1. Airborne Tropical TRopopause Experiment (ATTREX): Eric Jensen (PI), Leonhard Pfister (Co-PI)

2. ATTREX Science Overarching science Goals: 1.To imporve our understanding of how deep convection, slow large-scale ascent, waves, and cloud microphysics control the humidity and chemical composition of air entering the stratosphere. 1.To improve global-model predictions of feedbacks associated with future changes in TTL cirrus, stratospheric humidity, and stratospheric ozone in a changing climate.

3. NASA Global Hawk Unmanned Air System

4. NOAA H 2 O ATTREX Payload

5. ATTREX Schedule Fall 2011: Dryden Flight Research Center (southern CA) Jan-Feb 2013: DFRC Jan-Feb 2014: Guam (with CONTRAST and CAST) Jun-Jul 2014: Townsville, Australia(?)

6. ATTREX fall 2011Tropical Flights

7. Global Hawk Operations Center

9. Cloud Physics Lidar In situ cirrus layer

12. ~4 m ~2 m

13. ATTREX data availability NASA policy: final data is publicly available http://espo.nasa.gov/missions/attrex/ (ATTREX mission web site) http://espo.nasa.gov/missions/attrex/ http://espoarchive.nasa.gov/ (NASA Earth Science Project Office) http://espoarchive.nasa.gov/ Use of the ATTREX data is strongly encouraged! Suggested sampling strategies for future deployments would be greatly appreciated!