HR: 0800h
AN: A21D-0737    [Abstracts]
TI: An Evaluation of the Impact of Lightning NO Emissions in the GMI Model on Upper Tropospheric Chemistry in the Tropics using SHADOZ data
AU: * Allen, D J
EM: allen@atmos.umd.edu
AF: Dept. of Atmospheric and Oceanic Science, University of Maryland, College Park, MD 20742,
AU: Pickering, K E
EM: pickerin@atmos.umd.edu
AF: Atmospheric Chemistry and Dynamics Branch, NASA-GSFC, Greenbelt, MD 20705,
AU: Duncan, B N
EM: duncan@hyperion.gsfc.nasa.gov
AF: UMBC-Goddard Earth Science and Technology Center, NASA-GSFC, Greenbelt, MD 20705,
AU: Strahan, S E
EM: strahan@prometheus.gsfc.nasa.gov
AF: UMBC-Goddard Earth Science and Technology Center, NASA-GSFC, Greenbelt, MD 20705,
AU: Rodriguez, J M
EM: jrodriguez@hyperion.gsfc.nasa.gov
AF: Atmospheric Chemistry and Dynamics Branch, NASA-GSFC, Greenbelt, MD 20705,
AU: Damon, M
EM: Megan.R.Damon@nasa.gov
AF: Northrop Grumman Corporation, Code 610.3; NASA-GSFC, Greenbelt, MD 20705,
AB: NASA's Global Modeling Initiative off-line tropospheric chemistry model (GMI-CTM) is used to study the role lightning NO emissions play in determining upper tropospheric ozone distributions in the tropics and especially at SHADOZ sites. Simulations of 2004 and 2005 were performed driven by meteorological fields from version 4 of the Goddard Earth Observing System (GEOS-4) reanalysis. The GMI-CTM was run with no lightning NO emissions, with lightning NO emissions based on climatological cloud top heights, and with lightning NO emissions based on GEOS-4 convective mass fluxes. We will first examine the output for middle and upper tropospheric reactive odd nitrogen and ozone with respect to the spatial and temporal distributions of the model flash rates. Comparisons will be made between the model output for these species and observations. Ozone mixing ratios from the model will be compared with the SHADOZ climatology and with soundings during the time period of the assimilation. The contribution of lightning NO to the upper tropospheric NO and ozone budget will be assessed for selected time periods. The impact of the convective-based lightning algorithm on the agreement between SHADOZ- and model-calculated profiles will be discussed.
DE: 0365 Troposphere: composition and chemistry
DE: 0368 Troposphere: constituent transport and chemistry
DE: 3324 Lightning
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting