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Gabriele Curci
CETEMPS – Univ. L’Aquila [email protected]
4th GEOS-Chem Users’ Meeting, Harvard University, April 7-10 2009
Gas & Aerosol boundary conditions to Chimere from
GEOS-Chem
With inputs from: Walter Di Nicolantonio and Alessandra Cacciari (CGS/CNR)
Boundary Conditions in regional CTMs
Chimere BCs from GEOS-Chem Harvard University, 4/14/09 Gabriele Curci, CETEMPS - U. L'Aquila 2
Domain of the regional model (e.g. Chimere)
Longitude
Alti
tude
NORTH
EAST WEST
SOUTH
BCs are implemented as concentrations
specified at domain edges and
trasported inside by winds
TOP
Standard BCs to Chimere CTM
Chimere BCs from GEOS-Chem Harvard University, 4/14/09 Gabriele Curci, CETEMPS - U. L'Aquila 3
MONTHLY mean climatologies from global models
Gas LMDz-INCA
Aerosol GOCART
What is the impact of BCs?
Chimere BCs from GEOS-Chem Harvard University, 4/14/09 Gabriele Curci, CETEMPS - U. L'Aquila 4
Test:
CTRL = reference run
NOBC = run w/ BC=0
Results for Ozone:
• Influence of BC expands from boudaries to the center in about 10 days
• BC contribute to a background of 50-60 ppbv
• Importance of BC depends on local photochemistry activity
Using GEOS-Chem hourly output for Chimere Boundary Conditions
• GEOS-Chem v. 8-01-02 • GEOS-4, 4°x5° 30 levs • Dust emissions: scheme implemented
by Duncan et al. [2007], with DEAD emissions
• Saharan emissions reduced by a factor of 3 following Generoso et al. [2008]
Chimere BCs from GEOS-Chem Harvard University, 4/14/09 Gabriele Curci, CETEMPS - U. L'Aquila 5
Effect of hourly BCs on Chimere O3
Chimere BCs from GEOS-Chem Harvard University, 4/14/09 Gabriele Curci, CETEMPS - U. L'Aquila 6
EMEP average
Chimere w/ Monthly BCs
Chimere w/ Hourly BCs
Only marginal improvement:
Bias +0.3 ppb RMS -0.2 ppb
r +0.02
Anthropogenic vs Natural PM10 in Europe (year 2003)
Chimere BCs from GEOS-Chem Harvard University, 4/14/09 Gabriele Curci, CETEMPS - U. L'Aquila 7
Anthropogenic PM10 Natural/Biogenic PM10
µg/m3
Chimere model results [Curci et al., in preparation]
Saharan dust event July 27-29, 2005 MODIS AOT 550 nm
Chimere BCs from GEOS-Chem Harvard University, 4/14/09 Gabriele Curci, CETEMPS - U. L'Aquila 8
24/07 25/07 26/07
27/07 28/07 29/07
Saharan dust event July 27-29, 2005 Images from SEVIRI/MSG
Chimere BCs from GEOS-Chem Harvard University, 4/14/09 Gabriele Curci, CETEMPS - U. L'Aquila 9
Sequence of RGB images composite with Brightness Temperatures Differences using InfraRed SEVIRI channels (IR 8.7, IR10.8, IR 12.0) : DUST appears Magenta
Saharan dust event July 27-29, 2005 GEOS-Chem hourly BCs to CHIMERE
Chimere BCs from GEOS-Chem Harvard University, 4/14/09 Gabriele Curci, CETEMPS - U. L'Aquila 10
Effect of hourly BCs on Chimere PM10 Comparison with EMEP ground obs
Chimere BCs from GEOS-Chem Harvard University, 4/14/09 Gabriele Curci, CETEMPS - U. L'Aquila 11
EMEP average
Chimere w/ std BCs
Chimere w/ Monthly BCs
Chimere w/ Daily BCs
Chimere w/ Hourly BCs
Viznar (ES) 03°W Chaumont (CH) 07°E
Ispra (IT) 09°E Iskrba (SI) 14°E
27/07 28/07
29/07 30/07
THANKS FOR YOUR ATTENTION!
Conclusions on preliminary results: • Regional ozone simulation not really sensitive to BC details • Regional PM simulation very sensitive to Saharan dust events interesting to account for “natural” PM10 excedances
Follow ups of this work: • Comparison with ground data with PM speciation info (e.g. separate contribution from dust) • Comparison with AERONET: AOD at other wavelengths? • Test higher GEOS-Chem resolution (2°x2.5°) • More episodes and statistics on the longer term
Chimere BCs from GEOS-Chem Harvard University, 4/14/09 Gabriele Curci, CETEMPS - U. L'Aquila 12
Implementation of GEOS-Chem BCs to CHIMERE CTM
Chimere BCs from GEOS-Chem Harvard University, 4/14/09 Gabriele Curci, CETEMPS - U. L'Aquila 13
GEOS-Chem global CTM ts_YYYYMMDD.bpch ts_YYYYMMDD.bpch ts_YYYYMMDD.bpch ts_YYYYMMDD.bpch
src/prep/ prep_boun.f90
INI_CONCS.nc BOUN_CONCS.nc
Chimere core (Version 2008b) LE
GE
ND
FILES
Existing CODE
New CODE
Hourly or daily GEO
S-Chem timeseries gas & aerosol (binary format)
Chimere pre-processing
Hourly Chimere
BC at domain edges (netCDF)
If .not. conse-cutive
run
