Research

    Figure 1 highlights the various mechanisms for stratosphere-troposphere exchange: ascending air in the tropics, descending air in polar regions, and a double tropopause at mid-latitudes.  My research focuses on the mid-latitude UTLS, where lower stratospheric air can descend into the troposphere.  At the same time, upper tropospheric air ascends into the lower stratosphere.

Figure 1: Cross Section of UTLS region, retrieved from http://www.atmosp.physics.utoronto.ca/SPARC/News22/22_Randel_Hiaper.html