Aerosol-only simulation

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  1. Simulations using KPP-built mechanisms
  2. Aerosol-only simulation
  3. CH4 simulation
  4. CO2 simulation
  5. Hg simulation
  6. POPs simulation
  7. Tagged CO simulation
  8. Tagged O3 simulation
  9. TransportTracers simulation


On this page we describe the aerosol-only (a.k.a. offline aerosol) simulation.

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.

NOTES:

  1. The aerosol-only simuation is currently functional in GEOS-Chem Classic.
  2. There is currently no aerosol-only run directory for GCHP. Interested users are encouraged to make this modification on their own.
  3. OH concentrations are archived from the most recent 10-year benchmark simulation.
  4. O3, NO3 and total nitrate (HNO3+NIT) concentrations, as well as production rates and photolysis rates for H2O2 are archived from the most recent 10-year benchmark simulation.

--Bob Yantosca (talk) 16:06, 25 August 2022 (UTC)

Practicalities

As with all other Offline chemistry simulations, the GEOS-Chem user community shall be responsible for the scientific content and validation of the aerosol-only simulation.

The SOA simulation was updated in GEOS-Chem v9-02o to include a better tracer lumping scheme, as shown in Figure 1 of Pye et al. 2010.

The offline aerosol is simulation type 10. For a full set of aerosol tracers (based on the 100-tracer full-chemistry SOA simulation), the input.geos should look like this:

Type of simulation      : 10
Number of Tracers       : 47
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   SO4s    96.00
Tracer #5               :  5   MSA     96.00
Tracer #6               :  6   NH3     17.00
Tracer #7               :  7   NH4     18.00
Tracer #8               :  8   NIT     62.00
Tracer #9               :  9   NITs    62.00
Tracer #10              : 10   H2O2    34.00
Tracer #11              : 11   BCPI    12.00
Tracer #12              : 12   OCPI    12.00
Tracer #13              : 13   BCPO    12.00
Tracer #14              : 14   OCPO    12.00
Tracer #15              : 15   DST1    29.00
Tracer #16              : 16   DST2    29.00
Tracer #17              : 17   DST3    29.00
Tracer #18              : 18   DST4    29.00
Tracer #19              : 19   SALA    36.00
Tracer #20              : 20   SALC    36.00
Tracer #21              : 21   MTPA   136.23
Tracer #22              : 22   LIMO   136.23
Tracer #23              : 23   MTPO   136.23
Tracer #24              : 24   TSOG1  150.00
Tracer #25              : 25   TSOG2  150.00
Tracer #26              : 26   TSOG3  150.00
Tracer #27              : 27   TSOG0  150.00
Tracer #28              : 28   TSOA1  150.00
Tracer #29              : 29   TSOA2  150.00
Tracer #30              : 30   TSOA3  150.00
Tracer #31              : 31   TSOA0  150.00
Tracer #32              : 32   ISOG1  150.00
Tracer #33              : 33   ISOG2  150.00
Tracer #34              : 34   ISOG3  150.00
Tracer #34              : 35   ISOA1  150.00
Tracer #36              : 36   ISOA2  150.00
Tracer #37              : 37   ISOA3  150.00
Tracer #38              : 38   BENZ    12.00   (6C)
Tracer #39              : 39   TOLU    12.00   (7C)
Tracer #40              : 40   XYLE    12.00   (8C)
Tracer #41              : 41   ASOG1  150.00
Tracer #42              : 42   ASOG2  150.00
Tracer #43              : 43   ASOG3  150.00
Tracer #44              : 44   ASOAN  150.00
Tracer #45              : 45   ASOA1  150.00
Tracer #46              : 46   ASOA2  150.00
Tracer #47              : 47   ASOA3  150.00

This list can be reduced by turning off any aerosol species (eg. SOA, dust, SS, etc). You may also run without the secondary organic aerosols (MTPA, LIMO, MTPO, TSOG0–3, TSOA0–3, ISOG1–3, ISOA1–3, ASOG1–3, ASOA1–3, ASOAN) if you wish (but we recommend that you use them).

--Melissa Sulprizio 12:51, 5 November 2013 (EST)