Here are proposed definitions provided by my colleague Ad Stoffelen at KNMI:
-------------------------------
divergence_of_surface_downward_stress
The divergence is a signed scalar that represents the magnitude of the 2D
surface wind downward stress vector field's source (positive) or sink
(negative) at a given point. The surface called "surface" means the lower
boundary of the atmosphere. "Downward" indicates a downward flux of
momentum, which accelerates the lower medium along the vector and the upper
medium against the vector. The surface downward stress is the wind stress
on the surface.
--------------------------------
curl_of_surface_downward_stress
The curl is a signed scalar that represents the magnitude of the 2D surface
wind downward stress vector field's local anti-clock-wise rotation at a
given point; clockwise rotation is thus given as negative curl. The surface
called "surface" means the lower boundary of the atmosphere. "Downward"
indicates a downward flux of momentum, which accelerates the lower medium
along the vector and the upper medium against the vector. The surface
downward stress is the wind stress on the surface.
Best regards,
Bruce
ps. We have just changed email systems and it was necessary for me to
reregister on the cf-metadata list in order to get my messages accepted. I
hope it works now. -B
----------------------------------------------------------------------
Message: 1
Date: Tue, 19 Jan 2016 16:41:17 +0000
From: Jonathan Gregory <j.m.gregory at reading.ac.uk>
To: cf-metadata at cgd.ucar.edu
Subject: [CF-metadata] standard_names for wind stress curl, wind
stress divergence
Message-ID: <20160119164117.GA23893 at met.reading.ac.uk>
Content-Type: text/plain; charset=us-ascii
Dear Bruce
> If there are indeed no standard_names that are appropriate, I would like
to suggest the following:
> divergence_of_surface_downward_stress
> curl_of_surface_downward_stress
I don't think we have named those before and your proposals look like the
natural choice to me. If you could provide definitions (like those most
quantities have in the table) and canonical units that will constitute a
proposal. People may then comment and when it seems that the discussion is
over, if they are agreed, they'll be added to the list.
Best wishes and thanks
Jonathan
--
------------------------------------------------------------------------
Bruce Hackett Senior Scientist
Norwegian Meteorological Institute (MET Norway), R & D Dept.
P.O. Box 43 - Blindern e-mail: Bruce.Hackett at met.no
N-0313 Oslo Phone: +47 48 048 958
NORWAY Fax: +47 22 96 33 80
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