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A number of field-campaigns in the tropics have been conducted in recentyears with two different LIDAR systems at Paramaribo (5.8° N,55.2° W), Suriname. The lidars detect particles in the atmosphere withhigh vertical and temporal resolution and are capable of detecting extremelythin cloud layers which frequently occur in the tropical tropopause layer(TTL). Radiosonde as well as operational ECMWF analysis showed thatequatorial Kelvin waves propagated in the TTL and greatly modulated itstemperature structure. We found a clear correlation between the temperatureanomalies introduced by these waves and the occurrence of thin cirrus in theTTL. In particular we found that extremely thin ice clouds form regularlywhere cold anomalies shift the tropopause to high altitudes. These findingssuggest an influence of Kelvin wave activity on the dehydration in the TTLand thus on the global stratospheric water vapour concentration

Correlation between equatorial Kelvin waves and the occurrence of extremely thin ice clouds at the tropical tropopause