How to output time-step rain values?

[yanhongyi]

I've known that using output_diagnostics = 1 in &time_control would be helpful. I also set auxhist3_outname and related vars needed in &time_control.

I successfully output wrfxtrm, but I only see RAINNCVMEAN\RAINNCMAX and so on in it, I don't have the RAINNCV and RAINCV.

I don't know which variable is time-step rain, and the unit of RAINNCVMEAN\RAINNCMAX... is kg/m2/s....I don't know how to deal with it...

 

[Ming Chen]

When you set output_diagnostics = 1, you will get the following variables in wrfxtrm files:
t2min,t2max,tt2min,tt2max,t2mean,t2std,q2min,q2max,tq2min,tq2max,q2mean,q2std,skintempmin,skintempmax,tskintempmin,tskintempmax,skintempmean,skintempstd,u10max,v10max,spduv10max,tspduv10max,u10mean,v10mean,spduv10mean,u10std,v10std,spduv10std,raincvmax,rainncvmax,traincvmax,trainncvmax,raincvmean,rainncvmean,raincvstd,rainncvstd

RAINNCV and RAINCV are not supposed to be included in wrfxtrm files.

The unit of RAINNCVMEAN\RAINNCMAX... is kg/m2/s, which is equivalent to mm/s.

RAINCV and RAINNCV are time-step convective and resolved scale precipitation, respectively.

 

[francescomaicu]

Dear Ming,
I need a clarification regarding

" RAINCV and RAINNCV are time-step convective and resolved scale precipitation, respectively."

I'm running a simulation with an history_interval of 3 hours and files with 8 frames, i.e. 1 day for each output file.
RAINC, RAINNC, RAINSH are accumulated along all the simulation, and not reset to zero in each history file.

RAINCV and RAINNCV are time-step ...

I have 15 secs time step. RAINCV that is written at second time interval (let's say 2020-09-16_06:00:00) is the value accumulated in the previous 15 seconds or in the previous 3 hours?
In case, how can I get the accumulated of RAINC, RAINNC andRAINSH over the 3 hours?
Thank you
Francesco

 

[Ming Chen]

Francesco,

Let's suppose you have output files save at 3-hour intervals, for example, wrfout.00hr, wrfout.03hr, wrfout.06hr, ...
You can always extract rain and rainnc from each wrfout files, and the difference between the two consecutive times of wrfout will be the 3-hour accumulative precipitation.

 

[Ming Chen]

We don't recommend using RAINCV and RAINNCV, because these two variables are instantaneous and they cannot represent precipitation over a specific period.

 

[francescomaicu]

Thank you very much Ming.
I also tried and verified that setting prec_acc_dt in the namelist works well!