When it comes to global air pollution, what goes around comes around. Because prevailing winds blow from west to east around Earth’s midlatitudes, air pollution originating in North America drifts across the Atlantic Ocean to Europe, while Asia’s emissions wind up in North America.   More >

EOL researchers design new instrument for detecting trace gases
A team of researchers in EOL has created a new instrument by applying an innovative technique for mixing different laser beams. More >

Friends of UCAR enhances science education, outreach
If you’ve ever strolled down the Walter Orr Roberts Weather Trail behind the Mesa Lab, you’ve probably learned a few things about the climate, weather, geology, and ecology of the mesa. What you may not have realized, however, is that donations to Friends of UCAR made this trail possible.  More >

Remembering Barry White and Mark Uris
NCAR retiree Barry White passed away on March 4 following a long illness. Mark Uris (CISL) passed away on March 29 due to complications resulting from surgery for the treatment of cancer.  More >

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The second weekend in April produced a wintry potpourri of weather across the Front Range, including an eye-catching array of ice crystals on trees around the Mesa Lab. Tom Wigley (ESSL/CGD) photographed these spiky clusters of crystals attached to pine trees on April 8. Each of the crystals was about 2 inches long, Tom reports, and they grew without congealing around individual pine needles. The rimed crystals likely developed in a moist, supercooled fog (fog containing water droplets in liquid form that exist at temperatures colder than 32 degrees Fahrenheit) with very calm conditions.