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Adaptative time step in WRF in the coupled model ROMS-AGRIF/WRF

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Posted by Anonymous at November 5 2014

Hi all,

I am using the adaptative time step in WRF (so that WRF adapts its time step as a function of the CFL).The time step of ROMS is 720 s and the coupling period is CPL=3600.

At t=0, ROMS sends its SST (SRMSSTV0, LAG=0) to WRF (WRF_d01_EXT_d01_SST) which receives it correctly. I would like then that WRF (WRF_d01_EXT_d01_SURF_NET_SOLAR, LAG=-3600) sends to ROMS the average field (TOYSRFL0). But LAG=-3600=-CPL is impossible with OASIS3-MCT !

I have the error : mod_oasis_advance:' ERROR lag out of dt range (-dt < LAG < dt)'

For the moment I put LAG=-3599 and I define oasis_time=-1 in oasis_put.

What can I do to have a proper coupling ?

Thanks, Best regards, Serena

Posted by Anonymous at November 6 2014

Hi Serena,

We discussed about your problem with Sophie and the condition LAG>-CPL in mod_oasis_advance is too strict in your case as your coupling has a physical meaning with LAG=-3600=-CPL .

Could you replace line 92 in mod_oasis_advance :

IF (lag > dt .OR. lag <= -dt) THEN

by

IF (lag > dt .OR. lag < -dt) THEN

Let us know if everything is still ok with this modification.

Best regards, Laure

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