effective_cloud_area_fraction_assuming_fixed_cloud_albedo under discussion
Created: April 19, 2016
Proposer: Maarten Sneep
Proposed Date: 2016-03-10
Change Date: April 19, 2016, 3:23 p.m.
Unit ref: UUUU
"X_area_fraction" means the fraction of horizontal area occupied by X. "X_area"
means the horizontal area occupied by X within the grid cell or the satellite
footprint. Cloud area fraction is also called "cloud amount" and "cloud cover". The
cloud area fraction is for the whole atmosphere column, as seen from the surface or
the top of the atmosphere. Cloud area fraction assuming fixed cloud albedo is the
cloud area fraction by assuming the clouds in the X_area having the same fixed cloud
albedo value (Y). The clouds having cloud_area_fraction_assuming_fixed_cloud_albedo
and cloud albedo Y yield the same reflectance at TOA as the real clouds in the
X_area. A phrase assuming_condition indicates that the named quantity is the value
which would obtain if all aspects of the system were unaltered except for the
assumption of the circumstances specified by the condition. The assumed albedo shall
be attached to the variable either by an attribute 'assumed_cloud_albedo' (if the
value is independent of geolocation) or through the ancillary_variables to a variable
with standard_name 'cloud_albedo'.