During the AGU Fall Meeting in San Francisco, Director Liou presented a paper entitled "Climatic Effects of Contrail Cirrus over the Western United States: A Regional Climate Model Investigation," in the Aviation and Climate Session on Thursday, December 17, 2009. Graduate Student Calvin Liang presented a paper entitled, "A Combined A-Train Perspective on Upper Tropospheric Humidity and Radiative Heating." A number of JIFRESSE scientists also presented posters and papers at the meeting.