pcmdi_metrics.utils.apply_oceanmask

pcmdi_metrics.utils.apply_oceanmask(obj, data_var=None, landfrac=None, land_criteria=0.8, ocean_criteria=0.2)[source]

Apply an ocean mask to a given DataArray or Dataset.

This function is a wrapper around apply_landmask that specifically masks land areas, effectively creating an ocean mask.

Parameters:

  • obj (Union[xr.Dataset, xr.DataArray]) – The Dataset or DataArray to which the ocean mask will be applied.

  • data_var (str, optional) – Name of the DataArray in the Dataset. Required if obj is a Dataset.

  • landfrac (xr.DataArray, optional) – Land fraction data array. Values should range from 0 (ocean) to 1 (land). If None, a land-sea mask will be created automatically.

  • land_criteria (float, optional) – Threshold for considering a grid cell as land. Default is 0.8.

  • ocean_criteria (float, optional) – Threshold for considering a grid cell as ocean. Default is 0.2.

Returns:

xr.DataArray – DataArray with the ocean mask applied (land areas masked).

See also

apply_landmask

The underlying function used to apply the mask.

Examples

>>> from pcmdi_metrics.utils import apply_oceanmask
>>> da_ocean = apply_oceanmask(da, landfrac=mask)
>>> ds_ocean = apply_oceanmask(ds, data_var="ts", landfrac=mask)