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More information on some input arrays can be found when moving the cursor above the corresponding field in the questionnaire. Those fields are also explained in the glossary.

CAMx: Comprehensive Air quality Model with extensions

General information

Model name and version

short nameCAMx
full nameComprehensive Air quality Model with extensions
revision2005
date1997
last change

Responsible for this information

nameAna Isabel Miranda
instituteUniversidade de Aveiro
addressUniversidade de Aveiro, Dept. Ambiente e Ordenamento
zip3810
city193 Aveiro
countryPortugal
phone00351234370200
fax00351234429290
e-mailaicm(belongs-to)dao.ua.pt

Additional information on the model

Contact person for model code

same as person above
name
instituteENVIRON International Corporation
divisions
streetGolden Gate Plaza 101 Rowland Way, Suite 220
zip94945-5010
cityNovato, California,
countryUSA
phone415/899-0700
emailMajordomo@environ.org
fax415/899-0707

Model developer and model user

developer and userENVIRON International Corporation Novato, California, USA

Level of Knowledge needed to operate model

basic
intermediate
advanced
remarksIt is required intermediate knowledge on fortran programming and on meteorology and atmospheric sciences

Model use at your institution

operational
for research
other use

Model code available?

is available?yes
more detailshttp://www.camx.com/

Minimum computer resources required

type
time needed for run
storage

Further information

documentation
model references
webpage
additional information

Model properties

Model type

2D
3D
meteorology
chemistry & transport

Model scale

microscale
mesoscale
macroscale
short term
long term

Meteorological variables

Input data
u
v
w
ζ
pv
T
θ
θl
p
Gph
ρ
qv
qt
qlc
qf
qsc
qlr
qsh
qsg
qss
N
E
ε
K
zi
other variables i
other variables ii
other variables iii

Chemical substances

PrognosticDiagnosticDry depositionWet depositionInput data
SO2
NO
NO2
NOX
NH3
HNO3
O3
CH4
DMS
H2O2
VOC
C6H6
HCHO
CO
CO2
POP
PM 10
PM 2.5
PPM10
PM 0.1
PM 1
NH4
SO4
dust
sea salt
BC
POM
SOA
NO3
Other gases
1st radioactivity
2nd radioactivity
3rd radioactivity
Cd
Pb
other heavymetals
pesticides
1st radioactivity
2nd radioactivity
3rd radioactivity
remarks

Approximations

Boussinesq
anelastic
hydrostatic
flat earth
remarksCAMx can perform simulations on three types of cartesian map projections: Universal Transverse Mercator, Rotated Polar Stereographic, and Lambert Conic Conformal. CAMx also offers the option of operating on a curvi-linear geodetic latitude/longitude grid system as well.

Parametrizations

Chemistry & transport

photolysis rate
dry deposition
wet deposition
remarks

Chemical reactions

Gas & wet phase chemistry

chemical transformations calculated
chemical transformations neglected
other
gas phase chemistry (give details)4 versions of mechanism CB-IV, 1999 VERSION OF saprc MECHANISM
wet phase chemistry (give details)
more information

Aerosol chemistry

passive aerosol
dry aerosol
wet aerosol
sectional approach
modal approach
other
nucleation
coagulation
condensation
aerosol mixing
aerosol ageing
primary aerosol formation
aerosol-gas phase interactions
optical properties
give details

Initialization & boundary treatment

Initialization

chemistry & transport
meteorology

Input data (name sources for data, e.g. website)

orography
land use
obstacles
vegetation
meteorology
concentrations
emissionsnational emissions inventories
remarks

Data assimilation

Chemistry & transport
nudging technique
adjoint model
3D-VAR
4D-VAR
OI
details

Boundary conditions

Chemistry & transport
surfaceGridded Boundary Concentrations
topTime/space Constant Top Concentrations
lateral inflowGridded Boundary Concentrations
lateral outflowGridded Boundary Concentrations

Nesting

Chemistry & transport
one way
two way
other
variables nested
nesting online
nesting offline
data exchange by array
data exchange by file
time step for data exchange
explain method
variables nested
other

Solution technique

Coordinate system and projection

Horizontal

cartesian
Lambert conformal
latitude / longitude
rotated lat. / long.

Vertical

z coordinate
surface fitted grid
pressurecoordinate
sigma coordinate
remarks

Numeric

Chemistry & transport

Grid

Arakawa A
Arakawa B
Arakawa C
Arakawa D
Arakawa E
uniform grid
nonuniform grid
Euler
Lagrange
Gauss

Time integration

explicit
split-explicit
semi-implicit
time step same as meteorology
other

Spatial discretisation

scalar quantities
additional information
other
chemistry solverChemical Kinetics Solver Options: CMC and IEH. CMC - fast and highly efficient, based on n “adaptive-hybrid” approach; relative to the standard chemistry solvers for the CB-IV mechanism, this approach results in about a ten-fold speedup in the chemistry solution and an overall model speedup by a factor of 3 to 4. The IEH solver accuracy is comparable to reference methods such as LSODE. The accuracies of the IEH and CMC solvers are very similar during the day with the IEH solver being more accurate than the CMC solver at night. However, the IEH solver is several times slower than the CMC solver.

Model resolution

Chemistry & transport

HorizontalVertical
max
min

Domain size

Chemistry & transport

HorizontalVertical
max
min

Model Validation and Application

Validation & evaluation

Used validation & evaluation methods

analytic solutions
evaluated reference dataset
model intercomparison
additional validation & evaluation efforts
remarks

Application examples

application examples

Participation in specific model evaluation exercises

AQMEII
List experiments (AQMEII)
Cost728
List experiments (COST728)
HTAP
List experiments (HTAP)
MEGAPOLI
List experiments (MEGAPOLI)