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[CF-metadata] Proposed new standard name: effective_radius_of_cloud_particle_at_cloud_top

From: Jonathan Wrotny <jwrotny>
Date: Sun, 15 Dec 2013 16:55:58 -0500

Dear CF board,

Back in May, a colleague of mine, Randy Horne, submitted a new proposed
name for the effective radius of a cloud particle at the top of a
cloud. Our proposed standard name was
"effective_radius_of_cloud_particle_at_cloud_top". We did not hear back
from any CF posters at the time in regards to this proposal, and are
hoping to re-start this proposal now.

The motivation for this new standard name is a data product on the
future GOES-R geostationary platform. This product is the effective
radius for a cloud particle at the top of a cloud. The GOES-R product
will not distinguish between water and ice particles, however.
Currently, the CF database has a similar standard name but for liquid
particles only
(effective_radius_of_cloud_liquid_water_particle_at_liquid_water_cloud_top).
This standard name does not suffice for the GOES-R data product, hence,
the proposal for a slightly more general standard name which would cover
both water and ice particles at the cloud top. Here is our current
proposal:

Standard Name:

effective_radius_of_cloud_particle_at_cloud_top

Definition:

The effective radius of a size distribution of particles, such as
aerosols, cloud droplets or ice crystals, is the area weighted mean
radius of particle size. It is calculated as the ratio of the third to
the second moment of the particle size distribution. cloud_top refers to
the top of the highest cloud and cloud_particle refers to either a
liquid water droplet or ice crystal.

Canonical Units:

m

Thanks for your consideration of this proposal. All comments are welcome.

Sincerely,

Jonathan Wrotny
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