Aerosol-only simulation: Difference between revisions
| Line 64: | Line 64: | ||
Then pick the tracers you want to save, and type | Then pick the tracers you want to save, and type | ||
S25-56 # this is DMS .. SALC the 59-tracer SOA fullchem file | S25-56 # this is DMS .. SALC in the 59-tracer SOA fullchem file | ||
and when prompted for an output file name, type | and when prompted for an output file name, type | ||
Revision as of 22:07, 3 March 2011
Description
The aerosol simulation is an offline simulation for aerosol tracers only. It uses archived monthly mean OH, NO3, O3 and total nitrate concentrations archived from a previous full-chemistry simulation (more on that below), as well as production and loss rates for H2O2. This simulation does not provide "tagged" capabilities, but reduces the suite of tracers from full chemistry.
Assumptions
- OH concentrations are taken from a previously run full chemistry simulation. The default is from a much earlier version of the model, when OH thought to be more realistic. The standard code uses OH from version 5-07-08, with GEOS3 meteorology.
- O3, NO3 and total nitrate (HNO3+NIT) concentrations, as well as production rates and photolysis rates for H2O2 are taken from a previously run full chemistry simulation. The current default fields were produced from a GEOS-4, v7-02-03 simulation. These files are generally located in the sulfate_sim_200508/offline/ directory in your GEOS-Chem data directories.
Standard Tracers
In a complete aerosol-only simulation there are 29 tracers (see input.geos below). This list can be reduced by turning off any aerosol species (eg. SOA, dust, SS, etc).
Practicalities
Tracer list
The offline aerosol is simulation type 10. For a full set of aerosol tracers (based on the 59-tracer full-chemistry SOA simulation), the input.geos should look like this:
Type of simulation : 10 Number of Tracers : 31 Tracer Entries -------> : TR# Name g/mole Tracer Members; () = emitted Tracer #1 : 1 DMS 62.00 Tracer #2 : 2 SO2 64.00 Tracer #3 : 3 SO4 96.00 Tracer #4 : 4 MSA 96.00 Tracer #5 : 5 NH3 17.00 Tracer #6 : 6 NH4 18.00 Tracer #7 : 7 NIT 62.00 Tracer #8 : 8 H2O2 34.00 Tracer #9 : 9 BCPI 12.00 Tracer #10 : 10 OCPI 12.00 Tracer #11 : 11 BCPO 12.00 Tracer #12 : 12 OCPO 12.00 Tracer #13 : 13 ALPH 136.23 Tracer #14 : 14 LIMO 136.23 Tracer #15 : 15 ALCO 142.00 Tracer #16 : 16 SOG1 150.00 Tracer #17 : 17 SOG2 160.00 Tracer #18 : 18 SOG3 220.00 Tracer #19 : 19 SOG4 130.00 Tracer #20 : 20 SOG5 150.00 Tracer #21 : 21 SOA1 150.00 Tracer #22 : 22 SOA2 160.00 Tracer #23 : 23 SOA3 220.00 Tracer #24 : 24 SOA4 130.00 Tracer #25 : 25 SOA5 150.00 Tracer #26 : 26 DST1 29.00 Tracer #27 : 27 DST2 29.00 Tracer #28 : 28 DST3 29.00 Tracer #29 : 29 DST4 29.00 Tracer #30 : 30 SALA 36.00 Tracer #31 : 31 SALC 36.00
Run directories
We recommend that you create the run directory for your offline aerosol simulation from one of the GEOS-Chem full-chemistry run directories.
First, use Git to download the full-chemistry run directory (use the SOA option) for your desired met field type and resolution. For detailed instructions, please see Chapter 2.3: Downloading the GEOS-Chem run directories in the GEOS-Chem Online User's Guide.
Next, edit the TRACER MENU section of the input.geos file so that only the aerosol tracers are listed.
Next, create a new restart file that contains only the aerosol tracers. The easiest way to do this is with GAMAP. Start GAMAP and Then all you’d have to do is change the number of tracers in “input.geos”. You could also create a new restart file with GAMAP. Start GAMAP with:
gamap, file=’restart.4x5.geos5.2004010100', 'IJ-AVG-$'
Then pick the tracers you want to save, and type
S25-56 # this is DMS .. SALC in the 59-tracer SOA fullchem file
and when prompted for an output file name, type
restart.4x5.geos5.2004010100.aer_only
and press "OK". This will now be the restart file that you sue
You may also need to create an SOA restart file which contains the concentrations of various short-lived secondary organic aerosol quantities.
--Bob Y. 17:06, 3 March 2011 (EST)
Recent aerosol-only updates
1.
More Information
For more information, see the GEOS-Chem manual pages about offline aerosols:
http://acmg.seas.harvard.edu/geos/doc/man/chapter_6.html#6.1.6 http://acmg.seas.harvard.edu/geos/doc/man/appendix_1.html#A1.8