Dear Martin and all,
Thanks a lot Martin for your contributions.
Please find below my answers/comments and my updated proposals.I tried
to find an appropriate answer to each comment and issue,
excepted for "pm10", "black carbon" and "aerosol" definitions, which
will be further discussed in aforthcoming email (also in reply to Markus).
In my first submission, I had not provided the definition of the
names/terms, which are /already part of the CF metada convention/.
Some are now/provided below /to better answer to your comments.
With my best regards,
Brigitte
-------- Original Message --------
Subject: AW: HTAP2 Final proposal = 102 CF Standard Names
Date: Thu, 23 Jan 2014 03:05:28 +0000
From: Schultz, Martin <m.schultz at fz-juelich.de>
To: Brigitte Koffi Lefeivre <Brigitte.Koffi-Lefeivre at jrc.ec.europa.eu>,
"cf-metadata at cgd.ucar.edu" <cf-metadata at cgd.ucar.edu>
CC: Alison.Pamment at stfc.ac.uk <Alison.Pamment at stfc.ac.uk>, frank
dentener <frank.dentener at jrc.ec.europa.eu>, Michael Schulz
<michael.schulz at met.no>, Keating, Terry <Keating.Terry at epa.gov>,
markus.fiebig at nilu.no <markus.fiebig at nilu.no>
Dear Brigitte and all,
please find below a few comments -- I only copied those names on which I made a comment.
Thanks again for this effort!
Martin
> -----Urspr?ngliche Nachricht-----
> Von: Brigitte Koffi Lefeivre [mailto:Brigitte.Koffi-Lefeivre at jrc.ec.europa.eu]
> Gesendet: Dienstag, 21. Januar 2014 09:20
> 1. EMISSIONS
> Proposed new standard name:
> tendency_of_atmosphere_mass_content_of_pm10_dry_aerosol_due_to_emission
> Unit: kg m-2 s-1
There is an issue with "PM10 emissions" in that this term is somewhat ambiguous and obviously a diagnostic, because models will generally emit BC, OC, SO4, etc. rather than PM10.
I would argue that this standard_name is nevertheless useful, but the definition should make this diagnostic aspect clear.
Yes, models emit different types and sizes of particles. Pm10 is a AQ standard diagnostic related to the size.
Note that "pm10" and "dry" and "aerosol" CF standard names already exist and are defined as follows:
//"Aerosol" means the suspended liquid or solid particles in air (except cloud droplets)."/
/"Pm10 aerosol" is an air pollutant with an aerodynamic diameter of less than or equal to 10 micrometers."/
/
"///Aerosol takes up ambient water (a process known as hygroscopic growth) depending on the relative humidity and the composition of the aerosol.
"Dry aerosol" means aerosol without water."/
This specific issueof "pm10"will be further discussed- together with "aerosol" and "black carbon" definitions - in a forthcoming email to Markus Fiebig.
> Proposed new standard name:
> tendency_of_atmosphere_mass_content_of_pm2p5_dry_aerosol_due_to_emission
> Unit: kg m-2 s-1
Same as above
Same as above
> Proposed new standard name:
> tendency_of_atmosphere_mass_content_of_pm10_seasalt_dry_aerosol_due_to_emission
> Unit: kg m-2 s-1
Same as above
Same as above
> Proposed new standard name:
> tendency_of_atmosphere_mass_content_of_pm10_dust_dry_aerosol_due_to_emission
> Unit: kg m-2 s-1
Same as above
Same as above
> Proposed new standard name:
> tendency_of_atmosphere_mass_content_of_pm2p5_seasalt_dry_aerosol_due_to_emission
> Unit: kg m-2 s-1
Same as above
Same as above
> Proposed new standard name:
> tendency_of_atmosphere_mass_content_of_pm2p5_dust_dry_aerosol_due_to_emission
> Unit: kg m-2 s-1
Same as above
Same as above
> Proposed new standard name:
> tendency_of_atmosphere_mass_content_of_nmvoc_expressed_as_carbon_due_to_emission
> Unit: kg m-2 s-1
The definition string should contain a clear recommendation to add a comment attribute that details which VOC are contained in "nmvoc" for this model
Such a recommendation does not exist in the current "nmvoc" CF definition (e.g. for atmosphere_moles_of_biogenic_nmvoc_expressed_as_carbon <javascript:void(0)>):
/
"nmvoc" means non methane volatile organic compounds./
In HTAP2 we ask the modellers to provide this information in a model's description document instead.
