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Conservative remapping from reduced Gaussian to tripolar grid

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Conservative remapping from reduced Gaussian to tripolar grid

Posted by Anonymous at July 17. 2018

Hi

I'm trying to using OASIS3-MCT2.8 to couple the OpenIFS model (reduced Gaussian N80 grid) to the NEMO ocean model (tripolar ORCA05 grid). I've been using the following settings in namcouple

# Field 11 Atmosphere heat flux to ocean (globally conserved)

A_QsrMix:A_QnsMix O_QsrMix:O_QnsMix 7 10800 4 flxatmos EXPOUT

35718 1 722 511 atmo opat LAG=3600 SEQ=1

P 0 P 2

LOCTRANS SCRIPR MAPPING CONSERV

INSTANT

BILINEAR D SCALAR LATITUDE 40 FRACNNEI FIRST

rmp_atmo_to_opat_BILINEAR_FRACNNEI_D_TL159_ORCA05.nc src

GLBPOS

The model runs fine, but when I compare the output files, I find that neither variable is conserved during the remapping. Global sum of A_QsrMix is very close to global sum of O_QsrMix, but for A_QnsMix and O_QnsMix theres a clear offset.

I tried setting # Field 11 Atmosphere heat flux to ocean (globally conserved)

A_QsrMix:A_QnsMix O_QsrMix:O_QnsMix 7 10800 4 flxatmos EXPOUT

35718 1 722 511 atmo opat LAG=3600 SEQ=1 P 0 P 2

LOCTRANS SCRIPR MAPPING CONSERV

INSTANT

CONSERV D SCALAR LATITUDE 1 FRACNNEI FIRST

rmp_atmo_to_opat_CONSERV_FRACNNEI_D_TL159_ORCA05.nc src

GLBPOS

but this caused the model to crash. No error message from OASIS, but the traceback points me to "float invalid" on the line grid1_centroid_lat = grid1_centroid_lat/grid1_area in libscrip/remap_conserv.F, so I'm guessing grid1_area becomes 0 for some reason? Does anyone have an idea about what the problem could be? Is there some setting I have overlooked? Is there a way to get the fields to be globally conserved without conservative remapping?

Any help is much appreciated! Best regards Joakim

Re: Conservative remapping from reduced Gaussian to tripolar grid

Posted by Anonymous at November 22. 2018

Hi,

The comment below was blocked on the web site and never arrived to the moderator of the site until last tuesday. We are trying to understand what happened.

Did you solve your problem ?

Best regards, Laure

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