Diagnostic fields for downscaling

[gold2718]

What is the feature/what would you like to discuss?

To ease the downscaling group's use of NorESM atmosphere output, some new fields should be added to CAM:

• Fraction of wet days per month (> 1 mm / day) (FRAC_WETDAYS)
  • This can be collected as an outfld call once per day (at 00:00) with a zero or a one.
  • With monthly averaged output (standard h0a), this will output correct quantity
• Monthly average of total precipitation only counting wet days (PREC_TOT_WETDAYS)
  • Keep a running total of precipitation during a day (reset at 00:00). This is also needed for FRAC_WETDAYS
  • Call outfld with the day's total precipitation only if > 1 mm.
• I had in mind the standard deviation of the daily mean 2m surface air temperature over a season (DJF, MAM, JJA, & SON)
  • CAM does not usually save seasonal fields. They are computed per outfld call with collection frequency determined by the namelist.
  • One idea is to create a special 3-month output file. This would only work if the experiment fun starts off at a season boundary (instead of a year boundary).
  • Another idea is to keep track of seasons internally and call outfld only at the season end. Only non-zero entries would be used by post-processing tools.

Is there anyone in particular you want to be part of this conversation?

@brasmus

Will this change (regression test) answers?

No

Will you be implementing this enhancement yourself?

Yes