def _field_name_grib1_to_grib2(field_name_grib1):
    """Converts field name from grib1 to grib2.

    :param field_name_grib1: Field name in grib1 format.
    :return: field_name_grib2: Field name in grib2 format.
    """

    return field_name_grib1.replace('gnd', 'ground').replace('sfc', 'surface')