> Proposed new standard name:
> tendency_of_atmosphere_mass_content_of_alkanes_due_to_emission
> Unit: kg m-2 s-1
The definition string should contain a clear recommendation to add a comment attribute that details which VOC are contained in "alkanes" for this model
I only provided new definitions that are not already part of the CF metadata convention.
Because the "alkanes" definition and your recommendation are already there, I did not provide it.
/"Alkanes contain only hydrogen and carbon combined in the general proportions C(n)H(2n+2); "alkanes" is the term used in standard names to describe the group of chemical species having this common structure that are represented within a given model. The list of individual species that are included in a quantity having a group chemical standard name can vary between models. Where possible, the data variable should be accompanied by a complete description of the species represent
ed, for example, by using a comment attribute. Standard names exist for some individual alkane species, e.g., methane and ethane."/
Note : We do provide the modellers with additional HTAP2 specific comments in the output description file (and HTAP2 CMOR Table, in preparation),
e.g. on species that are not included (because they have to be provided as individual species).
> Proposed new standard name:
> tendency_of_atmosphere_mass_content_of_alkenes_due_to_emission
> Unit: kg m-2 s-1
The definition string should contain a clear recommendation to add a comment attribute that details which VOC are contained in "alkenes" for this model
Same as above
> Proposed new standard name:
> tendency_of_atmosphere_mass_content_of_aromatic_compounds_due_to_emission
> Unit: kg m-2 s-1
The definition string should contain a clear recommendation to add a comment attribute that details which VOC are contained in "aromatic_compounds" for this model. Maybe it would be better to say "aromatic_voc" (if oxygenated compounds can be included) or "aromatic_hydrocarbon" (if you consider only C-H molecules)
Same as above."aromatic compound" refers to the existing CF definition hereafter:
/"Aromatic compounds in organic chemistry are compounds that contain at least one benzene ring of six carbon atoms joined by alternating single and double covalent bonds. The simplest aromatic compound is benzene itself. In standard names "aromatic_compounds" is the term used to describe the group of aromatic chemical species that are represented within a given model. The list of individual species that are included in a quantity having a group chemical standard name can vary bet
ween models. Where possible, the data variable should be accompanied by a complete description of the species represented, for example, by using a comment attribute. Standard names exist for some individual aromatic species, e.g. benzene and xylene/"
> Proposed new standard name:
> tendency_of_atmosphere_mass_content_of_biogenic_nmvoc_expressed_as_carbon_due_to_emission
> Unit: kg m-2 s-1
The definition string should contain a clear recommendation to add a comment attribute that details which VOC are contained in "biogenic_voc" for this model
Such recommendation does not exist in current CF "nmvoc" and "Biogenic" definitions (see for instanceatmosphere_moles_of_biogenic_nmvoc_expressed_as_carbon <javascript:void(0)>):
//""/nmvoc" means non methane volatile organic compounds".
""Biogenic" means influenced, caused, or created by natural processes".//
/
> Proposed new standard name:
> tendency_of_atmosphere_mass_content_of_secondary_particulate_organic_matter_dry_aerosol_due_to_pseudo_emission.
> Unit: kg m-2 s-1
> Definition: pseudo_emission means that the model does not calculate the
> particulate organic matter formed within the atmosphere from gaseous
> precursors but uses a pseudo emission instead.
