Upload VE Climate Data Preparation Script

[lelavathy]

This issue is to upload and integrate a Python script that prepares ERA5-Land climate data for the Virtual Ecosystem (VE) model. The script:

1. Loads a TOML site definition with projected grid coordinates.
2. Loads monthly ERA5-Land NetCDF (2010–2020) climate data.
3. Converts units (K → °C, m → mm, Pa → kPa, J/m² → W/m²).
4. Adds derived variables such as relative humidity, mean annual temperature, and constant CO₂.
5. Interpolates ERA5-Land data to the TOML grid (90×90 m).
6. Reformats variables and coordinates to VE-style NetCDF.
7. Saves the processed dataset for use as VE climate driver inputs.

Additional Notes:

• The script uses numpy, xarray, tomllib, and pyproj.
• Spatial downscaling/topographic correction is not yet implemented.
• The output NetCDF follows VE conventions with x, y, and time_index dimensions.

This issue will serve as a reference for uploading, testing, and documenting the VE climate data preparation workflow.

Fixes #105

[lelavathy]

@vgro

Could you please review it and check the following:

1. Whether all required variables for the Virtual Ecosystem have been added.
2. Whether the unit conversions (temperature, precipitation, pressure, solar radiation, etc.) are correct.

[vgro]

This looks really good! I added a few points to update, but happy for you to merge this when the checks are successful

[davidorme]

@lelavathy I've now merged #86 so the cdsapi downloader script and my initial version of this script are now in analysis/abiotic so the only thing to do now is to move this file to the same location and then just review the metadata and code of the two versions so we can delete mine and replace it with this consolidated version?

[lelavathy]

@lelavathy I've now merged #86 so the cdsapi downloader script and my initial version of this script are now in analysis/abiotic so the only thing to do now is to move this file to the same location and then just review the metadata and code of the two versions so we can delete mine and replace it with this consolidated version?

@davidorme I have moved this file to analysis/abiotic. Basically, I have merged part of code from maliau_era5_download_reproject into my climate processing script. @vgro could you please review the merged script?

[vgro]

I wouldn't call this downscaling here, it's really just an interpolation

[lelavathy]

@davidorme I think we can delete this maliau_era5_download_and_reproject script. I have already integrated this script into maliau_climate_data_processing_script.

[vgro]

This part could be replaced with the comment you made in the other script about downscaling in the future

[vgro]

LGTM

[annarallings]

LGTM with @vgro requested changes