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Meridional sum up in curvilinear grid

Added by Estanislao Gavilan 7 months ago

Dear Community,

I want to estimate the meridional overturning circulation from CMIP6 experiments. The CMIP6 models use curvilinear grids in the ocean, therefore I cannot use the meridional stats commands. I wonder if there is a way to select the data in equal latitude bands, and then sum the longitude point in those bands. I know I can remap the data, but I would like to know if it is possible without remapping.

Kind regards,

Estanislao


Replies (6)

RE: Meridional sum up in curvilinear grid - Added by Ralf Mueller 7 months ago

hi Estanislao!

Conservative interpolation to a regular grid before the meridional operation is not an option?

cheers
ralf

RE: Meridional sum up in curvilinear grid - Added by Ralf Mueller 7 months ago

I talked to Uwe: zonmean actually works for unstructured grids, but for meridional overturning you possibly need the un-weighted version, right?

RE: Meridional sum up in curvilinear grid - Added by Estanislao Gavilan 7 months ago

Hi Ralph,

thank you so much for your help. I managed to computed it using xarray, but it takes too much time because I need to loop the time and the vertical levels (memory issues). I cannot use zonemean because I want to compute the sum at each latitude band. I saw the other commands require regular lat/lon grid. I will try to remap it, and see how it goes.
Kind regards,

Estanislao

RE: Meridional sum up in curvilinear grid - Added by Ralf Mueller 7 months ago

Uwe also mentioned the remapsum operators for a non-weighted sum in the horizontal. but this one might have problems with speficic cells. maybe it's worth a try.

RE: Meridional sum up in curvilinear grid - Added by Ralf Mueller 7 months ago

Just found an article on this topic for unstructured grids: https://gmd.copernicus.org/articles/13/3337/2020/. Might be a bot more abstract than needed for you source grid - I don't know

RE: Meridional sum up in curvilinear grid - Added by Uwe Schulzweida 7 months ago

I worked on the zonal bins support for the Remapstat module (remapsum,...) yesterday. This feature will be available in CDO release 2.3.0.

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