Fix dtype for Marrmot recipe results

[SarahAlidoost]

Description

• Closes Fix numpy dtype for Marrmot recipe results #2636
• Link to documentation:

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[valeriupredoi]

thanks @SarahAlidoost - looks good technically; note that CMOR standards say data should be float32 and coordinates' points float64, so not sure why the high precision here, but that's diag-specific stuff am guessing 👍

[Peter9192]

I can confirm this solved our problems with running marrmot.

[SarahAlidoost]

thanks @SarahAlidoost - looks good technically; note that CMOR standards say data should be float32 and coordinates' points float64, so not sure why the high precision here, but that's diag-specific stuff am guessing +1

Thanks for reviewing.