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Description

We have saved CAM-chem simulation output that is intended to be used as boundary conditions for regional modeling. We used CAM-chem in the finite volume dynamical core, at 1 degree global horizontal resolution with 32 vertical levels. Meteorology is driven by specified dynamics, by nudging with 12h relaxation (10%) to MERRA2 reanalysis. Data is saved as instantaneous fields every 6 hours. See a list of saved species. Chemistry is calculated using the MOZART-T1 mechanism, described in Emmons et al. (2020). We use the MAM4-VBS scheme to model aerosols. Anthropogenic emissions are from CAMS-GLOB-ANTv5.1. Biogenic emissions are from online MEGAN2.1 modeled interactively via CLM. Fire emissions are from QFED CO2 x FINN emission ratios. Data Format: netCDF

  • File size: 1.79 GB per day (4 x 6-hour instantaneous time slices per day)

  • Data coverage: January 1, 2001 to December 30, 2022


Note

*** We have yet to simulate past 2022, and envision this could take some time as we finalize input datasets ***

For more recent dates, you could consider using the WACCM forecast for boundary conditions, which is available from January 1, 2023 to 10 days from now: https://www.acom.ucar.edu/waccm/register.shtml.

Get the data

1. Subset from dates within the time period January 1, 2001 to December 31, 2022

Regional and temporal subsetting can be found at: https://www.acom.ucar.edu/cesm/subset.shtml. Note there is a limit to download data in chunks of 32 days per download.

Image Added

2. Global files

Direct data download of global files is also available from the NCAR Research Data Archive; registration is required.

Reference

When using the data, please cite:

Panel

Tilmes, S., Emmons, L.K., Buchholz, R.R. & The CESM2 Development Team, (2022). CESM2.2/CAM-chem Output for Boundary Conditions. UCAR/NCAR - Atmospheric Chemistry Observations and Modeling Laboratory. Subset used† XXX, Accessed* dd mmm yyyy, DOI: https://doi.org/10.5065/XS0R-QE86.

†Please fill in the "subset used" with region and/or date of the subset you used (e.g. Lat: -10 to 10, Lon: 100 to 150, September 2015 - February 2016).

*Please fill in the "Accessed" date with the day, month, and year that you last accessed the data (e.g. - 5 Aug 2011).

Using the boundary conditions with WRF-Chem

The CAM-chem chemistry and aerosols for this run are identical to the WACCM forecasts. Mapping CAM-chem output to WRF-Chem chemistry schemes can be found in:
https://www2.acom.ucar.edu/sites/default/files/documents/CESM-WRFchem_aerosols_20190822.pdf

which is linked from this page:
https://www2.acom.ucar.edu/wrf-chem/wrf-chem-tools-community

Other simulations

Note

Old Boundary Conditions: CAM-chem simulations with CESM2.1 covering 2001 to 2020 can be found here: CESM2.1:CAM-chem as Boundary Conditions The dataset is no longer maintained.

Directions to access other experimental output can be found here: Benchmarks and Production