Gabriele Curci CETEMPS – Univ. L’Aquila [email protected]4 th 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)
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Gas & Aerosol boundary conditions to Chimere from GEOS-Chem
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. TOP. BCs are implemented as concentrations specified at domain edges and trasported inside by winds. - PowerPoint PPT Presentation
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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-ChemHarvard University, 21/04/23 Gabriele Curci, CETEMPS - U.
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Effect of hourly BCs on Chimere O3
Chimere BCs from GEOS-ChemHarvard University, 21/04/23 Gabriele Curci, CETEMPS - U.
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EMEP average
Chimere w/ Monthly BCs
Chimere w/ Hourly BCs
Only marginal improvement:
Bias +0.3 ppbRMS -0.2 ppb
r +0.02
Anthropogenic vs Natural PM10 in Europe (year 2003)
Chimere BCs from GEOS-ChemHarvard University, 21/04/23 Gabriele Curci, CETEMPS - U.
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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-ChemHarvard University, 21/04/23 Gabriele Curci, CETEMPS - U.
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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-ChemHarvard University, 21/04/23 Gabriele Curci, CETEMPS - U.
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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-ChemHarvard University, 21/04/23 Gabriele Curci, CETEMPS - U.
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Effect of hourly BCs on Chimere PM10 Comparison with EMEP
ground obs
Chimere BCs from GEOS-ChemHarvard University, 21/04/23 Gabriele Curci, CETEMPS - U.
L'Aquila
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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
29/0730/07
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-ChemHarvard University, 21/04/23 Gabriele Curci, CETEMPS - U.
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Implementation of GEOS-Chem BCs to CHIMERE CTM
Chimere BCs from GEOS-ChemHarvard University, 21/04/23 Gabriele Curci, CETEMPS - U.