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WIGOS Metadata Standard: Semantic standard and code tables
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Total carbon variables for codetable 1-01-01.csv #168

Closed richard-olav closed 2 years ago

richard-olav commented 4 years ago

Branch

https://github.com/wmo-im/wmds/blob/Issue168/tables_en/1-01-01.csv

Summary and Purpose

Add descriptions to existing variables for total and elemental carbon.

Stakeholder(s)

WG ACV

Proposal

notation name (old) name (new) description (new)
623 Elemental carbon (coarse), PM10 Elemental carbon, PM10 Carbonaceous fraction of particulate matter that is thermally stable in an inert atmosphere to high temperatures near 4000K and can only be gasified by oxidation starting at temperatures above 340 degC. It is assumed to be inert and nonvolatile under atmospheric conditions and insoluble in any solvent. Size range: PM10
624 Elemental carbon, PM1 Elemental carbon, PM1 Carbonaceous fraction of particulate matter that is thermally stable in an inert atmosphere to high temperatures near 4000K and can only be gasified by oxidation starting at temperatures above 340 degC. It is assumed to be inert and nonvolatile under atmospheric conditions and insoluble in any solvent. Size range: PM1
625 Elemental carbon, PM2.5 Elemental carbon, PM2.5 Carbonaceous fraction of particulate matter that is thermally stable in an inert atmosphere to high temperatures near 4000K and can only be gasified by oxidation starting at temperatures above 340 degC. It is assumed to be inert and nonvolatile under atmospheric conditions and insoluble in any solvent. Size range: PM2.5
626 Total carbon (coarse), PM10 Total carbon, PM10 Sum of elemental and organic carbon. Includes inorganic carbon, which is operationally distributed between elemental and organic carbon. Size range: PM10

Reason

Addition of missing descriptions

original comment I am not able to find the representations for the variables below in the codetable 1-01-01.csv Observed variable - measurand (atmosphere):

ebas_varibale_name, cf_name,matrix total_carbon,mass_concentration_of_total_carbon_in_pm10_minus_pm1_in_air,pm10_pm1 total_carbon,mass_concentration_of_total_carbon_in_pm10_minus_pm2p5_in_air,pm10_pm25 total_carbon,mass_concentration_of_total_carbon_in_pm2p5_in_air,pm25 total_carbon_corrected,mass_concentration_of_total_carbon_corrected_in_pm2p5_in_air,pm25 total_carbon,mass_concentration_of_total_carbon_in_dry_aerosol_particles_in _air,aerosol

Could they be added?

IgorZahumensky commented 4 years ago

@joergklausen can it be closed as no issue here?

joergklausen commented 3 years ago

Franziska: needs a Proposal and Reason, and branch with new entries along the lines of what we already have. It is clear that we will review the structure of the table more holistically, but adding new variables is more achievable right now.

fstuerzl commented 3 years ago

Summary and Purpose Addition of variables for total carbon in code table 1-01-01 (Observed variable - atmosphere)

Proposal Include the following variables in code table 1-01-01.csv Label Description Path
Total carbon, PM10-PM1, in air Mass concentration of total carbon in PM10-PM1 in air \Atmosphere\Aerosol\Composition\Inorganic carbonaceous\Total carbon, PM10-PM1, in air
Total carbon, PM10-PM2.5, in air Mass concentration of total carbon in PM10-PM2.5 in air \Atmosphere\Aerosol\Composition\Inorganic carbonaceous\Total carbon, PM10-PM2.5, in air
Total carbon, PM2.5, in air Mass concentration of total carbon in PM 2.5 in air \Atmosphere\Aerosol\Composition\Inorganic carbonaceous\Total carbon, PM2.5, in air
Total carbon, corrected, PM2.5, in air Mass concentration of total carbon corrected in PM2.5 in air \Atmosphere\Aerosol\Composition\Inorganic carbonaceous\Total carbon, corrected, PM2.5, in air
Total carbon, dry aerosol, in air Mass concentration of total carbon in dry aerosol particles in air \Atmosphere\Aerosol\Composition\Inorganic carbonaceous\Total carbon, dry aerosol, in air

