Help Needed: Loading Multiple HYCOM Hourly Files

[claudio-iturra]

Dear all, I have downloaded hourly HYCOM files over one month. Normally, I work with a single large file containing all dates, but this time I had to download the measurements separately using a Python script due to download constraints.

When attempting to load all files into the FieldSet, I encountered an error that prevents me from following my usual workflow. I would greatly appreciate any guidance on how to: Properly load all individual files, Select a specific depth level, Specify a particular time range.
Each file has the following structure:

Not working

filenames = {
    "U": sorted(glob.glob('/home/cl/Documents/Parcel/200501/*.nc')),
    "V": sorted(glob.glob('/home/cl/Documents/Parcel/200501/*.nc')),
}
variables = {
    'U': 'water_u',
    'V': 'water_v'
}
dimensions = {
    'lat': 'lat',
    'lon': 'lon',
    'time': 'time',
    'depth': 'depth'
}

fieldset = parcels.FieldSet.from_nemo(filenames, variables, dimensions)

[VeckoTheGecko]

Could you provide more information here?

• what does the error message from Parcels say? (Copy paste this into your question)
• what version of Parcels are you using? print(parcels.__version__)
• are you sure the glob is picking up the files you want? (What do you see if you print sorted(glob.glob(...))

[claudio-iturra]

Thanks so much for your response. I already fixed the problem; I just merged all the HYCOM files.

ds = xr.open_mfdataset('*.nc', combine='by_coords')

No matter how I tried, I couldn't load multiple files into Parcels. Merging the files into one nc file works great!

• I'm using Parcels version 3.1.1

[VeckoTheGecko]

Awesome, great to hear that this works for your dataset.