.. _zonal_mean:

Zonal Mean
^^^^^^^^^^

Plot the zonal mean of the 750 nm aerosol extinction in October 2011.

.. code-block:: python

    import os
    import xarray as xr
    import numpy as np

    # load all of the version 7 data and set time as the dimension
    v7_folder = r'path\to\v7_data'
    data = xr.open_mfdataset(os.path.join(v7_folder, '*.nc'))
    data = data.swap_dims({'profile_id': 'time'})

    lat_res = 5
    lat_bins = np.arange(-90, 91, lat_res)
    groups = data.extinction.sel(time='2011-10') \
                 .groupby_bins(data.latitude.sel(time='2011-10'),
                               bins=lat_bins, labels=lat_bins[1:] - lat_res / 2)

    groups.mean(dim='time').plot(x='latitude_bins', figsize=[7, 4])

.. image:: ../images/ex_zonal_mean.png
   :align: center