Hmmm. Does it really make sense to come up with a new term "pseudo_emission" here? I guess for the model (i.e. mathematically) this is an emission.
In the physical world this doesn't happen, but is this pertinent here?
I would suggest to rename to "..._due_to_emission" and state in the definition that secondary organic aerosol are (of course) not directly emitted,
but that emissions can be defined as a model concept.
I agree.
_Updated proposal_
Proposed new standard name:tendency_of_atmosphere_mass_content_of_secondary_particulate_organic_matter_dry_aerosol_due_to_emission.
Unit: kg m-2 s-1
Definition:/ //"Secondary particulate organic matter " means particulate organic matter formed within the atmosphere from gaseous precursors./
"Emission" of secondary compounds indicates thattheirformation is not calculated by the model but through the use of an emission term".
> Proposed new standard name:
> tendency_of_atmosphere_mass_content_of_monoterpenes_due_to_emission
> Unit: kg m-2 s-1
> Definition: Monoterpenes are a class of terpenes that consist of two
> isoprene units and have the molecular formula C10H16.
The definition should at least recommend to include a comment attribute detailing which monoterpenes are considered in the model
I agree. Provided below (adapted from "terpenes"/existing definition/):
_Updated proposal
_Definition/:/"//
////Monoterpenes are a class of terpenes that consist of two isoprene units and have the molecular formula C10H16.The term "monoterpenes" is used in standard names to describe the group of chemical species having this common structure that are represented within a given model. The list of individual species that are included in a quantity having a group chemi
cal standard name can vary between models. Where possible, the data variable should be accompanied by a complete description of the species represented, for example, by using a comment attribute/"/
> Proposed new standard name:
> tendency_of_atmosphere_mass_content_of_sesquiterpenes_due_to_emission
> Unit: kg m-2 s-1
> Definition: Sesquiterpenes are a class of terpenes that consist of three
> isoprene units and have the molecular formula C15H24.
The definition should recommend to include a comment attribute detailing which sesquiterpenes are considered in the model
Same as above
_Updated proposal
_Definition/:/"// ////Sesquiterpenes are a class of terpenes////that consist of three isoprene units and have the molecular formula C15H24.The term "sesquiterpenes" is used in standard names to describe the group of chemical species having this common structure that are represented within a given model. The list of individual species that are included in a quantity having a group chemical standard name can vary between models. Where possible, the data variable should be accompanied by a complete description of the species represented, for example, by using a comment attribute/"/
> 2. DEPOSITIONS
> Proposed new standard name:
> tendency_of_atmosphere_mass_content_of_organic_nitrates_due_to_dry_deposition
> Unit: kg m-2 s-1
> Definition: organic nitrates are nitrogen-containing compounds, general
> formula RONO2, where R is an alkyl (or organic) group.
The definition should recommend to include a comment attribute detailing which organic nitrates are considered in the model
_Updated proposal
_Definition/:/"////Organic nitrates are nitrogen-containing compounds, general formula RONO2, where R is an alkyl (or organic) group.////// The term "organic nitrates" is used in standard names to describe the group of chemical species having this common structure that are represented within a given model. The list of individual species that are included in a quantity having a group chemical standard name can vary between models. Where possible, the data variable should be accompanied by a complete description of the species represented, for example, by using a comment attribute/"///
//
> 3. MASS MIXING RATIO
no comments
> 4. MOLE MIXING RATIO
> Proposed new standard name: mole_fraction_of_alkenes_in_air
> Unit: mol mol-1
The definition should recommend to include a comment attribute detailing which alkenes are considered in the model
Because the "alkenes" definition and your recommendation already exist (see below) I did not provide it.
