CMEMS

This example runs an OceanDrift simulation with current data downloaded from CMEMS To run this example, you need a CMEMS account created at https://marine.copernicus.eu, and you need to install the motuclient: python -m pip install motuclient

CMEMS username and password should be stored in a .netrc file with contents: ``` machine cmems

login <your username> password <your password>

```

import os
from datetime import datetime, timedelta
import numpy as np

from opendrift.models.oceandrift import OceanDrift
from opendrift.readers import reader_cmems
from opendrift.readers import reader_netCDF_CF_generic

Seed information

lon = 4.8; lat = 60  # Bergen, Norway
lon = -89; lat = 29.8  # New Orleans
lon = 107; lat = 10  # Ho Chi Minh
lon = 123; lat = -16.3  # Australia


time = datetime.utcnow()
duration = timedelta(days=3)
bufferlat = duration.total_seconds()/111000
bufferlon = bufferlat*np.cos(lat*np.pi/180)

By intialisation, only an XML-file with the contents is downloaded. The netCDF file with data is downloaded later, after the simulation is started, when necessary coverage (time/space) is known ( <reader>.prepare() )

cmems = reader_cmems.Reader(
    dataset='global-analysis-forecast-phy-001-024-hourly-merged-uv',
    variable_mapping={  # Overriding the mapping in reader_cmems.py
        'utotal': 'x_sea_water_velocity',
        'vtotal': 'y_sea_water_velocity',
        'utide': 'sea_ice_x_velocity',   # Fake mapping, as standard_name
        'vtide': 'sea_ice_y_velocity'})  # must be unique for a reader

o = OceanDrift()

o.add_reader(cmems)
o.seed_elements(lon=lon, lat=lat, number=5000, radius=1000, time=time)
o.run(duration=duration)

# Although total current (SMOC) has been used as forcing, we plot the tidal current as background field, disguised as ice velocity
o.animation(fast=True, clabel='Tidal current [m/s]', skip=1, scale=20,
            background=[ 'sea_ice_x_velocity', 'sea_ice_y_velocity'])
gallery/animations/example_cmems_0.gif

Total running time of the script: ( 0 minutes 0.000 seconds)

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