Hi,
I have the following 5 new standard_name values for you to consider. I'm sure that
the unfinished business of 'albedo' will come back to bite me here.
Best,
Maarten
Name: uv_aerosol_index
Description: UV means ultraviolet radiation. The UV-Aerosol Index is a UV colour
index that represents the deviation of the outgoing TOA radiation in the UV from that
of a standard atmosphere, featuring Rayleigh scattering and gas absorption, in
particular by ozone. No cloud droplets or suspended liquid or solid particles
(aerosols) are present in the standard atmosphere. It is bounded below by a
Lambertian surface, featuring isotropic reflection, assumed independent of
wavelength. The UV-AI is computed from the Earth reflectances at two UV wavelengths.
A positive deviation from the standard atmosphere is often, but not exclusively,
attributed to the absorption of radiation by aerosols, while negative values
represent increased scattering, not necessarily by aerosols.
Name: cloud_optical_centroid_pressure
Description: The cloud optical centriod pressure is a pressure level inside the
cloud, near the optical thickness center of the cloud.
Name: cloud_area_fraction_assuming_fixed_cloud_albedo
Description: "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'.
Name: cloud_albedo_assuming_cloud_area_fraction_of_1
Description: cloud_albedo_assuming_cloud_area_fraction_of_1 means a derived
(retrieved) cloud albedo in an area assuming cloud area fraction is 1 in this area
(the grid cell or satellite footprint). 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.
Name: cloud_optical_centroid_pressure_assuming_cloud_area_fraction_of_1
The cloud optical centriod pressure is a pressure level inside the cloud, near the
optical thickness center of the cloud.
Cloud_optical_centroid_pressure_assuming_cloud_area_fraction_of_1 means a cloud
optical centriod pressure assuming the cloud area fraction is 1 for this area (the
grid cell or satellite footprint). 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.
--
KNMI
T: 030 2206747
E: maarten.sneep at knmi.nl
R: A2.14
Received on Tue Sep 29 2015 - 07:57:54 BST