/
"Alkenes contain only hydrogen and carbon combined in the general proportions C(n)H(2n); "alkenes" is the term used in standard names to describe the group of chemical species having this common structure that are represented within a given model. The list of individual species that are included in a quantity having a group chemical standard name can vary between models. Where possible, the data variable should be accompanied by a complete description of the species represent
ed, for example, by using a comment attribute. Standard names exist for some individual alkene species, e.g., ethene and propene."/
//
> Proposed new standard name:
> mole_fraction_of_carbon_monoxide_with_lifetime_of_25_days_in_air
> Unit: mol mol-1
> Definition: idealized CO-like tracer with 25-days lifetime
I believe that this goes too far for CF. I would advocate to use a more general term for this kind of tracer and demand the use of the comment attribute plus a new "tracer_lifetime" attribute.
Example:
mole_fraction_of_synthetic_tracer_with_fixed_lifetime_in_air
tracer_lifetime : "25 days"
comment : "CO-like tracer with simple exponential decay loss term and a lifetime of 25 days."
So you propose to create something totally new, which sounds good to me.
I let it as suggested:
_
Updated proposal
_Proposed new standard name: mole_fraction_of_synthetic_tracer_with_fixed_lifetime_in_air
Proposed new attribute:tracer_lifetime : "25 days"
Comment : "CO-like tracer with simple exponential decay loss term and a lifetime of 25 days."
> Proposed new standard name:
> mole_fraction_of_carbon_monoxide_with_lifetime_of_50_days_in_air
> Unit: mol mol-1
> Definition: idealized CO-like tracer with 50-days lifetimes
Same as above
Same as above
_Updated proposal
_Proposed new standard name: mole_fraction_of_synthetic_tracer_with_fixed_lifetime_in_air
Proposed new attribute:tracer_lifetime : "50 days"
Comment : "CO-like tracer with simple exponential decay loss term and a lifetime of 50 days."
> 5. OTHER GASEOUS AND AEROSOL VARIABLES.
> Proposed new standard name:
> photolysis_rate_of_ozone_to_1D_oxygen_atom
> Unit: s-1
> Definition: "photolysis" is a chemical reaction in which a chemical compound
> is broken down by photons. "1D oxygen atom" means the 1D excited state of
> the oxygen atom.
The definition shouldn't use the jargon "1D" but state the singlett D state of...
ok.
_Updated proposal
_Proposed new standard name: photolysis_rate_of_ozone_to_1D_oxygen_atom
Unit: s-1
Definition: "photolysis" is a chemical reaction in which a chemical compound is broken down by photons. "1D oxygen atom" means the singlet D state of the oxygen atom.
> Proposed new standard name:
> tendency_of_atmosphere_mole_concentration_of_methane_due_to_chemical_destruction
> Unit: mole m-3 s-1
> Definition: "chemical destruction" means the result of all chemical reactions
> within the atmosphere that destroy a particular species.
Suggested rephrase of the definition: "chemical destruction" means the result of all chemical reactions
within the medium (here: atmosphere) that remove a certain amount of a particular species from the medium.
ok.
_
Updated proposal
_Proposed new standard name: tendency_of_atmosphere_mole_concentration_of_methane_due_to_chemical_destruction
Unit: mole m-3 s-1
Definition: "chemical destruction" means the result of all chemical reactions within the medium (here: atmosphere) that remove a certain amount of a particular species from the medium.
> Proposed new standard name:
> tendency_of_atmosphere_of_mole_concentration_of_carbon_monoxide_due_to_chemical_destruction
> Unit: mole m-3 s-1
> Definition: "chemical destruction" means the result of all chemical reactions
> within the atmosphere that destroy a particular species.
Same as above
_Updated proposal_
Proposed new standard name:tendency_of_atmosphere_of_mole_concentration_of_carbon_monoxide_due_to_chemical_destruction
Unit: mole m-3 s-1
Definition: "chemical destruction" means the result of all chemical reactions within the medium (here: atmosphere) that remove a certain amount of a particular species from the medium.
