NAM_CH_ORILAM

This namelist is used to activate ORILAM chemical aerosols (lognormal distribution for Aitken and accumulation mode). This parameterization include coagulation (intra and inter modal), nucleation, sedimentation, condensation/adsorption of gas phase. This parameterization need to be run together with gas chemical phase (namelist NAM_CH_MNHCn). For correct representation, it is recommended to have severals compounds as HNO3 (nitric acid), H2SO4 (or SULF; sulphates), NH3 (ammonium) and CO (carbon monoxyde) in the chemical scheme.

NAM_CH_ORILAM content

Fortran name	Fortran type	Default value
LORILAM	LOGICAL	.FALSE.
LVARSIGI	LOGICAL	.FALSE.
LVARSIGJ	LOGICAL	.FALSE.
LSEDIMAERO	LOGICAL	.FALSE.
XINIRADIUSI	REAL	0.01
XINIRADIUSJ	REAL	0.5
CRGUNIT	CHARACTER(LEN=4)	‘MASS’
XINISIGI	REAL	1.60
XINISIGJ	REAL	1.60
XN0IMIN	REAL	10.0
XN0JMIN	REAL	1.0
XCOEFRADIMAX	REAL	10.0
XCOEFRADJMAX	REAL	10.0
XCOEFRADIMIN	REAL	0.1
XCOEFRADJMIN	REAL	0.1
CMINERAL	CHARACTER(LEN=5)	‘NONE’
CORGANIC	CHARACTER(LEN=5)	‘NONE’
CNUCLEATION	CHARACTER(LEN=80)	‘MAATTANEN’
LCONDENSATION	LOGICAL	.TRUE.
LCOAGULATION	LOGICAL	.TRUE.
LMODE_MERGING	LOGICAL	.FALSE.

• LORILAM : flag to activate chemical aerosol (only if LUSECHEM = .TRUE.).

• LVARSIGI : flag to activate variable standard deviation for mode I (Aitken).

• LVARSIGJ : flag to activate variable standard deviation for mode J (accumulation).

• LSEDIMAERO : flag to activate aerosol sedimentation.

• XINIRADIUSI : flag for the initialization of mean radius mode I (Aitken mode) of the distribution (in micrometers).

• XINIRADIUSJ : flag for the initialization of mean radius mode J (accumulation mode) of the distribution (in micrometers).

• CRGUNIT : type of mean radius given in namelist. Default is for a mass spectral distribution; XINIRADIUSI and XINIRADIUSJ have been converted into a mean radius in number. IF CRGUNIT \(\neq\) ‘MASS’ then the mean radius need to be given for a number spectral distribution (no conversion).

• XINISIGI : value of standard deviation for mode I (Aitken mode).

• XINISIGJ : value of standard deviation for mode J (accumulation mode).

• XCOEFRADIMAX : factor to compute maximum value of mean radius mode I (Aitken mode). \(R_i^{max} = XCOEFRADIMAX . XINIRADIUSI\)

• XCOEFRADJMAX : factor to compute maximum value of mean radius mode J (accumulation mode). \(R_j^{max} = XCOEFRADJMAX . XINIRADIUSJ\)

• XCOEFRADIMIN : same as XCOEFRADIMAX but for the minimum value.

• XCOEFRADJMIN : same as XCOEFRADIMAX but for the minimum value.

• CMINERAL : type of parameterization for mineral gas/particle balance. Possible values are:

  • ‘ARES’ : ARES parameterization (non vectorized)

  • ‘NARES’: neuronal network of ARES (vectorized)

  • ‘ISPIA’: ISORROPIA parameterization (non vectorized)

  • ‘TABUL’: tabulation of ISORROPIA (vectorized)

  • ‘EQSAM’: EQSAM parameterization (vectorized)

• CORGANIC : type of parameterization for organic gas/particle balance. To activate organic parameterization it is necessary to use a chemical scheme capable forming secondary organic aerosol (i.e. RELACS2 or CACM). Possible values are:

  • ‘PUN’ : PUN parameterization

  • ‘MPMPO’: MPMPO (non vectorized)

• CNUCLEATION : type of parameterization for nucleation’s parametrization. Four options are available:

  • ‘NONE’ : no nucleation

  • ‘KULMALA’ : based on Kulmala et al. [1998]

  • ‘VEHKAMAKI’ : based on Vehkamäki [2002]

  • ‘MAATTANEN’ : based on Maattanen et al. [2018]

• LCONDENSATION : flag to activate the condensation processes.

• LCOAGULATION : flag to activate the intra and inter coagulation processes.

• LMODE_MERGING : flag to activate the mode merging.

• Convective scavenging is activated with LCH_CONV_SCAV in NAM_CH_MNHCn.