def get_no_strat_levels(no_vert_levels_atmos):
    """
        Returns the number of stratospheric levels based on the number of vertical
        levels in the model which is returned from the parse_jason function

        :param no_vert_levels_atmos: [str] returned from the parse_jason function
        :return: [str] no_strat_levels
        """
    try:
        if float(no_vert_levels_atmos) > 60:
            no_strat_levels = '20'
        else:
            no_strat_levels = '10'
    except:
        no_strat_levels = '10'

    return no_strat_levels