Tropical tropopause layer cirrus and its relation to tropopause
MetadataShow full item record
This study examines the spatial and temporal patterns of tropical tropopause layer (TTL) cirrus clouds (i.e., clouds with bases higher than 14.5 km) and their relationship to tropical tropopause including both cold point tropopause (CPT) and lapse rate tropopause (LRT). We use eight years (2006–2014) data from the Cloud–Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) and Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC) measurements. In addition to the CALIPSO cloud layer product, the clouds included in the current CALIPSO dataset as stratospheric features have been considered by separating clouds from aerosols, which are important in the TTL cloud analysis. It is also shown that the temporal variation of the stratospheric aerosols matches well with the volcanic eruption events.The TTL cloud fraction and the tropical tropopause temperature both have pronounced annual cycles and are strongly negatively correlated both temporally and spatially. The examination of the TTL cloud height relative to tropopause from collocated CALIPSO and COSMIC observations indicates that the tropopause plays a critical role in constraining the TTL cloud top height. We show that the probability density function of TTL cloud top height peaks just below the CPT while the occurrence of TTL clouds with cloud tops above the CPT could be largely explained by observed tropopause height uncertainty associated with the COSMIC vertical resolution.
- Atmospheric sciences 
Showing items related by title, author, creator and subject.
Mullendore, Gretchen Louise (2003)Simulations performed by a 3D cloud-resolving model are used to study the transport of tropospheric tracers into the lowermost stratosphere via midlatitude convection. Direct transport by convection is believed to be the ...
Dinh, Tra Phuong (2012-08-10)Simulations of tropical-tropopause-layer (TTL) cirrus under the influence of a large-scale equatorial Kelvin wave have been performed in two dimensions. These simulations show that, even under the influence of the large-scale ...
On the mechanism of the large-scale seasonally varying upwelling in the region of the tropical tropopause Yulaeva, Elena Valentinovna (1997)This work investigates the physical mechanisms that determine the large-scale upwelling through the tropical tropopause, one of the principal components of stratosphere-troposphere mass exchange. The global-scale mean ...