UMBC logo
UMBC Department of Physics
News & Events

About

This page contains a single entry from the blog posted on February 12, 2014 3:28 PM.

The previous post in this blog was Seminar: Wednesday Feb 3 at 3:30 pm.

The next post in this blog is Seminar: Wednesday, Feb. 19 at 3:30 pm.

Many more can be found on the main index page or by looking through the archives.

Powered by
Movable Type 3.34

« Seminar: Wednesday Feb 3 at 3:30 pm | Main | Seminar: Wednesday, Feb. 19 at 3:30 pm »

Seminar: Wednesday, Feb 12 at 3:30 pm

Climate and clean air in the 21st century:
Understanding and reducing uncertainties
in atmospheric change
Christopher D. Homes
Department of Earth System Science
University of California, Irvine

Rising concentrations of greenhouse gases are the main drivers of current and projected future climate change. Reactive gases, including methane (CH4) and ozone (O3), contribute substantially to climate forcing and the chemistry controlling their abundances also responds to climate change. Using multiple global chemical transport models we diagnose factors controlling the year-to-year variations in tropospheric hydroxyl (OH), the main sink for atmospheric CH4. The modeled variations over the last decade are then evaluated against our best observational constraints. Using factors that control OH in the recent past, we project CH4 lifetime and abundance forward in time for a range of future climate scenarios. This simple approach agrees with projections from fully coupled Earth System Models. All this information is combined into an uncertainty analysis of the future CH4 abundance and global warming potential. Key process uncertainties are identified and can guide future research priorities.

Location: Physics Bldg., Room 401

UMBC's Department of Physics   |   410-455-2513 or 1-877-707-1969 (toll free)   |   physics@umbc.edu  |  Site Info