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Tags for observed variables
Five domains are defined in the context of the WIGOS Metadata Standard. Observed variables are distributed over five tables according to these domains in the codes registry, but the entries have unique ids (=notations) across all tables.
An observed variable is thus defined as: Observed variable = Domain x Matrix (optional) x Species/State variable (with a unique id/notation), where the domain is implicit in the name of the code table. A chemical species or state variable can appear multiple times in these code tables in case it defined for more than one domain or matrix. NB: In a future revision, the approach of breaking up the code table 1-01 into five separate tables 1-01-x may be revisited.
A matrix is the medium to which the observation or measurement refers to. The same chemical species contained in different matrices are listed in the code tables as different observed variables with individual ids. To avoid ambiguity, the label (= name) and description of an observed variable should contain information on the matrix.
Tags are categories that group variables on domain or matrix level. They provide ancillary information and replace the currently (2021) existing path structure, whereby a variable is connected to a domain through a unique path. Tags prevent ambiguities in the categorization but still allow applications to represent all variables in a hierarchical structure to facilitate search and navigation. To describe hierarchies, tags can be nested.
In addition, some variables are listed in the code table with specific size information or information on the relative humidity at the time of sampling. This information is important to interpret observations, however, it will no longer be included in the name of an observed variable. Size information will be specified using a new code list (see ref issue). Other specific conditions of the observation will be specified elsewhere (discussion and modeling still ongoing).
| notation | name | description | tags | |
|---|---|---|---|---|
| State variable | [id] | [variable name (quantity)] | [definition] | [tag1, tag2,...] |
| Chemical composition or other property | [id] | [molecular formula (names)] [in] [matrix] | IUPAC: [...], PubChem CID: [...], CAS Number: [...] | [tag1, tag2,...] |
Variable: Direct solar radiation
- current path structure
notation path 572 \Atmosphere\Radiation\Solar\Direct solar radiation - new approach with tags:
domain: atmosphere (implicit), matrix: n/a, tag: Radiation {Solar}
notation name description tags 572 Direct solar radiation Radiation {Solar}
Variable: Cl-
-
variables currently in the code list:
notation path 614 \Atmosphere\Aerosol\Composition\Inorganic anions\Chloride (Cl-), PM1 615 \Atmosphere\Aerosol\Composition\Inorganic anions\Chloride (Cl-), PM10 616 \Atmosphere\Aerosol\Composition\Inorganic anions\Chloride (Cl-), PM2.5 617 \Atmosphere\Aerosol\Composition\Inorganic anions\Chloride (Cl-), total aerosol 539 \Atmosphere\Total Atmospheric Deposition\Inorganic anions\Chloride (Cl-) -
new approach
- domain: atmosphere, matrix: Particle phase, tags: Inorganic, Anion
- domain: atmosphere, matrix: Total deposition, tags: Inorganic, Anion
notation name description tags new id Cl- (chloride) in particle phase IUPAC: chloride, PubChem CID: 312, CAS Number: 16887-00-6 Inorganic, Anion 539 Cl- (chloride) in total deposition IUPAC: chloride, PubChem CID: 312, CAS Number: 16887-00-6 Inorganic, Anion
Variable: CH4
-
variables, which is currently in the code list:
notation path 192 \Atmosphere\Gas\Greenhouse Gas\CH4 -
new approach
- domain: atmosphere, matrix: Gas phase, tags: Greenhouse gas, Reactive gas, VOC, Alkane
notation name description tags 192 CH4 (methane) in gas phase IUPAC: methane, PubChem CID: 297, CAS Number: 74-82-8 Greenhouse gas, Reactive gas, VOC, Alkane NB: The tag "Reactive gas" is not confirmed.
The following table lists tags independent from domains or matrices, to which they are related. It provides definitions and - if a tag is part of a logical structure - specifies another tags, that represent a broader concept. E. g. the tag "pinaceae" refers to a specific family of pollen and thus is part of the broader term "pollen".
