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List, classification & detail view

Note:
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.

CAM-CHEM: NCAR Community Atmosphere Model with Chemistry

General information

Model name and version

short nameCAM-CHEM
full nameNCAR Community Atmosphere Model with Chemistry
revisionCAM-CHEM-3_3_11_mz13
date10-11-2006
last change

Responsible for this information

namePeter Hess
instituteNCAR
address1850 Table Mesa Drive
zip80305
cityBoulder
countryUSA
phone303-497-1443
fax303-497-1400
e-mailhess(belongs-to)ucar.edu

Additional information on the model

Contact person for model code

same as person above
namePeter Hess
instituteNCAR
divisions1850 Table Mesa Drive
street
zip80305
cityBoulder
countryUSA
phone303-497-1443
emailhess(belongs-to)ucar.edu
fax303-497-1400

Model developer and model user

developer and user

Level of Knowledge needed to operate model

basic
intermediate
advanced
remarks

Model use at your institution

operational
for research
other use

Model code available?

is available?no
more detailsWill be released in the next year

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 gasesThe model computes distributions of
1st radioactivity
2nd radioactivity
3rd radioactivity
Cd
Pb
other heavymetals
pesticides
1st radioactivity
2nd radioactivity
3rd radioactivity
remarks

Approximations

Boussinesq
anelastic
hydrostatic
flat earth
remarks

Parametrizations

Chemistry & transport

photolysis rateInteractive calculation of photolysis: Fast Troposphere Ultraviolet (FTUV).
dry depositionInteractive dry deposition based on Wesely.
wet depositionGiorgi and Chameides, see MOZART webpage: http://gctm.acd.ucar.edu/mozart/
remarks

Chemical reactions

Gas & wet phase chemistry

chemical transformations calculated
chemical transformations neglected
other
gas phase chemistry (give details)97 species are calculated. For details see the MOZART webpage: http://gctm.acd.ucar.edu/mozart/
wet phase chemistry (give details)Used to calculate oxidation of SO2: see Tie et al., JGR, 2003.
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 detailsSea-salt and Dust have 4 modes each (for more information see Mahowald et al, 2006, JGR). All other aerosols: NH4NO3, SO4, Black Carbon, SOA and Organic Carbon have one mode (see Lamarque et al., GRL, 2005)

Initialization & boundary treatment

Initialization

chemistry & transport
meteorology

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

orographyNCEP reanalysis
land useNCEP reanalysis
obstacles
vegetation
meteorologyNCEP reanalysis
concentrations
emissionsPOET emissions with updates for biomass burning and guenther isoprene emissions.
remarks

Data assimilation

Chemistry & transport
nudging technique
adjoint model
3D-VAR
4D-VAR
OI
detailsWinds are input from analysis and interpolated to the model time. Pressure correction technique used for the surface pressure.

Boundary conditions

Chemistry & transport
surface
topTop boundary condition are set for some species. Synoz parameterization used for ozone.
lateral inflow
lateral outflow

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
remarkshybrid sigma coordinate is used in the vertical

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
otherLin-Rood
chemistry solverDepends on the species: see Horowitz et al., 2003 for more details.

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)