Impact of Mexico City on Regional Air Quality. Louisa Emmons Jean-François Lamarque NCAR/ACD. Chem-Climate WG White Paper. Hemispheric pollution to regional air quality: An issue of resolution Louisa Emmons, Lyatt Jaegle, Loretta Mickley
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Hemispheric pollution to regional air quality: An issue of resolution
Louisa Emmons, Lyatt Jaegle, Loretta Mickley
Scientific advances to be accomplished within this project
1) Improved understanding of feedbacks between climate change and air pollution: effects of changing temperatures/precipitation/water vapor on chemistry, effects of changing emissions (biogenic NOx and VOC, lightning NOx, biomass burning, anthropogenic emissions), effects of changing meteorology (synoptic and hemispheric scales, stratosphere-troposphere exchange).
2) Improved understanding of feedbacks between climate change and export of pollution to the global atmosphere: will a warmer climate lead to more efficient export of pollution? How will it affect the long-range transport of pollution?
3) Improved understanding of the horizontal resolution needed to accurately predict the influences of future climate change on regional air quality and vice versa, through the use of the Weather Research and Forecasting (WRF) model in conjunction with CAM.
4) Exploration of the possibility of downscaling global simulations for analysis of regional air quality.
Comprehensive set of measurements from city to regional scales
INTEX-B - NASA - DC-8 based in Houston
MIRAGE-Mex - NSF - C-130 based in Veracruz; ground measurements
MAX-Mex - DOE - G1
MCMA - Molina Center - surface and mobile lab
Meteorology: NCEP/GFS analyses (42 levels)
anthropogenic: POET-2000 and Mexico NEI (1999)
biomass burning: GFED-2 and C. Wiedinmyer’s N.America calculations (MODIS daily fire counts)
Finer resolution generally matches observations better
Mexico City points
NO emissions from Mexico City are “tagged” to quantify O3 production
Average over March 2006, surface to 400 hPa
T85 has higher concentrations over Mexico City, but not larger regional impact
POET emissions inventory
T85 - higher O3 throughout plume than T42
CAM-Chem - higher O3 over city but weaker plume
C-130 data will be used to evaluate
W/m2Radiative forcing of Mexico City emissions
CAM-Chem, 0.47x0.63 resolution, driven by NCEP-GFS winds
Arctic Research of the Composition of the Troposphere from Aircraft and Satellites (ARCTAS)
NASA aircraft campaign coincident with NOAA and DOE experiments
Part of POLARCAT/IPY
April - Fairbanks - Arctic haze, surface halogen chemistry
July - near Edmonton - Boreal wildfires