7.4.3.3. ERA5 Wave Direction Dataloader

ERA5 is a family of data products produced by the European Centre for Medium-Range Weather Forecasts (ECMWF). It is the fifth generation ECMWF atmospheric reanalysis of the global climate covering the period from January 1950 to present.

From their website:

ERA5 provides hourly estimates of a large number of atmospheric, land and oceanic climate variables. The data cover the Earth on a 30km grid and resolve the atmosphere using 137 levels from the surface up to a height of 80km. ERA5 includes information about uncertainties for all variables at reduced spatial and temporal resolutions.

Name in config: 'era5_wave_direction'

Instructions for how to download their data products are available here

This dataloader takes the mean wave direction variable, which gives the direction the waves are coming from as an angle from north in degrees, and converts it to a unit vector with u and v components.

class meshiphi.dataloaders.vector.era5_wave_direction_vector.ERA5WaveDirectionLoader(bounds, params)

import_data(bounds)

Reads in wave direction data from a ERA5 NetCDF file. Renames coordinates to ‘lat’ and ‘long’ and calculates unit vector from mean wave direction variable ‘mwd’.

Parameters:

bounds (Boundary) – Initial boundary to limit the dataset to

Returns:

ERA5 wave dataset within limits of bounds. Dataset has coordinates ‘lat’, ‘long’, and variables ‘uW’, ‘vW’

Return type:

xr.Dataset