Dear Maarten and Martin,
Many thanks for these proposals and apologies for not having responded sooner.
There seems to be full agreement that four of the names are a straight forward addition to the standard name table.
1. atmosphere_mole_content_of_methane (mol m-2)
' "Content" indicates a quantity per unit area. The "atmosphere content" of a quantity refers to the vertical integral from the surface to the top of the atmosphere. For the content between specified levels in the atmosphere, standard names including "content_of_atmosphere_layer" are used. The construction "atmosphere_mole_content_of_X" means the vertically integrated number of moles of X above a unit area. The chemical formula for methane is CH4. Methane is a member of the group of hydrocarbons known as alkanes. There are standard names for the alkane group as well as for some of the individual species.'
This name is accepted for inclusion in the standard name table and will be added in the May update.
2. atmosphere_mole_content_of_water_vapor (mol m-2)
' "Content" indicates a quantity per unit area. The "atmosphere content" of a quantity refers to the vertical integral from the surface to the top of the atmosphere. For the content between specified levels in the atmosphere, standard names including "content_of_atmosphere_layer" are used. The construction "atmosphere_mole_content_of_X" means the vertically integrated number of moles of X above a unit area. Atmosphere water vapor content is sometimes referred to as "precipitable water", although this term does not imply the water could all be precipitated. The chemical formula for water is H2O.'
This name is accepted for inclusion in the standard name table and will be added in the May update.
3. atmosphere_mole_content_of_carbon_monoxide (mol m-2)
' "Content" indicates a quantity per unit area. The "atmosphere content" of a quantity refers to the vertical integral from the surface to the top of the atmosphere. For the content between specified levels in the atmosphere, standard names including "content_of_atmosphere_layer" are used. The construction "atmosphere_mole_content_of_X" means the vertically integrated number of moles of X above a unit area. The chemical formula of carbon monoxide is CO.'
This name is accepted for inclusion in the standard name table and will be added in the May update.
4. atmosphere_mole_content_of_nitrogen_dioxide (mol m-2)
' "Content" indicates a quantity per unit area. The "atmosphere content" of a quantity refers to the vertical integral from the surface to the top of the atmosphere. For the content between specified levels in the atmosphere, standard names including "content_of_atmosphere_layer" are used. The construction "atmosphere_mole_content_of_X" means the vertically integrated number of moles of X above a unit area. The chemical formula for nitrogen dioxide is NO2.'
This name is accepted for inclusion in the standard name table and will be added in the May update.
5. atmosphere_mole_content_of_semiheavy_water_vapor / atmosphere_mole_content_of_water_vapor_containing_2H (mol m-2)
This name is still under discussion, pending the outcome of the PMIP proposals. I will be looking at those over the next few days.
While looking at these atmosphere_mole_content proposals I came across three closely related ones dating from 2015 listed in the standard names editor:
6. mole_content_of_methane_in_atmosphere_layer (mol m-2)
' "Content" indicates a quantity per unit area. The "content_of_X_in_atmosphere_layer" refers to the vertical integral between two specified levels in the atmosphere. "Layer" means any layer with upper and lower boundaries that have constant values in some vertical coordinate. There must be a vertical coordinate variable indicating the extent of the layer(s). If the layers are model layers, the vertical coordinate can be model_level_number, but it is recommended to specify a physical coordinate (in a scalar or auxiliary coordinate variable) as well. For the mole content integrated from the surface to the top of the atmosphere, standard names including "atmosphere_mole_content_of_X" are used. The chemical formula for ozone is CH4. Methane is a member of the group of hydrocarbons known as alkanes. There are standard names for the alkane group as well as for some of the individual species.'
7. mole_content_of_nitrogen_dioxide_in_atmosphere_layer (mol m-2)
' "Content" indicates a quantity per unit area. The "content_of_X_in_atmosphere_layer" refers to the vertical integral between two specified levels in the atmosphere. "Layer" means any layer with upper and lower boundaries that have constant values in some vertical coordinate. There must be a vertical coordinate variable indicating the extent of the layer(s). If the layers are model layers, the vertical coordinate can be model_level_number, but it is recommended to specify a physical coordinate (in a scalar or auxiliary coordinate variable) as well. For the mole content integrated from the surface to the top of the atmosphere, standard names including "atmosphere_mole_content_of_X" are used. The chemical formula for ozone is NO2.'