Reason Missing entries in variable list, required by @richard-olav

gaochen-larc commented 3 years ago

should total carbon be organic carbonaceous or this is measurement specific?

richard-olav commented 3 years ago

I am not sure if this question was directed to me. But total carbon for us is related to the total of both elemental carbon and organic carbon. I believe that the "path" is misleading if "Total carbon" is specified under inorganic carbon since it usually refers to both inorganic and organic carbon.

joergklausen commented 3 years ago

What does 'corrected' mean? I agree the path as proposed by @fstuerzl needs to be re-visited, and I am looking at the SAG Aerosol (@markusfiebig) to propose an improved structure for the aerosol branch of the tree. Is it agreed that Total carbon = Inorganic carbonaceous + Organic carbonaceous + Black carbon ?

markusfiebig commented 3 years ago

A few comments:

  1. Total carbon is neither inorganic nor organic, thus needs to be placed at the hierarchy level above.
  2. Black carbon is a qualitative term, it can't be measured, only its properties can be measured.
  3. Total carbon = Inorganic carbon + Organic carbon would be true. In the respective community, they use "elemental carbon" instead of "inorganic carbon".
  4. On the aerosol branch: I wrote before that the term "aerosol" is used wrongly in this hierarchy. In the hierarchy, it is referred to the aerosol particles. An aerosol denotes the whole system of particles AND the carrier gas. In the hierarchy, we should use "particle phase".
  5. The variables describing the particle phase composition should be organised in an unambiguous way, which is notoriously difficult for chemical species. One of the few examples would be the IUPAC system. However, as we see with the example of "total carbon", observed properties are sometimes impossible to place in the IUPAC structure. One solution could be to have no further structure below the "composition" level. The part of the hierarchy below "Atmosphere\Particle phase\composition" seems to be overstructured.
markusfiebig commented 3 years ago

P.S.: The term "corrected" should probably go into a modifier in the WIGOS vocabulary, and it should state the type of correction more specifically.

markusfiebig commented 3 years ago

P.P.S.: One more comment concerning the structure of the "particle phase" branch. The structure distinguishes between "physical properties - primary" and "physical properties - secondary". If we distinguish that way, we would also need to do that for the optical properties, which is not the case today. However, I think we should drop that distinction alltogether. A property isn't per se primary or secondary. That depends on how the property was obtained. That type of information should not be part of the variable name, but stored in a modifier.

gaochen-larc commented 3 years ago

Based on "Recommendations for reporting “black carbon” measurements" by A Petzold et al.,

The recommended definition for "Total Carbon Mass" is "the mass of all carbonaceous matter in airborne particles". Traditional definition is "EC + OC", like mentioned by Markus.

Agree with Markus that BC is a qualitive variable, which represents a variety light-absorbing carbonaceous particulate (or particle) phase components.

"Total Carbon" should be under "Composition", not under inorganic or organic carbonaceous

fstuerzl commented 3 years ago

Updated proposal:

Label Description Path
Total carbon, PM10-PM1, in air Mass concentration of total carbon in PM10-PM1 in air \Atmosphere\Aerosol\Composition\Total carbon, PM10-PM1, in air
Total carbon, PM10-PM2.5, in air Mass concentration of total carbon in PM10-PM2.5 in air \Atmosphere\Aerosol\Composition\Total carbon, PM10-PM2.5, in air
Total carbon, PM2.5, in air Mass concentration of total carbon in PM 2.5 in air \Atmosphere\Aerosol\Composition\Total carbon, PM2.5, in air
Total carbon, corrected, PM2.5, in air Mass concentration of total carbon corrected in PM2.5 in air \Atmosphere\Aerosol\Composition\Total carbon, corrected, PM2.5, in air
Total carbon, dry aerosol, in air Mass concentration of total carbon in dry aerosol particles in air \Atmosphere\Aerosol\Composition\Total carbon, dry aerosol, in air

