Penn State News - Andrew Carleton en-us Penn State University Relations (Penn State News) Jets’ contrails contribute to heat-trapping high-level clouds Condensation trails that airplanes produce mean not only a white-streaked sky on some days, but an increase in the amount of high-level clouds and, by extension, warming temperatures, according to a Penn State researcher. Thu, 21 Feb 2013 15:03 -0500 Penn State News - Andrew Carleton Probing Question: How does melting Arctic ice affect weather and climate? By June 2012, Arctic sea ice had already melted to its lowest extent for the month since satellite record keeping began in 1979, according to the National Snow and Ice Data Center. How does this affect our weather in the short term and climate in the long term? In several ways, says Andrew Carleton, a Penn State professor of physical geography who specializes in studying sea ice and climate change. Thu, 01 Nov 2012 (All day) -0400 Penn State News - Andrew Carleton Probing Question: Does commercial jet traffic affect climate? It's hard to dispute that car and truck emissions affect our environment. Tail pipes cough out a brew of gases that contribute to smog, ground-level ozone and global warming. But what about jet pollution? Mon, 05 Dec 2005 (All day) -0500 Penn State News - Andrew Carleton Jet contrails alter average daily temperature range For three days after September 11, the Federal Aviation Administration grounded commercial aircraft in the U.S., stranding travelers, hindering mail delivery and interrupting courier service, but for scientists at Penn State and the University of Wisconsin-Whitewater, the three-day shutdown provided a rare glimpse of the climate effects of jet contrails. Thu, 15 Aug 2002 14:42 -0400 Penn State News - Andrew Carleton