To cite the data directly, please use:
BBuchholz, 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).