add a variable for Florida Strait transports, volume and heat (sftrans, sfhtrans)

[jmecki]

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[github-actions]

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.

[jmecki]

Sorry forgot to add CMIP7 to the title

[sol1105]

@jmecki In the following my attempt to assist in this proposal. I would suggest the following standard_names for the CMIP7 variables you proposed:

Volume Transport Through Florida Strait

standard_name: ocean_volume_transport_across_line (existing standard name)
canonical units: [m3 s-1]
description: Transport "across_line" means that which crosses a particular line on the Earth's surface; formally this means the integral along the line of the normal component of the transport.

This is an already existing standard_name and you could add the actual description of the line (in this case the Florida Strait) as a variable comment or - as it was done in CMIP6 - as entry along an additional region character dimension of the data array - that means that the final dataset would have the following dimensions: time region, with region meaning: oline/region (character, opening, passage, strait, channel, etc.).

For example, for CMIP6 we submitted the variable mfo (sea water transport across line) for the following regions (i.e. entries of the character dimension): barents_opening,bering_strait,canadian_archipelago,denmark_strait,drake_passage,english_channel,pacific_equatorial_undercurrent,faroe_scotland_channel,florida_bahamas_strait,fram_strait,iceland_faroe_channel,indonesian_throughflow,mozambique_channel,taiwan_luzon_straits,windward_passage

Heat Transport Through Florida Strait

standard_name: ocean_heat_transport_across_line
canonical units: [W]
description: Ocean heat transport" means total heat transport by the ocean by all processes. Transport "across_line" means that which crosses a particular line on the Earth's surface; formally this means the integral along the line of the normal component of the transport.

This would be a new standard_name. I constructed it by using bits from the following existing standard_names: northward_atmosphere_heat_transport, ocean_heat_x_transport, ocean_volume_transport_across_line

[jmecki]

Thank you that sounds good. Would it be possible to also include a freshwater or salt transport variable?

i.e. ocean_salt_transport_across_line or ocean_freshwater_transport_across_line

[sol1105]

@jmecki you would need to propose these variables for the CMIP7 data request, as you did with the previous ones (https://wcrp-cmip.org/cmip7/cmip7-data-request/public-consultation/). When proposing the new variables you would be referencing this issue thread as the CF standard name proposal. The standard_names you suggested look fine to me. A full description could look like this:

Ocean Salt Transport Across Line

standard_name: ocean_salt_transport_across_line
canonical units: [kg s-1]
description: "Ocean salt transport" refers to the mass of salt being transported by the ocean by all processes. Transport "across_line" means that which crosses a particular line on the Earth's surface; formally this means the integral along the line of the normal component of the transport.

Related standard_names: northward_ocean_salt_transport, ocean_salt_x_transport, ocean_volume_transport_across_line

Ocean Freshwater Transport Across Line

standard_name: ocean_freshwater_transport_across_line
canonical units: [kg s-1]
description: Ocean transport means transport by all processes, both sea water and sea ice. Transport "across_line" means that which crosses a particular line on the Earth's surface; formally this means the integral along the line of the normal component of the transport.

Related standard_names: northward_ocean_freshwater_transport, ocean_volume_transport_across_line

I think it would be good, if you updated your initial post in this issue thread with the four descriptions we came up with, since so far the post only shows a template.

[taylor13]

I would have been happier if the existing names for salt transport had somewhere included the word "mass", since several different quantities associated with a substance can be transported by it (mass, energy, momentum, volume, moles, ...). With river fluxes, we were clear with names like water_volume_transport_in_river_channel and carbon_mass_transport_in_river_channel, and I hope if it is requested, we would define water_mass_transport_in_river_channel, rather than water_transport_in_river_channel. I think this would avoid misinterpretation.

All this is to suggest replacing in #218 (comment) ocean_salt_transport_across_line with ocean_salt_mass_transport_across_line.

[As a footnote regarding the CMIP7 data request, it is good practice (and reduces the size of the data request) if we avoid defining variables that can be obtained through simple subtraction (or any other simple operation) from existing variables. Given that to excellent approximation the total mass transport is just the some of the freshwater transport and the ocean salt mass transport, request only 2 of these 3 variables.]

[github-actions]

This issue has had no activity in the last 30 days. Accordingly:

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• If the proposal seems to have come to a consensus, please
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Standard name moderators are also reminded to review @feggleton @japamment @efisher008

[efisher008]

Dear Jenny @jmecki,

Was there an outcome from this proposal in the CMIP7 data request? If you could provide an update on the status of the names suggested in this issue, that would be very appreciated.

Best regards,
Ellie