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Science Rendezvous > Posters Low-ozone bubbles observed in the TTL during TC4 campaign. I. Petropavlovskikh(1), K. Rosenlof (2), E. Ray (1), L. Pfister (3), R. Shetter (4), S. Hall (4), J. Hair (5), M. Fenn (5), M. Avery (5) CIRES/ESRL, USA, (2) NOAA/ESRL, USA, (3) NASA/Ames, USA, (4) UCAR/NCAR, USA, (5) NASA/Langley and SSAI, US. In the summer of 2007 the NASA DC8 aircraft took part in the Tropical Composition, Clouds and Climate Coupling (TC4) campaign based in Costa Rica. Multiple in-situ and remote-sensing instruments aboard the aircraft were set to measure atmospheric composition of the TTL. The partial ozone column above the aircraft products were derived from the CCD Actinic Flux Spectrometer (CAFS) instrument (R. Shetter, NCAR) measurements as part of the continuous validation of the Aura ozone products. Both the stratospheric ozone columns derived from the CAFS measurements and the Differential Airborne Lidar (DIAL) ozone profile measurements aboard the NASA DC8 aircraft detected atypical ozone variability in the tropical tropopause layer (TTL). Analysis of the in-situ aircraft data and the data above the aircraft are performed with regards to the TTL properties that are found to be influenced by both slow ascent and by rapid transport in the deep convection conditions. The transport trajectories and correlated measurements of the boundary layer tracers suggest strong connection of the deep convective processes regularly observed near the south boarder of Mexico in July 2007 and the low-ozone episodes observed in the TTL near the coast of Ecuador. |
