Observations of Tropical Tropopause Layer clouds from a balloon-borne lidar

IF 5.2 1区地球科学 Q1 ENVIRONMENTAL SCIENCES

Atmospheric Chemistry and Physics Pub Date : 2023-11-23 DOI:10.5194/egusphere-2023-2763

Thomas Lesigne, Francois Ravetta, Aurélien Podglajen, Vincent Mariage, Jacques Pelon

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Abstract

Abstract. Tropical Tropopause Layer (TTL) clouds have a significant impact on the Earth’s radiative budget and regulate the amount of water vapor entering the stratosphere. During the Strateole-2 observation campaign, three microlidars were flown onboard stratospheric superpressure balloons from October 2021 to late January 2022, slowly drifting only a few kilometers above the TTL. These measurements have unprecedented sensitivity to thin cirrus and provide a fine-scale description of cloudy structures both in time and space. Case studies of collocated observations with the space-borne lidar Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) show a very good agreement between the instruments and highlight the unique ability of the microlidar to detect optically very thin clouds below CALIOP detection capacity (optical depth τ < 2 · 10⁻³). Statistics on cloud occurrence show that TTL cirrus appear in more than 50 % of the microlidar profiles and have a mean geometrical depth of 1 km. Ultrathin TTL cirrus (τ < 2 · 10⁻³) have a significant coverage (16 % of the profiles) and their mean geometrical depth is below 500 m.

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用气球载激光雷达观测热带对流层顶云层

摘要热带对流层顶(TTL)云对地球的辐射收支有重要影响，并调节进入平流层的水蒸气量。在stratole -2观测活动期间，从2021年10月到2022年1月下旬，三个微激光雷达被放置在平流层超压气球上，缓慢地在TTL上方几公里处漂移。这些测量对薄卷云具有前所未有的灵敏度，并在时间和空间上提供云结构的精细描述。用星载激光雷达正交偏振云气溶胶激光雷达(CALIOP)进行的配位观测的实例研究表明，仪器之间的一致性非常好，并突出了微激光雷达探测光学极薄云的独特能力，低于CALIOP探测能力(光学深度τ <2·10−3)。云的发生统计表明，TTL卷云出现在50%以上的微激光雷达剖面中，平均几何深度为1 km。超薄TTL卷云(τ <2·10−3)具有显著的覆盖范围(16%的剖面)，其平均几何深度低于500 m。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Atmospheric Chemistry and Physics 地学-气象与大气科学

CiteScore

10.70

自引率

20.60%

发文量

702

审稿时长

6 months

期刊介绍： Atmospheric Chemistry and Physics (ACP) is a not-for-profit international scientific journal dedicated to the publication and public discussion of high-quality studies investigating the Earth''s atmosphere and the underlying chemical and physical processes. It covers the altitude range from the land and ocean surface up to the turbopause, including the troposphere, stratosphere, and mesosphere. The main subject areas comprise atmospheric modelling, field measurements, remote sensing, and laboratory studies of gases, aerosols, clouds and precipitation, isotopes, radiation, dynamics, biosphere interactions, and hydrosphere interactions. The journal scope is focused on studies with general implications for atmospheric science rather than investigations that are primarily of local or technical interest.