This is a comment on proposal 1 by Beate Geyer and Ronny Petrik on 20 August
for a new standard name
surface_normalized_direct_downwelling_shortwave_flux_in_air. My response was
delayed by trouble posting due to my changed email address.
In the solar energy community, this quantity, as described by Beate and Ronny,
is almost universally referred to as "direct normal irradiance". Here "normal"
means measured on a plane perpendicular (that is, normal) to the incoming solar
beam. I note that the World Meteorological Organisation follows a different
convention, naming the quantity measured on a normal plane "direct irradiance"
and that measured on a horizontal plane "direct horizontal irradiance", but
that convention is not followed in the renewable energy sector. Thus I suggest
that the proposed name should be changed to
surface_direct_normal_downwelling_shortwave_flux_in_air to better align with
solar energy practice. However, there might be CF rules/conventions/precedents
I am unaware of that make the normalized_direct form preferable.
Regards,
Ian Grant
Ian Grant | Research Scientist
Science To Services Program | Satellite Applications Team
Bureau of Meteorology
GPO Box 1289, Melbourne VIC 3001, AUSTRALIA
Level 9, 700 Collins Street, Docklands VIC 3008, AUSTRALIA
Tel: +61 3 9669 4080 | ian.gr...@bom.gov.au
www.bom.gov.au
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Today's Topics:
1. New standard names for norm. direct radiation and atm. mass
content of rain and snow + comments on existing descriptions
(beate.ge...@hzg.de)
2. Re: New standard_name of quality_flag for corresponding
quality control variables (Kehoe, Kenneth E.)
----------------------------------------------------------------------
Message: 1
Date: Tue, 20 Aug 2019 09:08:59 +0200
From: beate.ge...@hzg.de
To: cf-metadata@cgd.ucar.edu
Subject: [CF-metadata] New standard names for norm. direct radiation
and atm. mass content of rain and snow + comments on existing
descriptions
Message-ID:
<OF5D396235.9078C54C-ONC125845C.002501BE-C125845C.00274681@LocalDomain>
Content-Type: text/plain; charset="utf-8"
Dear CF-metadata group,
we have several proposals, which we send as a numbered list. Thanks for your
help beforehands!!
1.
Basing on surface_direct_downwelling_shortwave_flux_in_air we want to apply for
the new standard name
surface_normalized_direct_downwelling_shortwave_flux_in_air for use in
renewable energy tasks.
It is the surface_direct_downwelling_shortwave_flux_in_air on a plane, oriented
perpendicular to the incoming beam.
New name: surface_normalized_direct_downwelling_shortwave_flux_in_air
Description: The surface called "surface" means the lower boundary of the
atmosphere. ?Normalized_direct" radiation is radiation that has followed a
direct path from the sun to a plane perpendicular to the direction of the sun
(in contrast to the ?direct? radiation, which falls on a plane horizontal at
the earth surface). Downwelling radiation is radiation from above. It does not
mean "net downward". The sign convention is that "upwelling" is positive
upwards and "downwelling" is positive downwards.
The term "shortwave" means shortwave radiation. In accordance with common usage
in geophysical disciplines, "flux" implies per unit area, called "flux density"
in physics.
Unit: W m-2
<snip>
Best regards,
Beate Geyer and Ronny Petrik
Helmholtz-Zentrum Geesthacht
Zentrum f?r Material- und K?stenforschung GmbH Max-Planck-Stra?e 1 I 21502
Geesthacht I Deutschland/Germany
Gesch?ftsf?hrung/Board of Management: Prof. Dr. Wolfgang Kaysser, Silke Simon
Vorsitzender des Aufsichtsrates/Chairman of the Supervisory Board:
Ministerialdirigent Dr. Herbert Zeisel Amtsgericht L?beck HRB 285 GE (Register
Court)
Internet: http://www.hzg.de
<snip>
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