Gabriele Curci
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A CHEMISTRY-TRANSPORT MODEL POST-PROCESSING TOOL FOR A FLEXIBLE CALCULATION OF AEROSOL OPTICAL PROPERTIES Gabriele Curci CETEMPS Dept. Physical and Chemical Sciences University of L’Aquila [email protected]. it 9 th International Symposium on Tropospheric Profiling, 3-7 September 2012, L’Aquila, Italy τ(λ), ω(λ), g(λ), m(λ), dV/d log(r), …
description
A CHEMISTRY-TRANSPORT MODEL POST-PROCESSING TOOL FOR A FLEXIBLE CALCULATION OF AEROSOL OPTICAL PROPERTIES. τ ( λ ), ω ( λ ), g ( λ ), m ( λ ), dV /d log(r), …. Gabriele Curci. CETEMPS Dept . Physical and Chemical Sciences University of L’Aquila [email protected]. - PowerPoint PPT Presentation
Transcript of Gabriele Curci
A CHEMISTRY-TRANSPORT MODEL POST-PROCESSING TOOL FOR A FLEXIBLE CALCULATION OF AEROSOL
OPTICAL PROPERTIES
Gabriele Curci
CETEMPSDept. Physical and Chemical Sciences
University of L’Aquila
9th International Symposium on Tropospheric Profiling, 3-7 September 2012, L’Aquila, Italy
τ(λ), ω(λ), g(λ), m(λ), dV/d log(r), …
CURRENT VERSION BASED ON GEOS-Chem OUTPUT
Bulk aerosol (mass only) chemistry-transport modelNeed to assign RH-dependent size distributions and species densities
ln r
dN /
d ln
r
rm
σg
Species 1
RH
Species 2
Species N . . .
If external mixing and spherical particles are
assumed:
Mie parameters averaged over size distributions may be pre-tabulated as a function of RH, and then used to calculate e.g. AOD at each time step and grid cell:
N
ii
ieffi
iext MRHr
RHQAOD
1 ,
,
)(
)(
4
3
INTERNAL MIXING OPTIONS
homogeneous mixing core/shell mixing
Species 1
Species 2
Species N . . .
Species combine in a new size distribution at each time step and grid cell
Distribution average Mie parameters are not useful anymore
Radius-by-radius calculations using Mie parameters tabulated as a function of size and refractive index(CPU time x 10 w.r.t. external mixing)
MISR SPECTRAL AODCONSTRAINT ON MASS AND SIZE DISTRIBUTION
443 nm 865 nm
MISR
GEOS-Chem
GC-
MISR
MISR SPECTRAL AODCONSTRAINT ON MASS AND SIZE DISTRIBUTION
443 nm 865 nm
MISR
GEOS-Chem
GC-
MISR
AERONET EFFECTIVE RADIUSCONSTRAINT ON SIZE DISTRIBUTION
AERONET VOLUME CONCENTRATIONCONSTRAINT ON SIZE DISTRIBUTION AND MASS
AERONET REFRACTIVE INDEX (REAL)CONSTRAINT ON COMPOSITION
AERONET REFRACTIVE INDEX (IMAGINARY)CONSTRAINT ON COMPOSITION
10^
AERONET SINGLE SCATTERING ALBEDOCONSTRAINT ON MIXING
EXTERNAL MIXING
CORE/SHELL MIXING
INPUT TO RADIATIVE TRANSFER MODEL (LIBRADTRAN)
FUTURE DEVELOPMENTS
• Complete debugging and release version with internal mixing option and AERONET-like output
• Extension to sectional and modal aerosol models
• Definition of a general input format. Also useful to input idealized profiles
• Continued implementation of more flexible input/output options
