Thursday, November 27, 2014

AC4 funds research that proposes revised mechanism for isoprene chemistry

A recent study by Jingqiu Mao of NOAA's Geophysical Fluid Dynamics Laboratory and his colleagues published in the Journal of Geophysical Research focused on the complex relationships that control chemistry and atmospheric transport of isoprene and related compounds. Isoprene is the most important volatile organic compound (after methane) emitted by vegetation. It affects tropospheric ozone (aka surface ozone pollution), hydroxyl radical (the key pollution "cleaning" agent in the atmosphere) and aerosols in complex ways.

The study, supported by the Climate Program Office's Earth Systems Science/Atmospheric Chemistry, Carbon Cycle, & Climate (AC4) program, used observations from a NASA-NOAA field campaign ICARTT in 2004 and GEOS-Chem global Chemical Transport Model (CTM). Both the field data and GEOS-Chem chemistry has been extensively studied before, yet in this article the authors find contrary results to previously established negative dependence of surface ozone on isoprene emissions. The missing link so far is the importance of organic nitrates which can provide a reservoir for nitrogen oxides (NOx) emissions and can thus export NOx from U.S. boundary layer.

The authors propose a thoroughly revised mechanism for isoprene chemistry, which not only allows for a more accurate model simulation, but fundamentally improves our understanding of atmospheric chemistry. With hundreds of scientists world-wide using GEOS-Chem model alone and tropospheric ozone being central to studies of the atmosphere, this study will have important implications for the field of atmospheric chemistry.

 To download a copy of the full study, visit:

Number of views (2197)/Comments (0)

About the Climate Program Office

The Climate Program Office (CPO) manages competitive research programs in which NOAA funds high-priority climate science, assessments, decision support research, outreach, education, and capacity-building activities designed to advance our understanding of Earth’s climate system, and to foster the application of this knowledge in risk management and adaptation efforts.  CPO-supported research is conducted in regions across the United States, at national and international scales, and globally.  Learn more...

Events Calendar

MAPP Webinar Series: Marine Ecosystems: Forecasting and Projecting Health and Resource Availability

The NOAA CPO Modeling, Analysis, Prediction, and Projections (MAPP) program hosted a webinar on the topic of Marine Ecosystems: Forecasting and Projecting Health and Resource Availability on Tuesday, December 2, 2014. The announcement is provided below; you are invited to remotely join the session.

SARP Webinar Series (December)

Our series on “Climate Information for Managing Risks In Water Resources” is resuming on Tuesday Dec 3rd at 1:30 p.m. ET.  Our first talk will be by Mark Deutschman, Ph.D., PE.  Mark is a civil engineer and Vice President of Houston Engineering.  He will discuss the work he has done with citizen groups in the Klamath Basin in developing a tool to provide climate and water resource data for decision-making.

Click on Article Link For Registration Info