Skip to Main content Skip to Navigation
Journal articles

Ultrathin Tropical Tropopause Clouds (UTTCs): I. Cloud morphology and occurrence

Abstract : Subvisible cirrus clouds (SVCs) may contribute to dehydration close to the tropical tropopause. The higher and colder SVCs and the larger their ice crystals, the more likely they represent the last efficient point of contact of the gas phase with the ice phase and, hence, the last dehydrating step, before the air enters the stratosphere. The first simultaneous in situ and remote sensing measurements of SVCs were taken during the APE-THESEO campaign in the western Indian ocean in February/March 1999. The observed clouds, termed Ultrathin Tropical Tropopause Clouds (UTTCs), belong to the geometrically and optically thinnest large-scale clouds in the Earth's atmosphere. Individual UTTCs may exist for many hours as an only 200--300 m thick cloud layer just a few hundred meters below the tropical cold point tropopause, covering up to 105 km2. With temperatures as low as 181 K these clouds are prime representatives for defining the water mixing ratio of air entering the lower stratosphere.
Document type :
Journal articles
Complete list of metadatas

Cited literature [23 references]  Display  Hide  Download

https://hal.archives-ouvertes.fr/hal-00295304
Contributor : Publication Egu <>
Submitted on : Tuesday, July 29, 2003 - 8:00:00 AM
Last modification on : Saturday, October 17, 2020 - 6:44:02 PM
Long-term archiving on: : Friday, May 28, 2010 - 8:03:17 PM

File

acp-3-1083-2003.pdf
Explicit agreement for this submission

Identifiers

  • HAL Id : hal-00295304, version 1

Collections

INSU | EGU

Citation

Th. Peter, B. P. Luo, M. Wirth, C. Kiemle, H. Flentje, et al.. Ultrathin Tropical Tropopause Clouds (UTTCs): I. Cloud morphology and occurrence. Atmospheric Chemistry and Physics, European Geosciences Union, 2003, 3 (4), pp.1083-1091. ⟨hal-00295304⟩

Share

Metrics

Record views

553

Files downloads

320