[CF-metadata] surface_air_pressure vs air_pressure_at_sea_level

Hi all - I have a question about the use of the terms 'sea_level' and 'surface' in the following definitions: air_pressure_at_sea_level: sea_level means mean sea level, which is close to the geoid in sea areas. Air pressure at sea level is the quantity often abbreviated as MSLP or PMSL.

[CF-metadata] Example 5.10. British National Grid has wrong parameter names

Example 5.10. British National Grid int crs ; crs:grid_mapping_name = transverse_mercator; crs:semi_major_axis = 6377563.396 ; crs:semi_minor_axis = 6356256.910 ; crs:inverse_flattening = 299.3249646 ; crs:latitude_of_projection_origin = 49.0 ;