# data[].attributes.definition
A velocity is a vector quantity. "Upward" indicates a vector component which is positive when directed upward (negative downward). Upward air velocity is the vertical component of the 3D air velocity vector.

# data[].attributes.note
I am aware that 'vertical velocity' is already in the vocabulary, but for consistency , we would prefer if these 3 wind components (northward wind, eastward wind and upward air velocity) from the sonic anemometer come all from sf-conventions

# data[].attributes.definition
The brightness temperature of a body is the temperature of a black body which radiates the same power per unit solid angle per unit area.

# data[].attributes.definition
Area fraction" is the fraction of a grid cell's horizontal area that has some characteristic of interest. It is evaluated as the area of interest divided by the grid cell area, or if the cell_methods restricts the evaluation to some portion of that grid cell (e.g. "where sea_ice"), then it is the area of interest divided by the area of the identified portion. It may be expressed as a fraction, a percentage, or any other dimensionless representation of a fraction. The cloud area fraction is for the whole atmosphere column, as seen from the surface or the top of the atmosphere. For the cloud area fraction between specified levels in the atmosphere, standard names including "cloud_area_fraction_in_atmosphere_layer" are used. Standard names also exist for high, medium and low cloud types. Cloud area fraction is also called "cloud amount" and "cloud cover.

# data[].attributes.definition
Cloud_base refers to the base of the lowest cloud. Altitude is the (geometric) height above the geoid, which is the reference geopotential surface. The geoid is similar to mean sea level.

# data[].attributes.definition
"Number concentration" means the number of particles or other specified objects per unit volume. "Aerosol" means the system of suspended liquid or solid particles in air (except cloud droplets) and their carrier gas, the air itself.

# data[].attributes.definition
'atmosphere_mass_content_of_water_vapor', 
alias: atmosphere_water_vapor_content

Content" indicates a quantity per unit area. The "atmosphere content" of a quantity refers to the vertical integral from the surface to the top of the atmosphere. For the content between specified levels in the atmosphere, standard names including content_of_atmosphere_layer are used. Atmosphere water vapor content is sometimes referred to as "precipitable water", although this term does not imply the water could all be precipitated.

# data[].attributes.note
for convenience I suggest to name the term 'water vapor content, atmosphere' and add the cfconventions' term

# data[].attributes.definition
"Eastward" indicates a vector component which is positive when directed eastward (negative westward). Wind is defined as a two-dimensional (horizontal) air velocity vector, with no vertical component.

# data[].attributes.definition
"Northward" indicates a vector component which is positive when directed northward (negative southward). Wind is defined as a two-dimensional (horizontal) air velocity vector, with no vertical component.