Cirrus in the Tropopause Transition Layer: Association with Planetary-Scale Waves and the Madden-Julian Oscillation

Details Cirrus in the Tropopause Transition Layer: Association with Planetary-Scale Waves and the Madden-Julian Oscillation Cirrus in the Tropopause Transition Layer: Association with Planetary-Scale Waves and the Madden-Julian Oscillation

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.a13g0315v&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #A13G-0315

Physics

[3311] Atmospheric Processes / Clouds And Aerosols

Scientific paper

Cloud boundaries identified during the first three years of data from the CALIPSO satellite-based lidar are used to investigate the relationship between cirrus within the tropopause transition layer (TTL) and both their planetary-scale environment and the Madden-Julian Oscillation (MJO). TTL cirrus are significantly related to the large-scale ascent associated with planetary wave activity within the TTL — specifically, they are well correlated with temperature and wind perturbations within the TTL that resemble convectively-induced, mixed Kelvin-Rossby wave solutions — but are not significantly related to nearby convective activity. During the evolution of the MJO, a TTL cirrus signature which resembles a Kelvin-Rossby wave solution is observed over the western Pacific warm pool region; this signature is centered ~20-30° of longitude to the east of the associated convection. A cirrus maximum is also observed over equatorial South America and Africa during the latter stages of a normal MJO cycle. Tropical mean TTL cirrus fraction is modulated by the MJO, with ~120% more TTL cirrus equatorward of 10° latitude when the convective maximum enters the Pacific than when the MJO is in its beginning stages.

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