DRAFT
| Tag | Definition | Dependencies (for nested tags) |
|---|---|---|
| chemical composition | ||
| inorganic species | Chemical compound that typically lacks C-H bonds | |
| organic species | Chemical compound that typically contains C-H bonds | |
| anion | Negatively charged chemical species | |
| cation | Positively charged chemical species | |
| trace element | ||
| N species | Chemical compound containing nitrogen | |
| S species | Chemical compound containing sulphur | |
| P species | Chemical compound containing phosphorous | |
| H species | Chemical compound containing hydrogen | |
| O species | Chemical compound containing oxygen | |
| C species | Chemical compound containing carbon | |
| Cl species | Chemical compound containing chlorine | |
| carbonaceous material | ||
| acid | Chemical compound that can donate a proton or accept an electron pair | |
| alkane | Acyclic saturated hydrocarbon (hydrocarbon, in which all carbon - carbon bonds are single) | |
| alkene | Hydrocarbon containing one or more double bonds | |
| alkyne | Unsaturated hydrocarbon containing at least one carbon—carbon triple bond | |
| aromatic | Organic compound with cyclic, planar structure with pi-bonds in resonance | |
| aldehyde | Organic compound that has a -CHO functional group | |
| ketone | Organic compound that has a -C-(C=O)-C- functional group | |
| ether | Organic compound that has a -C-O-C- functional group | |
| ester | Organic compound that has a -C(O)-O-C- functional group | |
| alcohol | Organic compound that has a -C-OH functional group | |
| terpene | Organic compounds with the formula (C5H8)n | |
| nitrate | ||
| nitrile/cyano | Organic compound that has a -C≡N functional group | |
| isotopologue | Chemical compound with a specific isotopic signature | |
| greenhouse gas | Gases that absorb and emit infrared radiation in the wavelength range emitted by Earth | |
| CFC | Chlorinated fluorinated compound | |
| HCFC | Hydro chlorinated fluorinated compound | |
| HFC | Hydro fluorinated compound | |
| PFC | Perfluorinated compound | |
| halon | Organohalogen compounds containing bromine and fluorine and one or two carbons | |
| halocarbon | Halogenated compound | |
| VOC | Volatile organic compound | |
| OVOC | Oxygenated volatile organic compound | |
| BVOC | Biological volatile organic compound | |
| POP | Persistent organic pollutant | |
| PAH | Polyaromatic hydrocarbon | |
| mixed stereoisomer | ||
| specified stereoisomer | ||
| physical property | ||
| optical property | ||
| dynamics | ||
| humidity | ||
| lightning | ||
| precipitation | ||
| pressure | ||
| radiation | ||
| IR | radiation | |
| solar | radiation | |
| UV | radiation | |
| radionuclide | ||
| temperature | ||
| visibility | ||
| obscurations | visibility | |
| wind | ||
| clouds | Condensed water in the atmosphere | |
| cloud ice | ||
| position | ||
| type | ||
| bioaerosol | Particles of biological origin | |
| fungi | ||
| capnodiales | Order of capnodiales fungi | fungi |
| pleosporales | Order of pleosporales fungi | fungi |
| pollen | ||
| adoxaceae | Adoxaceae family pollen | pollen |
| altingiaceae | Altingiaceae family pollen | pollen |
| amaranthaceae | Amaranthaceae family pollen | pollen |
| aquifoliaceae | Aquifoliaceae family | pollen |
| arecaceae | Arecaceae family pollen | pollen |
| betulaceae | Betulaceae family pollen | pollen |
| brassicaceae | Brassicaceae family pollen | pollen |
| buxaceae | Buxaceae family pollen | pollen |
| cannabaceae | Cannabaceae family pollen | pollen |
| caryophyllaceae | Caryophyllaceae family pollen | pollen |
| cupressaceae | Cupressaceae family pollen | pollen |
