Opened 8 years ago
Closed 7 years ago
#1092 closed help (answered)
Radiation diagnostics on different timestep to other variables?
Reported by: | Emma_Turner | Owned by: | um_support |
---|---|---|---|
Component: | UM Model | Keywords: | timestep radiation |
Cc: | Platform: | HECToR | |
UM Version: | 6.6.3 |
Description
Hello,
I am confused as to what has happened with my radiation timesteps appearing at different times to all other variables. I am using a 15 hour timestep with the 30 day month so in Atmosphere - Scientific Parameters and Sections - Time-stepping, the 'Number of timesteps per 'period' I have is 48, and 'Number of days per 'period is 1. At the bottom the 'Convection calling frequency (Timesteps)' is 3, and both the 'Number of calculations of SW/LW radiation increments per day' are 8.
As my timestep is every 15 hours some daily .pp files contain 2 timesteps (time0) and some contain 1. The radiation outputs I have now asked for (e.g. section 2, item 205 outgoing LW rad flux (TOA)) are appearing with a separate time coordinate time1, whose values are very similar to time0 but about 0.02 days out (time is in days since 1970-01-01). Also sometimes the timestep is in the next file along.
E.g.
Day 1 time0 13259.38, 13260
Day 1 time1 13259.4
Day 2 time0 13260.62
Day 2 time1 13260.02, 13260.65
I thought I was for filling all the requirements for frequency of radiation calls being integer multiples of the timestep. But I must have missed something.
Can you help?
Many thanks
Emma
Change History (7)
comment:1 Changed 8 years ago by jeff
comment:2 Changed 8 years ago by Emma_Turner
Hi Jeff,
The job id is xihtfa I don't know if you can see the files at /home/d43/d43-geos-climate/eturner/work/um/xihtf/M ? You might not have access rights.
OK by timestep do you mean the one I set, in this case 15 hours? Maybe it is a rounding problem if that is the case, where the 2 times, time0 and time1, are rounded to different values as they are very close.
Thanks
Emma
comment:3 Changed 8 years ago by jeff
I take it you mean job xihtf? I don't know what you mean by a 15 hour timestep, the timestep for this job is 30 minutes.
Jeff.
comment:4 Changed 8 years ago by Emma_Turner
Yes that is right. By 15 hour timestep I mean that we are only obtaining output every 15 hours.
Thanks
Emma
comment:5 Changed 8 years ago by Emma_Turner
I have looked at the data and am I right in thinking that the LW radiation timestep is also 1 timestep after the SW timestep? Looking at my data I have time0 (most variables), time1 (SW variables) and time2 (LW variables). However there is some confusion as the variable: Outgoing LW radiation flux (TOA) which is STASH section 2, item 205 is a LW radiation variable, but has time1 (SW radiation) as its time coordinate? Can you help?
Thanks
Emma
comment:6 Changed 8 years ago by jeff
I really need to see some of the UM output files, if they aren't too big can you copy a couple of files to puma, the original data and your converted data if you still have them.
Jeff.
comment:7 Changed 7 years ago by annette
- Resolution set to answered
- Status changed from new to closed
Emma,
I'm assuming we can close this ticket as there hasn't been a response in a while. You can reopen the ticket or create a new one if you further issues.
Annette
Hi Emma
I'm a bit confused with your explanation here, maybe if you could give the jobid things would be clearer. One thing to note is the radiation diagnostics are always output 1 time step later than the other diagnostics.
Jeff.