4:00 PM - 4:15 PM
[AAS09-21] Is convection important for controlling stratospheric humidity?
Keywords:tropical tropopause layer, water vapor, cirrus clouds, stratosphere, convection, climate
Convection moistens the lower stratosphere by approximately 0.6 ppmv (about 15% increase) and increases the cloud fraction in the upper troposphere by roughly 15%. Convection moistens the upper troposphere and lower stratospheric region mostly by saturating the convectively-influenced parcels. Including lofted ice in the microphysics has a negligible impact on lower stratospheric humidity. The highest convection has a disproportionately large impact on stratospheric water vapor enhancement. Implications of these model results on the role of convection on present and future climate will be discussed.