8. mole_content_of_carbon_monoxide_in_atmosphere_layer (mol m-2)
' "Content" indicates a quantity per unit area. The "content_of_X_in_atmosphere_layer" refers to the vertical integral between two specified levels in the atmosphere. "Layer" means any layer with upper and lower boundaries that have constant values in some vertical coordinate. There must be a vertical coordinate variable indicating the extent of the layer(s). If the layers are model layers, the vertical coordinate can be model_level_number, but it is recommended to specify a physical coordinate (in a scalar or auxiliary coordinate variable) as well. For the mole content integrated from the surface to the top of the atmosphere, standard names including "atmosphere_mole_content_of_X" are used. The chemical formula for ozone is CO.'
Again, all three of these are straight forward additions to the table. They don't seem to have received any comments on the mailing list but I can see no problems with them so these old proposals are also accepted and will be added in the May update.
Best wishes,
Alison
------
Alison Pamment Tel: +44 1235 778065
NCAS/Centre for Environmental Data Archival Email: alison.pamment at stfc.ac.uk
STFC Rutherford Appleton Laboratory
R25, 2.22
Harwell Oxford, Didcot, OX11 0QX, U.K.
-----Original Message-----
From: CF-metadata [mailto:cf-metadata-bounces at cgd.ucar.edu] On Behalf Of Maarten Sneep
Sent: 06 April 2018 15:15
To: Juckes, Martin (STFC,RAL,RALSP) <martin.juckes at stfc.ac.uk>; cf-metadata at cgd.ucar.edu
Subject: Re: [CF-metadata] Standard name proposal related to methane, water vapor, carbon monoxide, semi-heavy water, and nitrogen dioxide.
Dear Martin,
On 06/04/18 16:02, Martin Juckes - UKRI STFC wrote:
> the four names for methane, water vapor, carbon monoxide and nitrogen dioxide result from simple application of existing CF name patterns, so I support their adoption as you have proposed them.
>
>> * atmosphere_mole_content_of_methane
>> * atmosphere_mole_content_of_water_vapor
>> * atmosphere_mole_content_of_carbon_monoxide
>> * atmosphere_mole_content_of_nitrogen_dioxide
>
>
> For semiheavy-water, there is a related discussion about variable required for CMIP6 by PMIP:
>
> : http://mailman.cgd.ucar.edu/pipermail/cf-metadata/2018/059995.html
>
>
> For PMIP we need names referring to multiple isotopic variants of water vapor: H-2H-O, H2-O17, H2-O18. We have taken an approach which allows us to be precise in the name and deal with all these variants:
>
> e.g. precipitation_flux_containing_2H. This has not been accepted yet, but has some support. Would you be happy to use:
>
> atmosphere_mole_content_of_water_vapor_containing_2H
>
> with help text which makes it clear that this means a single "2H" atom per water molecule?
>
> e.g. "The expression A_containing_B refers to the amount of A which contains B. When B is an isotope, it refers to molecules of A which contain one atom of B, unless indicated otherwise by a number following B."
I'm happy to use anything that is clear and consistent with other names. I don't think isotopes have been used in names before, so we're on uncharted territory. I understand the need to be more accurate than what I have, although this notation required some getting used to. I assume that "containing_18O" is for H_2(18-O).
That modification is fine with me if the CMIP6 proposal gets through. If that proposal gets through with modifications, then I prefer to be consistent with those modifications as well.
Kind regards,
Maarten
> ________________________________
> From: CF-metadata <cf-metadata-bounces at cgd.ucar.edu> on behalf of
> Maarten Sneep <maarten.sneep at knmi.nl>
> Sent: 06 April 2018 13:00
> To: cf-metadata at cgd.ucar.edu
> Subject: Re: [CF-metadata] Standard name proposal related to methane, water vapor, carbon monoxide, semi-heavy water, and nitrogen dioxide.
>
> Hi,
>
> I haven't heard anything after sending this in. Can these names be
> considered for inclusion in the standard_name list?
