The Hindcast MERRA Family of simulations
All MERRA simulations are integrated at 2o latitude x2.5o longitude x 72 levels (surface-0.01 hPa) unless otherwise stated. Many of these used the Michael Prather ad hoc fix of JNO= 0.6 to resolve low NOx in the upper stratosphere. When we went to higher spatial resolution (1ox1.25o) the low NOx problem improved. Later, Luke Oman identified a problem with the FASTJX implementation (off by half a vertical level!), further improving our low NOx and a low tropical O3 problem. Hindcast MERRA2 simulations do not use this ad hoc adjustment.
D223 If the JNO value matters to the user, it is recommended that you look in the resource file to verify the JNO setting.
All the Hindcast MERRA chemistry simulations found and can be downloaded by starting with the Parent Directory: Index of /datashare/dirac/gmidata2/users/mrdamon/Hindcast-Family (nasa.gov)
All Hindcast MERRA Tracer simulations are here: Index of /datashare/dirac/gmidata2/users/steenrod/tracers (nasa.gov)
HindcastFFIgac2 (2 degree) MERRA-1
Emissions -
FF_emissions: varies yearly
BF_emissions: varies yearly
BB_emissions: varies yearly
SAD - Instead of using Y2000 Considine strat aerosols for every year, we used interannually varying for the entire length of the run. We used the new Igac aerosols, aka "IGAC v2 SAD"
Code tag information -
HindcastFFIgac2, all years: ssFixAddressErrorFastJ
Has the fix for the FastJX aerosol input. It's stratospheric O3 is essentially identical to 'minor bug'. Does not have aero/fastjx bug!
HindcastFFIgac2-HighRes (1 degree) MERRA1 1990-present day
This simulation improves its representation of stratospheric ozone and its depletion. We had a low O3 bias in the tropical source region (nearly 1 ppm) and this was impacting our simulation of polar O3. We have tested some changes to the chemistry that are aimed at improving both the low bias and the rate of Antarctic depletion. New stations for NDACC instrument teams have been added.
Hindcast3Igac2 MERRA-1
FF_emissions: held at year 2000
BF_emissions: held at year 2000
BB_emissions: held at year 2000
SAD -
Instead of using Y2000 Considine strat aerosols for every year, we used interannually varying for the entire length of the run. We used the new Igac aerosols, aka "IGAC v2 SAD"
Hindcast3Igac2, all years: ssFixAddressErrorFastJ
Hindcast_CCMI MERRA-1
FF_emissions: vary yearly and monthly
BF_emissions: vary yearly and monthly
BB_emissions: vary yearly and monthly
SAD - Interannually varying for the entire length of the run. We use the new Igac aerosols, aka "IGAC v2 SAD"Surface Boundary Conditions -
Includes recommendations from CCMI for the Ref-C1 and Ref-C1SD simulations. See README file for more information.
Has the fix for the FastJX aerosol input. Stratospheric O3 is essentially identical to 'minor bug'. Does not have aero/fastjx bug!
Hindcast MERRA-1
FF_emissions: same each year
BF_emissions: same each year
Hindcast, 90-96: stationDataOnAllLevels
Hindcast, 99-01: deallocateFixLandWater
Minor bug: sea salt bins missing. Shows negligible chemical changes - <<1% in anything.
Hindcast, 02-12 & 93-94 re-run: jkTrunk_with_Intel11_compiler-m02
The 'overflow' bug caused a decrease in strat O3 centered on 6 mb and 22N of roughly 25 ppb at the most. This is at most a 0.3% error. There were minor perturbations to tropospheric species but I really don't have any details on that.
Please see the README file for more information
HindcastFF MERRA-1
HindcastFF, all years: jkTrunk_with_Intel11_compiler-m02
Hindcast3 MERRA-1
SAD inputs are year varying. IGAC SAD data starts in 2000.
Hindcast3, all years: jkTrunk_with_Intel11_compiler-m02
Hindcast3Igac MERRA-1
SAD - Y2000 Considine strat aerosols for every year
Hindcast3Igac, all years: jkTrunk_with_Intel11_compiler-m02