> Proposed new standard name:
> tendency_of_atmosphere_mole_concentration_of_ozone_due_to_chemical_destruction
> Unit: mole m-3 s-1
> Definition: "chemical destruction" means the result of all chemical reactions
> within the atmosphere that destroy a particular species.
Same as above
_Updated proposal_
Proposed new standard name: tendency_of_atmosphere_mole_concentration_of_ozone_due_to_chemical_destruction
Unit: mole m-3 s-1
Definition: "chemical destruction" means the result of all chemical reactions within the medium (here: atmosphere) that remove a certain amount of a particular species from the medium.
> Proposed new standard name:
> tendency_of_atmosphere_mole_concentration_of_ozone_due_to_chemical_production
> Unit: mole m-3 s-1
Suggested definition: "chemical production" means the result of all chemical reactions
within the medium (here: atmosphere) that lead to formation of a particular species in the medium.
ok.
_Updated proposal
_Proposed new standard name: tendency_of_atmosphere_mole_concentration_of_ozone_due_to_chemical_production
Unit: mole m-3 s-1
Definition: "chemical production" means the result of all chemical reactions within the medium (here: atmosphere) that lead to formation of a particular species in the medium.
> Proposed new standard name: rate_of_hydroxyl_radical_destruction_due_to_reaction_with_nmvoc
> Unit: s-1
> Definition: The (reaction) rate is the rate at which the reactants of a chemical
> reaction form the products. The "hydroxyl radical destruction due to reaction
> with nmvoc" is the NMVOC reactivity with regard to reactions with OH. It is
> the sum of the reactivity of all individual NMVOC species with OH.
Small change in definition: "... weighted sum of the reactivity..."
ok.
_Updated proposal_
Proposed new standard name: rate_of_hydroxyl_radical_destruction_due_to_reaction_with_nmvoc
Unit: s-1
Definition: The (reaction) rate is the rate at which the reactants of a chemical reaction form the products. The "hydroxyl radical destruction due to reaction
with nmvoc" is the NMVOC reactivity with regard to reactions with OH. It is the weighted sum of the reactivity of all individual NMVOC species with OH.
> Proposed new standard name:
> surface_net_downward_mass_flux_of_ammonia
> Unit: kg m-2 s-1
> Definition: "Downward" indicates a vector component which is positive when directed downward. Surface_net_downward_mass_flux_of_ammonia is
> equal to the difference between the quantities with standard names "surface_downward_mass_flux_of_ammonia" and "surface_upward_mass_flux_of_ammonia".
I think in this definition we should refer to the processes that drive the upward and downward fluxes.
For example by adding "Downward mass fluxes occur due to wet and dry deposition, upward mass fluxes are primarily due to emission."
_
_Here we refer to models with bidirectional surface exchanges of ammonia between the atmosphere and biosphere.
In this case, "surface_net_downward_mass_flux_of_ammonia" is simulated instead of "dry deposition"._
_I tried to make it clearer in the updatedname and definitionproposals:
_Updated proposal_
Proposed new standard name:surface_net_downward_mass_flux_of_ammonia_due_to_bidirectional_surface_exchange
Unit: kg m-2 s-1
Definition:"Bidirectional surface exchange" is the exchange of a particular species between the atmosphere and biosphere as simulated by bidirectional surface flux models.
"Downward" indicates a vector component which is positive when directed downward. Surface_net_downward_mass_flux_of_ammonia is
equal to the difference between the quantities with standard names "surface_downward_mass_flux_of_ammonia" and "surface_upward_mass_flux_of_ammonia".
> Proposed new standard name: surface_downward_mass_flux_of_ammonia
> Unit: kg m-2 s-1
As above
See above./"surface_downward_mass_flux_of_"/ already exists.
> Proposed new standard name: surface_upward_mass_flux_of_ammonia
> Unit: kg m-2 s-1
As above
See above./"surface_//up//ward_mass_flux_of_"/ already exists.
Best regards,
Martin
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