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Research Highlights

Satellite observations have revealed that cirrus is very prevalent near the tropopause throughout most of the tropics. The cirrus is of interest since it restricts the amount of water vapor that is transported from the upper troposphere into the lower stratosphere. More...

Increasing anthropogenic pollution and wildfires are the main producers of CO (carbon monoxide) pollution in the Northern Hemisphere. More...

The global chemical transport model MOZART-4 has been recently released to the scientific community through the ACD MOZART-4 homepage and the NCAR Community Data Portal. More...

NASA’s SABER instrument on the TIMED satellite measures temperature and ozone through the middle atmosphere from 20 to above 100 km. More...

The HIRDLS satellite reveals the structure of the Upper Troposphere / Lower Stratosphere (UTLS) region by measuring ozone. More...

Over the past 4 years, the POP group has made observations of OH, H₂SO₄, HO₂, HO₂+RO₂ and OH reactivity at a number of sites around the globe. More...

ACD in the News

Ozone past and future. In the hubbub of the Copenhagen climate summit and its aftermath, a global agreement forged almost a quarter century ago stood quietly in the background. All of the world's nations have now ratified the Montreal Protocol, More...

ACD's Jim Smith has won the 2009 Kenneth T. Whitby Award, given annually by the American Association for Aerosol Research. This award recognizes outstanding technical contributions to aerosol science and technology by a young scientist. Congratulations, Jim!

A report by the National Research Council of the National Academies released on September 29 takes a close look at how air pollution is transported to and from the United States. "Pollution contributions from other continents affecting air quality in the United States are small but significant," says NESL/ACD's David Edwards. More...

David Edwards, Ave Arellano, and Merritt Deeter published a study describing ACD's use of observing system simulation experiments (OSSEs) to simulate exactly how NASA's new GEO-CAPE satellite would improve forecasts of carbon monoxide concentrations. The article was highlighted in the Journal of Geophysical Research - Atmospheres.

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Recent Publications:

Massie, Steven, John Gille, Cheryl Craig, Rashid Khosravi, J Barnett, W Read, D Winker, 2010: HIRDLS and CALIPSO observations of tropical cirrus. J. Geophys. Res., 10.1029/2009JD012100 .

Emmons, Louisa, Stacy Walters, P Hess, Jean-Francois Lamarque, Gabriele Pfister, D Fillmore, C Granier, Alex Guenther, Douglas Kinnison, T Laepple, John Orlando, Xue Tie, Geoffrey Tyndall, Christine Wiedinmyer, S Baughcum, S Kloster, 2010: Description and evaluation of the Model for Ozone and Related chemical Tracers, version 4 (MOZART-4). Geosci. Model Devel., link .

Tang, Yongxin, Geoffrey Tyndall, John Orlando, 2009: Spectroscopic and Kinetic Properties of HO2 Radicals and the Enhancement of the HO2 Self Reaction by CH3OH and H2O. J. Phys. Chem. A, 10.1021/jp905279b .