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
Aerosols ( droplets, smoke particles, dust, pollens, flying cats …)
Gazeous phase, chemical species
Evolution of concentration (mixing ratio)
Qian and Giorgi, 1999
Physico – chemical transformations
Strongly dependant on the nature of the tracer
Horizontal and vertical advection
Horizontal and vertical diffusion
derived from water vapor and cloud water
(mm4 Anthes et al., 1987)
« Well-mixing approximation »
Rq : Tan et al., 2002 scheme ( work with Kuo-scheme)
Not integrated yet
Mass flux / Grell, Emmanuel schemes
« Wet deposition »
Giorgi, and Chameides, 1986
Fixed deposition velocities
Qian and Giorgi, 2001
Radiative transfer model
( CCM3 rad pack)
Optical properties of the tracer
Fixed and characteristic of sulfates in our example
Single scattering albedo
The indirect effect (e.g. Qian and Giorgi, 1999) is not taken into account in the present version on the code
One « generic tracer »
Source defined from GEIA 97 (BC)
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 …
Prepare : Terrain / ICBC for june 1997
(with the same domain as practise run)
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
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
5 days 1997060100 – 1997060500
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 .
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