Other changes of the path structure, terms and modifiers depend on #173 and #181 and require further discussion.

fstuerzl commented 3 years ago

Branch: https://github.com/wmo-im/wmds/tree/Issue168 View differences: https://github.com/wmo-im/wmds/commit/24bb3ec74b311d06cb685c8dbd40d0093e371bd2#diff-160fbee712206a9a655a755c35b0b78b48ab1514bf8937984c6069c5fdf6ba6d Notation to be added.

fstuerzl commented 3 years ago

@richard-olav, @gaochen-larc, could you confirm the branch, please? @gaochen-larc, @markusfiebig, I think it makes sense to add the variables with the path "\Atmosphere\Aerosol\Composition\" for now, if this issue should be included in the next fast track. Renaming the category "Aerosol" to "Particle phase" as discussed in #181 will take more time (milestone FT-2021-2). Do you agree?

markusfiebig commented 3 years ago

@fstuerzl, I'm a little confused about the proposed names. Just before Christmas, we had a telecon where we found ways to store modifiers like PM1, PM10, etc. in WMDS elements outside the variable name to prevent the list of variables from blowing up. We also agreed that the way forward would be to store these modifiers not in the variable names, but other places in the metadata record. If we now define names that include modifiers, we are locked in, or we need to change them again very soon. I would propose to leave these out.

gaochen-larc commented 3 years ago

Another issue we need to discuss is particle sizing technique. The particle size is very much sizing technique dependent. The air quality standard of PM2.5 is defined as aerodynamic diameter <= 2.5 um. Depending on the density of the particles, the geometric size may be significant less than 2 um.

fstuerzl commented 3 years ago

@gaochen-larc, the particle size will be removed from the variable names and instead we would like to include the particle size as a sampling feature. I reopened the this issue, because the variable "total carbon" itself is still missing from the code list.

path label description
\Atmosphere\Aerosol\Composition\Total carbon Total carbon

Proposals for definition:

fstuerzl commented 3 years ago

@markusfiebig, please provide consolidated proposal for terms, paths and definitions to be included (total carbon, black carbon, ...) .

markusfiebig commented 3 years ago

Here are my 5 cents on these definitions:

notation name (new) description (new)
new (?) id elemental carbon mass concentration Carbonaceous fraction of particulate matter that is thermally stable in an inert atmosphere to high temperatures near 4000K and can only be gasified by oxidation starting at temperatures above 340 degC. It is assumed to be inert and nonvolatile under atmospheric conditions and insoluble in any solvent.
new (?) id organic carbon mass concentration Mass concentration of particulate carbon contained in any of the vast number of compounds where carbon is chemically combined with hydrogen and other elements like O, S, N, P, Cl, etc.
new (?) id total carbon mass concentration The sum of the mass concentrations of elemental and organic carbon. Includes inorganic carbon, which is operationally distributed between elemental and organic carbon.
new (?) id equivalent black carbon mass concentration Carbon mass concentration obtained by conversion from particle light absorption coefficient with a suitable mass absorption coefficient.

Didn't include a definition for black carbon since we are dealing with observed properties, and black carbon cannot be observed - only properties of black carbon can be observed.

joergklausen commented 3 years ago

@markusfiebig Shouldn't inorganic carbon be included as a part of 'total carbon'? Cyanide, (bi)carbonate, etc?

markusfiebig commented 3 years ago

@markusfiebig Shouldn't inorganic carbon be included as a part of 'total carbon'? Cyanide, (bi)carbonate, etc?

