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Near Real Time Aerosols

The model can be configured to use near-real-time aerosols from CAMS. This is done by setting USEAERO=camsnrt in ecf/config_exp.h, which leads to retrieval of boundary files containing aerosol mass mixing ratio fields from CAMS. Other values of USEAERO are related to use and generation of climatological (2D) aerosol. Please see scr/forecastmodelsettings.sh for some further details.

  • Namelist NAMNRTAER contains switches related to n.r.t. aerosols in cloud microphysics under src/mpa.
  • Namelist NAMPHY contains definitions for src/arpifs LAEROSEA,LAEROLAN,LAEROSOO,LAERODES,LAEROVOL,LAEROSUL,LAEROMMR,LAERONRT . LAERONRT is set true when n.r.t. aerosols are used. The others are related to climatological aerosol and are set false when n.r.t. aerosols are used.
  • Aerosol fields in YAERO_NL are defined in namelist NAMGFL. Variable NAERO defines the number of available n.r.t. aerosol species (14).
  • Namelist NAERAD contains definition of NAER=1/0 to use or not to use climatological aerosol for radiation. When LAERONRT is set true, NAER is set to 0.

NAMNRTAER namelist

The switches and some parameters can be set in NAMNRTAER (in nam/harmonie_namelists.pm)

  • LCAMS_NRT: switch on the use of CAMS aerosols in HARMONIE-AROME, the Mass mixing ratio fields must be present in the first guess and the boundary conditions. The number and name of those fields are specified in the namelist NAMGFL.
  • SSMINLO: Supersaturation at sfc level. (default 0.05%). The supersaturation activates the condensation nuclei (CN) to obtain CCN.
  • SSMINUP: Supersaturation over SSHEIGHT height (default 0.08%).
  • SSHEIGHT: Height over wich minimum SS is SSMINUP (default 100 m).
  • SSMAX: Maximum supersaturation (default 1.0%).
  • SSFACVV: Factor for dependence of SS with vertical velocity (0.0-1.0).
  • SSFACSS: Factor for dependence of SS with coarse sea salt (0.0-1.0).
  • CCNMIN: Minimum number concentration of Cloud Condensation Nuclei (CCN) inside the cloud: It is considered 10E6 (10 cm-3). Other values can be considered, but probably not over 50cm-3.
  • CLDROPMIN: Minimum CDNC inside the cloud. It is practically the same as CCNMIN. Other values can be considered, but probably not over 50cm-3.
  • IFNMINSIZE: Minimum radius of aerosol ice nucleating particles (default 0.01 micrometer).
  • LMOCA_NRT: In case of getting the aerosol fields from MOCAGE (still not in use).
  • LAEIFN: To activate Ice nuclei (mainly dust and hydrophobic organic matter and Black carbon).
  • LAERDRDEP: Activates the aerosol dry deposition. (FALSE by default).
  • LAECCN2CLDR: By default LAECCN2CLDR=FALSE, that is CDNC=CCN.
  • LAERSSEM: switch for sea salt emission (FALSE by default).