| cyperaceae | Cyperaceae family pollen | pollen |
| elaeagnaceae | Elaeagnaceae family pollen | pollen |
| ericaceae | Ericaceae family pollen | pollen |
| euphorbiaceae | Euphorbiaceae family pollen | pollen |
| fagaceae | Fagaceae family pollen | pollen |
| ginkgoaceae | Ginkgoaceae family pollen | pollen |
| juglandaceae | Juglandaceae family pollen | pollen |
| juncaceae | Juncaceae family pollen | pollen |
| malvaceae | Malvaceae family pollen | pollen |
| moraceae | Moraceae family pollen | pollen |
| oleaceae | Oleaceae family pollen | pollen |
| pinaceae | Pinaceae family pollen | pollen |
| plantaginaceae | Plantaginaceae family pollen | pollen |
| platanaceae | Platanaceae family pollen | pollen |
| poaceae | Poaceae family pollen | pollen |
| polygonaceae | Polygonaceae family pollen | pollen |
| ranunculaceae | Ranunculaceae family pollen | pollen |
| rosaceae | Rosaceae family pollen | pollen |
| salicaceae | Salicaceae family pollen | pollen |
| sapindaceae | Sapindaceae family pollen | pollen |
| taxaceae | Taxaceae family pollen | pollen |
| ulmaceae | Ulmaceae family pollen | pollen |
| umbelliferae | Umbelliferae family pollen | pollen |
| urticaceae | Urticaceae family pollen | pollen |
| biology | ||
| biogeochemistry | ||
| nutrients | ||
| plankton | ||
| topography | ||
| dissolved material | ||
| sea surface height | ||
| sea state | ||
| ocean surface stress | ||
| sea ice | ||
| CTD |
OUTDATED
To group variables for which the concept of 'matrix' is not defined, tags can be defined on the domain level as 'classifiers'. Issue #277 1-06-01 New code list "Domain" contains a proposal to add the domains used in the WIGOS Metadata Standard in Category 1: Observed variable as a separate code table.
Q: Should a tag be assigned if it is part of the variable name?
The following table lists the tags on the domain level, together with the domains for which these tags are relevant.
| Tag | Definition | Atmosphere | Earth | Ocean | Outer Space | Terrestrial | Status |
|---|---|---|---|---|---|---|---|
| Bioaerosols | particles of biological origin | x | uncontroversial | ||||
| Clouds | condensed water in the atmosphere | x | uncontroversial | ||||
| Humidity | x | ?needed? | |||||
| Lightning | x | uncontroversial | |||||
| Precipitation | x | uncontroversial | |||||
| Pressure | x | uncontroversial | |||||
| Radiation | x | x | uncontroversial | ||||
| Radionuclide | x | domain or matrix level? | |||||
| Temperature | x | uncontroversial | |||||
| Visibility | x | uncontroversial | |||||
| Wind | x | x | uncontroversial | ||||
| Physical property | x | domain or matrix level? | |||||
| Biogeochemical property | x | uncontroversial | |||||
| Biological property | x | domain or matrix level? | |||||
| Cryosphere | x | x | uncontroversial | ||||
| Currents | x | uncontroversial | |||||
| Topography | x | uncontroversial | |||||
| Transmissivity | x | ?needed? | |||||
| Waves | x | uncontroversial | |||||
| Ground water | x | uncontroversial | |||||
| Lake | x | uncontroversial | |||||
| River | x | uncontroversial | |||||
| Land surface | x | uncontroversial | |||||
| Soil | x | uncontroversial | |||||
| Ice sheet | x | x | uncontroversial |
Tags with sub-tags:
- Bioaerosols: {Pollen: {...}, Fungi}
- Clouds: {Position, Ice, Liquid water, Type, Optical properties}
- Lightning: {Position}
- Radiation: {Solar, IR, UV}
- Visibility: {Obscurations}
These tags are intended for use for variables where the concept of matrix is defined, but they are not restricted to the context of matrix. See Issue #278 1-06-02 New code list "Matrix".
