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- Title
Observations of Tropical Tropopause Layer clouds from a balloon-borne lidar.
- Authors
Lesigne, Thomas; Ravetta, François; Podglajen, Aurélien; Mariage, Vincent; Pelon, Jacques
- Abstract
Tropical Tropopause Layer (TTL) clouds have a significant impact on the Earth's radiative budget and regulate the amount 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 t < 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 1 km. Ultrathin TTL cirrus (t < 2 · 10-3) have a significant coverage (16 % of the profiles) and their mean geometrical depth is below 500 m.
- Subjects
TROPOPAUSE; DOPPLER lidar; LIDAR; WATER vapor; STRATOSPHERE
- Publication
Atmospheric Chemistry & Physics Discussions, 2023, p1
- ISSN
1680-7367
- Publication type
Article
- DOI
10.5194/egusphere-2023-2763