@joergklausen The method used to determine elemental and organic carbon distributes inorganic carbon between the first 2 classes. I updated the definition accordingly, also updated the definition of elemental carbon.

gaochen-larc commented 3 years ago

The updated definition looks good to me. Thanks!

joergklausen commented 3 years ago

Suggestion for slight re-phrasing of description, namely drop 'assumed to be': "[...] It is inert and nonvolatile under atmospheric conditions and insoluble in any solvent." Reason: In a definition, there shouldn't be assumptions.

markusfiebig commented 3 years ago

There's a reason why "assumed to be" is written there. The reference methods for measuring elemental carbon cannot assure that the assumption is met.

fstuerzl commented 3 years ago

Consolidated proposal (as discussed in WG ACV):

Branch

https://github.com/wmo-im/wmds/blob/Issue168/tables_en/1-01-01.csv

Summary and Purpose

Add descriptions to existing variables for total and elemental carbon.

Stakeholder(s)

WG ACV

Proposal

notation name (old) name (new) description (new)
623 Elemental carbon (coarse), PM10 Elemental carbon, coarse, PM10 Carbonaceous fraction of particulate matter that is thermally stable in an inert atmosphere to high temperatures near 4000K and can only be gasified by oxidation starting at temperatures above 340 degC. It is assumed to be inert and nonvolatile under atmospheric conditions and insoluble in any solvent. Size range: coarse, PM10
624 Elemental carbon, PM1 Elemental carbon, PM1 Carbonaceous fraction of particulate matter that is thermally stable in an inert atmosphere to high temperatures near 4000K and can only be gasified by oxidation starting at temperatures above 340 degC. It is assumed to be inert and nonvolatile under atmospheric conditions and insoluble in any solvent. Size range: PM1
625 Elemental carbon, PM2.5 Elemental carbon, PM2.5 Carbonaceous fraction of particulate matter that is thermally stable in an inert atmosphere to high temperatures near 4000K and can only be gasified by oxidation starting at temperatures above 340 degC. It is assumed to be inert and nonvolatile under atmospheric conditions and insoluble in any solvent. Size range: PM2.5
626 Total carbon (coarse), PM10 Total carbon, coarse, PM10 Sum of elemental and organic carbon. Includes inorganic carbon, which is operationally distributed between elemental and organic carbon. Size range: coarse, PM10

Reason

Addition of missing descriptions

markusfiebig commented 3 years ago

The expressions PM10 and coarse are partly contradicting. PM10 means coarse+fine+ultrafine. For the new names, we should only use PM10, and omit coarse.

charlesabrock commented 3 years ago

Agreed.

Chuck

On Jun 15, 2021, at 6:44 AM, markusfiebig @.***> wrote:

The expressions PM10 and coarse are partly contradicting. PM10 means coarse+fine+ultrafine. For the new names, we should only use PM10, and omit coarse.

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fstuerzl commented 3 years ago

Updates:

notation name (old) name (new) description (new)
623 Elemental carbon (coarse), PM10 Elemental carbon, PM10 Carbonaceous fraction of particulate matter that is thermally stable in an inert atmosphere to high temperatures near 4000K and can only be gasified by oxidation starting at temperatures above 340 degC. It is assumed to be inert and nonvolatile under atmospheric conditions and insoluble in any solvent. Size range: PM10
624 Elemental carbon, PM1 Elemental carbon, PM1 Carbonaceous fraction of particulate matter that is thermally stable in an inert atmosphere to high temperatures near 4000K and can only be gasified by oxidation starting at temperatures above 340 degC. It is assumed to be inert and nonvolatile under atmospheric conditions and insoluble in any solvent. Size range: PM1
625 Elemental carbon, PM2.5 Elemental carbon, PM2.5 Carbonaceous fraction of particulate matter that is thermally stable in an inert atmosphere to high temperatures near 4000K and can only be gasified by oxidation starting at temperatures above 340 degC. It is assumed to be inert and nonvolatile under atmospheric conditions and insoluble in any solvent. Size range: PM2.5
626 Total carbon (coarse), PM10 Total carbon, PM10 Sum of elemental and organic carbon. Includes inorganic carbon, which is operationally distributed between elemental and organic carbon. Size range: PM10