Run SD-WACCM compset with perpetual year (using MERRA)

[daniele_minganti@aeronomie_be]

Hello everyone,I have succesfully run SD-WACCM compset using GEOS5 dataset. Now I would like to use the MERRA dataset to perform further SD-WACCM runs (I am using version 1.2.2 of CESM).In particular I would like to know if it is possible to set a perpetual year (say 2000) as atmospheric forcing. In other words I would like to use the same year of the MERRA dataset for the nudging instead of every year of the run.Is that possible? I did not find any useful documentation about this topic. I am asking because I need to do long runs, and then compare the results with other models, which use perpetual year as atmospheric forcing.Thank you,regardsDaniele Minganti  

 

[mmills]

This is not a configuration that we generally support. However, it has been done recently for this study:Solomon, S., D. J. Ivy, D. E. Kinnison, M. J. Mills, R. R. Neely III, and A. Schmidt (2016), Emergence of healing in the Antarctic ozone layer, Science, 353(6296), aae0061–274, doi:10.1126/science.aae0061.The method used was to copy the met field files from the year 1999 into subsequent years 2000 to 2016. If you have acces to NCAR's Yellowstone cluster, you can find the filenames lists and subdirectories here:/glade/p/acd/met_data/MERRA1999

 

[mmills]

This is not a configuration that we generally support. However, it has been done recently for this study:Solomon, S., D. J. Ivy, D. E. Kinnison, M. J. Mills, R. R. Neely III, and A. Schmidt (2016), Emergence of healing in the Antarctic ozone layer, Science, 353(6296), aae0061–274, doi:10.1126/science.aae0061.The method used was to copy the met field files from the year 1999 into subsequent years 2000 to 2016. If you have acces to NCAR's Yellowstone cluster, you can find the filenames lists and subdirectories here:/glade/p/acd/met_data/MERRA1999

 

[daniele_minganti@aeronomie_be]

Thank you for the answer.I do not have access to your machine, but if I undersand well I should create a new file list (for example in $CESM_ROOT/input_data/atm/cam/met), then I should modify it as in the attachment (if I want to do a run from 1980 to 1990 for example).In other words for each year of the simulation I should always set the perpetual year that I want to use (say 2000). Of course I should also create as much subdirectories as the number of years that I want to consider (in the MERRA directory, the directories 1980,1981,...,1990), and then copy the same year in each of those subdierctories.Is it correct?Daniele Minganti 

 

[daniele_minganti@aeronomie_be]

Thank you for the answer.I do not have access to your machine, but if I undersand well I should create a new file list (for example in $CESM_ROOT/input_data/atm/cam/met), then I should modify it as in the attachment (if I want to do a run from 1980 to 1990 for example).In other words for each year of the simulation I should always set the perpetual year that I want to use (say 2000). Of course I should also create as much subdirectories as the number of years that I want to consider (in the MERRA directory, the directories 1980,1981,...,1990), and then copy the same year in each of those subdierctories.Is it correct?Daniele Minganti