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Overview of the tracer code in RegCM

Overview of the tracer code in RegCM. Aerosols ( droplets, smoke particles, dust, pollens, flying cats …) Gazeous phase, chemical species. Tracers. Evolution of concentration (mixing ratio). Qian and Giorgi, 1999. Transport. Primary Emissions. Removal terms.

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Overview of the tracer code in RegCM

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  1. Overview of the tracer code in RegCM Aerosols ( droplets, smoke particles, dust, pollens, flying cats …) Gazeous phase, chemical species Tracers Evolution of concentration (mixing ratio) Qian and Giorgi, 1999 Transport Primary Emissions Removal terms Physico – chemical transformations Strongly dependant on the nature of the tracer

  2. Horizontal and vertical advection Horizontal and vertical diffusion derived from water vapor and cloud water (mm4 Anthes et al., 1987) « Well-mixing approximation » TCUM Rq : Tan et al., 2002 scheme ( work with Kuo-scheme) Not integrated yet Mass flux / Grell, Emmanuel schemes « Wet deposition » Giorgi, and Chameides, 1986 Giorgi, 1989 Dry deposition Fixed deposition velocities Surface emissions Input data Chemistry SO4-- SO2 Qian and Giorgi, 2001

  3. Direct effect Pronostic concentrations Radiative transfer model ( CCM3 rad pack) Optical properties of the tracer Specific extinction Fixed and characteristic of sulfates in our example Single scattering albedo Assymetry parameter The indirect effect (e.g. Qian and Giorgi, 1999) is not taken into account in the present version on the code

  4. PATCH One « generic tracer » Application : Source defined from GEIA 97 (BC) No chemistry Direct effect only (diffusive properties) ….Before the simulation ….. Go to the RegCM / Preproc directory and remove the Chemsrc directory rm –R Chemsrc Download Chemsrc.tar.gz file from the webpagehttp://www.ictp.trieste.it/~pubregcm/RegCM3/patch.html and copy it in RegCM /Preproc directory. Unzip and extract ( tar zxvf Chemsrc.tar.gz) … you should have a new Chemsrc directory …

  5. Preproc step Prepare : Terrain / ICBC for june 1997 (with the same domain as practise run) ……… 1997060100 1997070100 Preparation of tracer sources (interpolation of a global data set on the RegCM domain) go to RegCM/Preproc/Chemsrc Run the chsrfem.x script It generates the file CHEM-BC97 in RegCM/Input directory

  6. Simulation with tracers Create a new run directory for running tracer simulations Ex : RegCM / PractiseTrac Copy the regcm.x and regcm.in from the Regcm / Commons directory in the PractiseTrac directory Link the emission file into this run directory ln –sf ../Input/CHEM-BC97 . Run the model with tracer options edit regcm.in 5 days 1997060100 – 1997060500

  7. PATCH Post-processing with vis5D …. Before the post processing …. Remove the RegCM/Postproc-v5d directory Download the Postproc-v5d.tar.gz file and extract it in the RegCM directory Go to the directory Postproc-v5dand link here the simulation output fields : ln –sf ../ PractiseTrac /output/ATM.1997060100 . ln –sf ../ PractiseTrac /output/CHE.1997060100 . ln –sf ../ PractiseTrac /output/RAD.1997060100 .

  8. In Postproc-v5d Edit the postpv5d.in and set the control parameters Edit the postpv5d.param and set the run parameters Execute the postpv5d.x … it generates the P_OUT.v5d file ( if pressure grid) Execute vis5d P_OUT.v5d to visualise the file

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