| Tag | Definition | Gas phase | Particle phase | Aerosol | Dry deposition | Wet deposition | Total deposition | Status |
|---|---|---|---|---|---|---|---|---|
| Greenhouse Gas | x | uncontroversial | ||||||
| Reactive Gas | x | ?useful? | ||||||
| VOC | x | uncontroversial | ||||||
| POP | persistent organic pollutant | x | x | x | x | x | x | uncontroversial |
| PAH | polyaromatic hydrocarbon | x | x | x | x | x | x | uncontroversial |
| Alkane | x | uncontroversial | ||||||
| Alkene | x | uncontroversial | ||||||
| Alkyne | x | uncontroversial | ||||||
| Inorganic species | Chemical compound that typically lacks C-H bonds | x | x | x | x | x | x | uncontroversial |
| Organic species | Chemical compound that typically contains C-H bonds | x | x | x | x | x | x | uncontroversial |
| Major inorganic components | x | x | x | x | x | ?needed | ||
| Anion | Negatively charged chemical species | x | x | x | x | x | uncontroversial | |
| Cation | Positively charged chemical species | x | x | x | x | x | uncontroversial | |
| Trace element | x | x | x | x | x | uncontroversial | ||
| N species | Chemical compound containing nitrogen | x | x | x | x | x | x | uncontroversial |
| P species | Chemical compound containing phosphorous | x | x | x | x | x | x | uncontroversial |
| S species | Chemical compound containing sulphur | x | x | x | x | x | x | uncontroversial |
| Acid | Chemical compound that can donate a proton or accept an electron pair | x | x | x | x | x | x | uncontroversial |
| CFC | Chlorinated fluorinated compound | x | uncontroversial | |||||
| HCFC | Hydro chlorinated fluorinated compound | x | uncontroversial | |||||
| HFC | Hydro fluorinated compound | x | uncontroversial | |||||
| PFC | Perfluorinated compound | x | uncontroversial | |||||
| Halocarbon | Halogenated compound | x | uncontroversial | |||||
| Halon | Organohalogen compounds containing bromine and fluorine and one or two carbons | x | uncontroversial | |||||
| Aromatic | Organic compound with cyclic, planar structure with pi-bonds in resonance | x | x | x | x | x | x | uncontroversial |
| Aldehyde | Organic compound that has a -CHO functional group | x | x | x | x | x | x | uncontroversial |
| Ketone | Organic compound that has a -C-(C=O)-C- functional group | x | x | x | x | x | x | uncontroversial |
| Ether | Organic compound that has a -C-O-C- functional group | x | x | x | x | x | x | uncontroversial |
| Ester | Organic compound that has a -C(O)-O-C- functional group | x | x | x | x | x | x | uncontroversial |
| Alcohol | Organic compound that has a -C-OH functional group | x | x | x | x | x | x | uncontroversial |
| Terpene | Organic compounds with the formula (C5H8)n | x | x | x | x | x | x | uncontroversial |
| OVOC | Oxygenated volatile organic compound | x | uncontroversial | |||||
| BVOC | Biological volatile organic compound | x | uncontroversial | |||||
| Nitrile/cyano | Organic compound that has a -C≡N functional group | x | x | x | x | x | x | uncontroversial |
| C species | Chemical compound containing carbon | x | x | x | x | x | x | useful/needed? |
| H species | Chemical compound containing hydrogen | x | x | x | x | x | x | useful/needed? |
| O species | Chemical compound containing oxygen | x | x | x | x | x | x | useful/needed? |
| Physical property | x | x | x | useful/needed? | ||||
| Optical property | x | x | x | useful/needed? | ||||
| Composition | x | x | x | x | x | x | useful/needed? | |
| Carbonaceous material | x | x | x | x | x | x | useful/needed? | |
| Isotopologue | Chemical compound with a specific isotopic signature | x | x | x | x | x | x | uncontroversial |