1. Model Future: Nesting with Regional Models
Second GEOS-CHEM User’s Meeting, April 4-6, 2005
Harvard University

2. Relevant Presentations
Linking GEOS-CHEM with CMAQ: consistency in meteorology and chemistry (Byun, U. Houston)
Evaluation of the GEOS-CHEM/CMAQ inteface over China and US (Li , U. Tennessee)
Sensitivity of surface ozone in the U.S. to isoprne emissions and chemistry (Fiore, GFDL)
Aerosol simulations over North America (Donkelaar, Dalhousie)
Impact of trans-boundary transport of aerosols on regional air quality (In, U. Houston)
Origin and distribution of ozone for the Eastern Mediterranean region (Giannakopoulos, Athens)
Nesting GEOS-CHEM with a regional model for Greece (Tombrou-Tzella, Athens)
Effects of climate change on air quality (Wu, Harvard)

3. Overview Regional models used Air pollution problems
Nested GEOS-CHEM (1deg x 1deg)
US urban//regional models (CMAQ, CAMx, UAM)
European urban/regional model (Chimere, EURAD?)
Use of other Global models (RAQMS, Mozart, etc…)
Air pollution problems
Long-rang transport of ozone & PM regional & urban scale
Isoprene emissions and chemistry
Global climate change and air quality
Nest modeling of Hg, POPS, etc

4. Research Issues for Global-Regional Linkage
Harmonization of gas-phase chemistry
O3-NOx-HC chemistry of GEOS-CHEM
CB-4, SAPRC in urban/regional models
Isoprene chemistry
Harmonization of aerosol modules
Linking of consistent mass and number concentrations
Different modeling method: sectional vs. modal
Aerosol species represented (inorganic, EC, OC, PM ultra fine, fine, coarse)
Consistency in dynamics
GMAO and GISS global dynamics model and MM5, WRF, RAMS, …
Transport schemes (boundary fluxes)
State variables (p,T, u, v, q, other hydrometeors,)..
Topography, LULC, PBL heights, tropopause heights, et
Cloud mixing
Removal processes

5. Research Issues for Global-Regional Linkage
Consistency in emissions inventories
GEIA vs. NEI99 and future year inventories
Regional emissions inventory issues – Canada, Mexico, Asia,…)
Dust mobilization parameterization
Biogenic emissions consistency (BEIS-3 vs. Megan Inventory)
Lightning NOx
Modeling/Numerics
On-line/off-line, frequency of data transfer, interface processor
Grid and coordinate representations, interpolation issues
Inverse modeling (Bayesian, Kalman filter, Adjoint methods)
Data assimilation (surface measurement, satellite data, special aircraft data)