>
> Kind regards,
>
> Maarten Sneep
>
> On 23/02/18 15:04, Maarten Sneep wrote:
>> Hi,
>>
>> I'd like to propose the following standard names:
>>
>> * atmosphere_mole_content_of_methane
>> * atmosphere_mole_content_of_water_vapor
>> * atmosphere_mole_content_of_carbon_monoxide
>> * atmosphere_mole_content_of_semiheavy_water_vapor
>> * atmosphere_mole_content_of_nitrogen_dioxide
>>
>> Details are provided below.
>>
>> atmosphere_mole_content_of_methane
>> Canonical units: mol/m2
>> Description: "Content" indicates a quantity per unit area. The "atmosphere content"
>> of a quantity refers to the vertical integral from the surface to the
>> top of the atmosphere. For the content between specified levels in
>> the atmosphere, standard names including
>> "content_of_atmosphere_layer" are used. The construction
>> "atmosphere_mole_content_of_X" means the vertically integrated number
>> of moles of X above a unit area. The chemical formula for methane is
>> CH4. Methane is a member of the group of hydrocarbons known as alkanes. There are standard names for the alkane group as well as for some of the individual species.
>>
>> (References: atmosphere_mass_content_of_methane,
>> atmosphere_mole_content_of_ozone; for ozone both mole content and mass content exist).
>>
>>
>> atmosphere_column_average_mole_fraction_of_methane_in_dry_air
>> Canonical units: 1
>>
>>
>> atmosphere_mole_content_of_water_vapor
>> Canonical units: mol/m2
>> Description: "Content" indicates a quantity per unit area. The "atmosphere content"
>> of a quantity refers to the vertical integral from the surface to the
>> top of the atmosphere. For the content between specified levels in
>> the atmosphere, standard names including
>> "content_of_atmosphere_layer" are used. The construction
>> "atmosphere_mole_content_of_X" means the vertically integrated number
>> of moles of X above a unit area. The chemical formula for water is
>> H2O. Atmosphere water vapor content is sometimes referred to as "precipitable water", although this term does not imply the water could all be precipitated.
>>
>> (References: atmosphere_mass_content_of_water_vapor,
>> atmosphere_mole_content_of_ozone; for ozone both mole content and mass content exist).
>>
>>
>> atmosphere_mole_content_of_carbon_monoxide
>> Canonical units: mol/m2
>> Description: "Content" indicates a quantity per unit area. The "atmosphere content"
>> of a quantity refers to the vertical integral from the surface to the
>> top of the atmosphere. For the content between specified levels in
>> the atmosphere, standard names including
>> "content_of_atmosphere_layer" are used. The construction
>> "atmosphere_mole_content_of_X" means the vertically integrated number of moles of X above a unit area. The chemical formula for carbon monoxide is CO.
>>
>> (References: atmosphere_mass_content_of_carbon_monoxide,
>> atmosphere_mole_content_of_ozone; for ozone both mole content and mass content exist).
>>
>>
>> atmosphere_mole_content_of_semiheavy_water_vapor
>> Canonical units: mol/m2
>> Description: "Content" indicates a quantity per unit area. The "atmosphere content"
>> of a quantity refers to the vertical integral from the surface to the
>> top of the atmosphere. For the content between specified levels in
>> the atmosphere, standard names including
>> "content_of_atmosphere_layer" are used. The construction
>> "atmosphere_mole_content_of_X" means the vertically integrated number
>> of moles of X above a unit area. The chemical formula for semi-heavy water is HDO, water with one hydrogen replaced by deuterium.
>>
>> Note: This one is tricky, HDO is not D2O, so the correct term is not heavy water.
>> Open for suggestions here.
>>
>>
>> atmosphere_mole_content_of_nitrogen_dioxide
>> Canonical units: mol/m2
>> Description: "Content" indicates a quantity per unit area. The "atmosphere content"
>> of a quantity refers to the vertical integral from the surface to the
>> top of the atmosphere. For the content between specified levels in
>> the atmosphere, standard names including
>> "content_of_atmosphere_layer" are used. The construction
>> "atmosphere_mole_content_of_X" means the vertically integrated number of moles of X above a unit area. The chemical formula for nitrogen_dioxide is NO2.
>>
>> (References: troposphere_mole_content_of_nitrogen_dioxide,
>> stratosphere_mole_content_of_nitrogen_dioxide).
>
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>
Maarten Sneep
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Received on Thu Apr 19 2018 - 12:34:40 BST
