Add missing surface radiative flux diagnostic following on from #299

[fmoconnor]

This issue follows on from issue cf-convention/vocabularies#158, in which a range of standard names were proposed for inclusion in the CF convention for diagnostics from a diagnostic call to a model's radiation scheme, using a reference ozone field.

The original proposer, Fiona O'Connor, has since realised that one name was missing from the original request and would like to propose it here for completeness. The corresponding 3d radiative flux diagnostic was included, and this new proposal refers to just the surface level from that 3d flux.

The proposed new addition has the following name: Surface_upwelling_longwave_flux_in_air_assuming_clear_sky_and_reference_mole_fraction_of_ozone_in_air

Units: W/m2

The surface called "surface" means the lower boundary of the atmosphere. The term "longwave" means longwave radiation. Upwelling radiation is radiation from below. It does not mean "net upward". The sign convention is that "upwelling" is positive upwards and "downwelling" is positive downwards. When thought of as being incident on a surface, a radiative flux is sometimes called "irradiance". In addition, it is identical with the quantity measured by a cosine-collector light-meter and sometimes called "vector irradiance". In accordance with common usage in geophysical disciplines, "flux" implies per unit area, called "flux density" in physics. 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. "Clear sky" means in the absence of clouds. The 3D ozone field acts as a reference ozone field in a diagnostic call to the model's radiation scheme. It is expressed in terms of mole fraction of ozone in air. It may be observation-based or model-derived. It may be from any time period. By using the same ozone reference in the diagnostic radiation call in two model simulations and calculating differences between the radiative flux diagnostics from the prognostic call to the radiation scheme and the diagnostic call to the radiation scheme with the ozone reference, an instantaneous radiative forcing for ozone can be calculated.

[github-actions[bot]]

Thank you for your proposal. These terms will be added to the cfeditor (http://cfeditor.ceda.ac.uk/proposals/1) shortly. Your proposal will then be reviewed and commented on by the community and Standard Names moderator.

[JonathanGregory]

That makes sense. Thanks, Fiona @fmoconnor!

[efisher008]

Hi Fiona,

Thank you for your proposal. As this follows the format of the names and descriptions in your previous proposal, has Jonathan's approval, and was proposed over 7 days ago with no further comments, this name has been accepted and will be published in the next release of the standard names table (v86), which is planned for this summer.

Best regards, Ellie

[fmoconnor]

[like] Fiona O'Connor reacted to your message:

---

From: Ellie Fisher @.> Sent: Monday, July 15, 2024 2:43:10 PM To: cf-convention/discuss @.> Cc: Fiona O'Connor @.>; Mention @.> Subject: Re: [cf-convention/discuss] Add missing surface radiative flux diagnostic following on from cf-convention/vocabularies#158 (Issue cf-convention/vocabularies#58)

This email was received from an external source. Always check sender details, links & attachments.

Hi Fiona,

Thank you for your proposal. As this follows the format of the names and descriptions in your previous proposal, has Jonathan's approval, and was proposed over 7 days ago with no further comments, this name has been accepted and will be published in the next release of the standard names table (v86), which is planned for this summer.

Best regards, Ellie

— Reply to this email directly, view it on GitHubhttps://github.com/cf-convention/vocabularies/issues/58, or unsubscribehttps://github.com/notifications/unsubscribe-auth/AMIIFLVWNCE47OJWW7Q5YVDZMPNX5AVCNFSM6AAAAABKJKWJDKVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDEMRYGY3TGMBZHE. You are receiving this because you were mentioned.Message ID: @.***>

[efisher008]

This has been published in v86 of the Standard Names Table (released 5 September 2024).

[taylor13]

Sorry to reopen this, but I think some clarification is needed.

I'm pretty sure the surface emitted longwave radiation is independent of the anything except the surface properties (primarily emissivity and temperature). As such, why does it need a standard name that mentions atmospheric conditions? If one were to measure it, how does surface_upwelling_longwave_flux_in_air_assuming_clear_sky_and_reference_mole_fraction_of_ozone_in_air differ from surface_upwelling_longwave_flux_in_air

Most standard names that include "surface" are interpreted as meaning "at the surface". Are the surface longwave variables interpreted differently.

(We may also need to reevaluate what "clouds" have to do with the surface upwelling flux of longwave.

[japamment]

Hi Fiona @fmoconnor

Please could you respond to the question from @taylor13 in his post of October 14th. Although the name proposed in this issue has already been published in V86 of the standard name table, it may be necessary to revisit it and modify if needed.

Best wishes, Alison