New Boundary Conditions: A new simulation with more consistent input data across a longer time range, and newer CESM codebase has been completed. CESM2.2:CAM-chem as Boundary Conditions The dataset below is being depreciated. |
Description
We have saved CAM-chem simulation output that is intended to be used as boundary conditions for regional modeling. We used CAM-chem at 0.9x1.25 horizontal resolution simulation with 56 vertical levels. Meteorology is driven by specified dynamics, by nudging with 50h relaxation (1%) to MERRA2 reanalysis. Data is saved as instantaneous fields every 6 hours. See a list of saved species. Chemistry is the MOZART-T1 mechanism, described in Emmons et al. (2019). You can find a description of all simulated species online. We use the MAM4-VBS scheme to model aerosols. Files are collected as daily information (4 time-slices per file). Anthropogenic emissions are from CMIP6, CMIP6 2014 anthropogenic emissions are repeated for dates past 2014 to 2016. Anthropogenic and "other" emissions are changed to SSP5-85 for 2017 onwards. Biogenic emissions are from online MEGAN2.1, fire emissions are from QFED CO2 x FINN emission ratios (from 2015), with emission ratios updated from 2017 onwards. Note that fire emitted DMS 2001-2015 is from CMIP6, in 2016 from GFAS and 2017 onwards from QFED. SST in 2020 are repeated from 2019.
*** NOTE: This version of output has incorrect HCN and O3S, please do not use these species *** |
Get the data
Regional and temporal subsetting can be found at: https://www.acom.ucar.edu/cam-chem/cam-chem.shtml. Note there is a limit to download data in chunks of 32 days per download.
Direct data download of global files is also available from the NCAR Research Data Archive; registration is required.
*** Boundary conditions will not be updated with this simulation configuration past 2020 *** For more recent dates, you could consider using the WACCM forecast for boundary conditions, which is available from January 1, 2020 to 10 days from now: https://www.acom.ucar.edu/waccm/register.shtml. |
An alternate way to access any of the complete dataset of shared files between January 2001 and December 2020 is via a Globus account, which requires a Google account. Get Globus access here.
Once you can log into Globus, the boundary conditions are stored here:
January 2001 to June 2017: https://app.globus.org/file-manager?origin_id=2acef47e-ed07-11e8-8cae-0a1d4c5c824a&origin_path=%2F
January 2017 to June 2020: https://app.globus.org/file-manager?origin_id=a0e862f4-772b-11e9-bf47-0e4a062367b8&origin_path=%2F
Files can be transferred to another location using the Globus system. To set up a transfer point see the relevant page:
OSX:
https://docs.globus.org/how-to/globus-connect-personal-mac
Windows:
https://docs.globus.org/how-to/globus-connect-personal-windows
Linux:
https://docs.globus.org/how-to/globus-connect-personal-linux
Note: direct download option from this site is in beta testing phase and should be available in the future.
To cite the data directly, please use:
Buchholz, R. R., Emmons, L. K., Tilmes, S., & The CESM2 Development Team, (2019). CESM2.1/CAM-chem Instantaneous Output for Boundary Conditions. UCAR/NCAR - Atmospheric Chemistry Observations and Modeling Laboratory. Subset used† XXX, Accessed* dd mmm yyyy, https://doi.org/10.5065/NMP7-EP60. †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). |
We suggest to also cite the following paper that discusses the new configuration of CESM2/CAM-chem and assesses chemical species, including using output from this boundary condition simulation.
2020). The Chemistry Mechanism in the Community Earth System Model version 2 (CESM2). Journal of Advances in Modeling Earth Systems, 12, e2019MS001882, https://doi.org/10.1029/2019MS001882. , , , , , , et al., ( |
Directions to access other experimental output can be found here: Benchmarks and Production
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