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![Page 1: Gas & Aerosol boundary conditions to Chimere from …acmg.seas.harvard.edu/.../ppt/Wednesday/WedC_AirQuality1_curci_1… · Standard BCs to Chimere CTM Chimere BCs from GEOS-Chem](https://reader036.fdocuments.in/reader036/viewer/2022062907/5a9d74e07f8b9abd058d5fe5/html5/thumbnails/1.jpg)
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)
![Page 2: Gas & Aerosol boundary conditions to Chimere from …acmg.seas.harvard.edu/.../ppt/Wednesday/WedC_AirQuality1_curci_1… · Standard BCs to Chimere CTM Chimere BCs from GEOS-Chem](https://reader036.fdocuments.in/reader036/viewer/2022062907/5a9d74e07f8b9abd058d5fe5/html5/thumbnails/2.jpg)
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
![Page 3: Gas & Aerosol boundary conditions to Chimere from …acmg.seas.harvard.edu/.../ppt/Wednesday/WedC_AirQuality1_curci_1… · Standard BCs to Chimere CTM Chimere BCs from GEOS-Chem](https://reader036.fdocuments.in/reader036/viewer/2022062907/5a9d74e07f8b9abd058d5fe5/html5/thumbnails/3.jpg)
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
![Page 4: Gas & Aerosol boundary conditions to Chimere from …acmg.seas.harvard.edu/.../ppt/Wednesday/WedC_AirQuality1_curci_1… · Standard BCs to Chimere CTM Chimere BCs from GEOS-Chem](https://reader036.fdocuments.in/reader036/viewer/2022062907/5a9d74e07f8b9abd058d5fe5/html5/thumbnails/4.jpg)
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
![Page 5: Gas & Aerosol boundary conditions to Chimere from …acmg.seas.harvard.edu/.../ppt/Wednesday/WedC_AirQuality1_curci_1… · Standard BCs to Chimere CTM Chimere BCs from GEOS-Chem](https://reader036.fdocuments.in/reader036/viewer/2022062907/5a9d74e07f8b9abd058d5fe5/html5/thumbnails/5.jpg)
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
![Page 6: Gas & Aerosol boundary conditions to Chimere from …acmg.seas.harvard.edu/.../ppt/Wednesday/WedC_AirQuality1_curci_1… · Standard BCs to Chimere CTM Chimere BCs from GEOS-Chem](https://reader036.fdocuments.in/reader036/viewer/2022062907/5a9d74e07f8b9abd058d5fe5/html5/thumbnails/6.jpg)
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
![Page 7: Gas & Aerosol boundary conditions to Chimere from …acmg.seas.harvard.edu/.../ppt/Wednesday/WedC_AirQuality1_curci_1… · Standard BCs to Chimere CTM Chimere BCs from GEOS-Chem](https://reader036.fdocuments.in/reader036/viewer/2022062907/5a9d74e07f8b9abd058d5fe5/html5/thumbnails/7.jpg)
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]
![Page 8: Gas & Aerosol boundary conditions to Chimere from …acmg.seas.harvard.edu/.../ppt/Wednesday/WedC_AirQuality1_curci_1… · Standard BCs to Chimere CTM Chimere BCs from GEOS-Chem](https://reader036.fdocuments.in/reader036/viewer/2022062907/5a9d74e07f8b9abd058d5fe5/html5/thumbnails/8.jpg)
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
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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
![Page 10: Gas & Aerosol boundary conditions to Chimere from …acmg.seas.harvard.edu/.../ppt/Wednesday/WedC_AirQuality1_curci_1… · Standard BCs to Chimere CTM Chimere BCs from GEOS-Chem](https://reader036.fdocuments.in/reader036/viewer/2022062907/5a9d74e07f8b9abd058d5fe5/html5/thumbnails/10.jpg)
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
![Page 11: Gas & Aerosol boundary conditions to Chimere from …acmg.seas.harvard.edu/.../ppt/Wednesday/WedC_AirQuality1_curci_1… · Standard BCs to Chimere CTM Chimere BCs from GEOS-Chem](https://reader036.fdocuments.in/reader036/viewer/2022062907/5a9d74e07f8b9abd058d5fe5/html5/thumbnails/11.jpg)
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
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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
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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