CH4 hydropower emission files are incompatible with GCHP

[yantosca]

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Description of your issue or question

The recently-added CH4 emission files from hydropower (Delwiche et al 2023) are incompatible with GCHP because the time dimension is int and not float or dble. Here is the output from the isCoards script

===========================================================================
Filename: ResME_Dam_Emissions.0.1x0.1.nc
===========================================================================

The following items adhere to the COARDS standard:
---------------------------------------------------------------------------
... several COARDS-compiliant items not shown ...

The following items DO NOT ADHERE to the COARDS standard:
---------------------------------------------------------------------------
Variable "time" is of type "int" (problem for GCHP)

The following optional items are RECOMMENDED:
---------------------------------------------------------------------------
-> Consider adding time:axis = "T"
-> Consider adding the "format" global attribute

===========================================================================
Filename: ResME_Surface_Emissions.0.1x0.1.nc
===========================================================================

The following items adhere to the COARDS standard:
---------------------------------------------------------------------------
... several COARDS-compiliant items not shown ...

The following items DO NOT ADHERE to the COARDS standard:
---------------------------------------------------------------------------
Variable "time" is of type "int" (problem for GCHP)

The following optional items are RECOMMENDED:
---------------------------------------------------------------------------
-> Consider adding time:axis = "T"
-> Consider adding the "format" global attribute

Tagging @msulprizio.

Also see related issues:

• Fixes for the carbon simulation  #1992
• Issues to be resolved in the carbon simulation #1984

[yantosca]

NOTE: The ResME_Dam_Emissions.01x01.nc and ResME_Surface_Emissions.01x01.nc files have been modified for GCHP as follows:

1. The time dimension has been changed from int to float, for compatibility with MAPL ExtData:

$ ncap2 -s 'time=float(time)' ResME_Dam_Emissions.0.1x0.1.nc out.nc
$ mv out.nc  ResME_Dam_Emissions.0.1x0.1.nc
$ ncap2 -s 'time=float(time)' ResME_Surface_Emissions.0.1x0.1.nc out.nc
$ mv out.nc  ResME_Dam_Emissions.0.1x0.1.nc

2. The time:axis attribute has been set to T. (Not required but this is a recommended update).

$ ncatted -a axis,time,o,c,'T' ResME_Dam_Emissions.0.1x0.1.nc
$ ncatted -a axis,time,o,c,'T' ResME_Surface_Emissions.0.1x0.1.nc

3. Chunking and deflating were re-applied:

$ nc_chunk.pl ResME_Dam_Emissions.0.1x0.1.nc 1
$ nc_chunk.pl ResME_Surface_Emissions.0.1x0.1.nc 1

[yantosca]

Note: Users will have to re-download these files.