Add structured.circulation_model.py

Author: VeckoTheGecko

parcels/_datasets/__init__.py

@@ -36,7 +36,7 @@
 
 This subpackage is broken down into structured and unstructured parts. Each of these have common submodules:
 
-* ``circulation_model`` -> hardcoded datasets with the intention of mimicking datasets from a certain (ocean) circulation model
+* ``circulation_model`` -> hardcoded datasets with the intention of mimicking dataset structure from a certain (ocean) circulation model
 * ``generic`` -> hardcoded datasets that are generic, and not tied to a certain (ocean) circulation model. Instead these focus on the fundamental properties of the dataset
 * ``generated`` -> functions to generate datasets with varying properties
 * ``utils`` -> any utility functions necessary related to either generating or validating datasets

parcels/_datasets/structured/circulation_model.py

@@ -0,0 +1,11 @@
+import xarray as xr
+
+
+def _nemo_data() -> xr.Dataset:
+    """Dataset matching NEMO model output.
+
+    Example dataset is based off of data from MOi GLO12.
+
+    https://www.mercator-ocean.eu/en/solutions-expertise/accessing-digital-data/product-details/?offer=4217979b-2662-329a-907c-602fdc69c3a3&system=d35404e4-40d3-59d6-3608-581c9495d86a
+    """
+    ...

parcels/_datasets/structured/generic.py

@@ -1,5 +1,3 @@
-"""Datasets focussing on grid geometry"""
-
 import numpy as np
 import xarray as xr