 至 <10−7 m−1。在 T > 192 K 时采样的卷云的中位有效直径 (Deff) 为 40–50 μm,表现出较弱的温度依赖性,而低于 192 K 时,Deff 随着 T 的降低而下降得更厉害。从 ATTREX 数据中,导出了 TTL 卷云 IWC-σ 关系的新参数化,这将改进根据这些云的激光雷达和光学探测器观测对 IWC 的估计。
The NASA Airborne Tropical Tropopause Experiment (ATTREX) deployment in January–March 2014 yielded more than 34 h of cirrus cloud sampling in the tropical tropopause layer (TTL) over the western Pacific. Cirrus were encountered throughout the TTL, at temperatures between 185 and 207 K, with ice water content (IWC) ranging from >10 mg m−3 to below the instrumental detection limit of 1 μg m−3. Geometric optical extinction (σ) values determined from cloud particle probe measurements ranged from 10−3 m−1 to <10−7 m−1. The median effective diameter (Deff) for cirrus sampled at T > 192 K was 40–50 μm and exhibited a weak temperature dependence, while colder than 192 K, Deff decreased more strongly with decreasing T. From the ATTREX data, a new parameterization of the IWC‐σ relationship for TTL cirrus is derived that will improve the estimation of IWC from lidar and optical probe observations of these clouds.
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