A GEOS-Chem post-processing tool for Aerosol Optical Properties calculations
Lefevre, J., Menkes, C., Bani, P., Marchesiello, P., Curci, G., Grell, G. A., Frouin, R. (2015),
Distribution of sulfur aerosol precursors in the SPCZ released by continuous volcanic degassing at Ambrym, Vanuatu,
Journal of Volcanology and Geothermal Research, doi: 10.1016/j.jvolgeores.2015.07.018
[full-text (pdf, 3.0 Mb)]
Curci, G., Hogrefe, C., Bianconi, R., Im, U., Balzarini, A., Baro, R., Brunner, D., Forkel, R., Giordano, L., Hirtl, M., Honzak, L., Jimenez-Guerrero, P., Knote, C., Langer, M., Makar, P.A., Pirovano, G., Perez, J.L., San Jose, R., Syrakov, D., Tuccella, P., Werhahn, J., Wolke, R., Zabkar, R., Zhang, J., Galmarini, S. (2015),
Uncertainties of simulated aerosol optical properties induced by assumptions on aerosol physical and chemical properties: an AQMEII-2 perspective,
Atmos. Environ., 115, 541-552, doi: 10.1016/j.atmosenv.2014.09.009
[Open Access full-text]
Curci, G. (2013),
Sensitivity tests with GEOS-Chem aerosol optical properties in comparison with satellite and sunphotometer,
6th International GEOS-Chem Meeting,
Harvard University, Cambridge, MA, USA, 6-9 May 2011.
[Presentation (pdf, 4.2 Mb)]
Curci, G., (2012),
FlexAOD: A Chemistry-transport Model Post-processing Tool for A Flexible Calculation of Aerosol Optical Properties,
Proceedings of the 9th International Symposium on Tropospheric Profiling,
L'Aquila, Italy, September 2012,
[full-text (pdf, 370 kb)]
[PowerPoint Presentation (pptx, 3.2 Mb)]
Curci, G. (2011),
A new GEOS-Chem post-processing tool for aerosol optical properties calculations,
5th International GEOS-Chem Meeting,
Harvard University, Cambridge, MA, USA, 2-5 May 2011.
[Presentation (pdf, 1.9 Mb)]
Primary motivation for development of FlexAOD (Flexible Aerosol Optical Depth)
is the increasing availability of ground-based (e.g.
and satellite-based (e.g. MISR and CALIPSO) measurements of atmospheric aerosol optical
In addition to Aerosol Optical Depth (AOD) at several wavelengths, also other
properties such as the Single Scattering Albedo or the Size Distribution are
becoming more common products.
The standard on-line AOD diagnostic of GEOS-Chem chemistry-transport model (see GEOS-Chem wiki for details) may pose limits to full
exploitation of the information content of aerosol observations in combination
with model simulations.
FlexAOD is aimed at filling this gap. The development of the code stems from
the on-line AOD diagnostic of GEOS-Chem: aerosol optical properties are
calculated for 6 «optical» aerosol species (inorganic ions (sulfate
+ nitrate + ammonium), organic carbon, blank carbon, sea salts, and soil dust)
assumed as externally mixed. In its present version, FlexAOD allows the user to:
- calculate AOD at several wavelngths without repeating the
- calculate additional aerosol optical properties (e.g. single scattering
albedo, backscattering coefficient, asymmetry factor, etc.)
- extract aerosol concentrations and optical profiles at selected
locations and times
- prepare aerosol input to Radiative Transfer Model (e.g.
The capabilities of FlexAOD will be gradually expanded. A few developments
are on the pipeline (e.g. options for aerosol internal mixing assumptions,
AERONET-like output variables, size-limited calculations (e.g. AOD due to
particles less than 1 µm), more flexible treatment of GEOS-Chem species),
and others might be coming out from the user community.
Please address any comment/suggestion to the author!
This activity is supported by the
Italian Space Agency (ASI)
in the frame of