[CF-metadata] New standard names for atmospheric particulate sea salt and corrections

Daniel Neumann daniel.neumann at io-warnemuende.de
Thu Mar 16 06:06:23 MDT 2017


Dear CF-Meta Mailinglist,

I would like to propose new sea salt related standard names (section C) 
and modifications/corrections of variable names and descriptions 
(sections A and B) of existing sea salt standard names. I have 
propositions for further nitrogen-related standard names, which I will 
send in a second e-mail to divide both proposition.


~~ Section A ~~~~~~~~~~~~~~~~~
I would like to propose to modify the following two standard names:
  1) from  mass_fraction_of_pm10_sea_salt_dry_aerosol_particles_in_air
       to  mass_fraction_of_pm10_seasalt_dry_aerosol_particles_in_air
  2) from  mass_fraction_of_pm2p5_sea_salt_dry_aerosol_particles_in_air
       to  mass_fraction_of_pm2p5_seasalt_dry_aerosol_particles_in_air

Reason: All other existing standard names dealing with sea salt write it 
as "seasalt" but not as "sea_salt". To be consistent we should rename 
these two standard names.


~~ Section B ~~~~~~~~~~~~~~~~~
Additionally, I would like to propose to replace the last scentence of 
the descriptions of these two standard names:
  1) from: "Pm10 aerosol" is an air pollutant with an aerodynamic 
diameter of less than or equal to 10 micrometers.
       to: "Pm10 aerosol" denotes atmospheric particulate compounds with 
an aerodynamic diameter of less than or equal to 10 micrometers.
  2) from: "Pm2p5 aerosol" is an air pollutant with an aerodynamic 
diameter of less than or equal to 2.5 micrometers.
       to: "Pm2p5 aerosol" denotes atmospheric particulate compounds with 
an aerodynamic diameter of less than or equal to 2.5 micrometers.

Reason: The default description for atmospheric particluate compounds is 
written for particles considered as pollutants (Sulfate, Nitrate, ...). 
Sea salt particles are not considered as air pollutants.


~~ Section C ~~~~~~~~~~~~~~~~~
Finally, I would like to propose the following new standard names (the 
descriptions and units follow in the end):
  1) mass_concentration_of_pm10_seasalt_dry_aerosol_particles_in_air
  2) 
mass_concentration_of_pm2p5_seasalt_cation_dry_aerosol_particles_in_air
  3) mass_concentration_of_seasalt_cation_dry_aerosol_particles_in_air
  4) mass_fraction_of_pm10_seasalt_cation_dry_aerosol_particles_in_air
  5) mass_fraction_of_pm2p5_seasalt_cation_dry_aerosol_particles_in_air
  6) atmosphere_mass_content_of_seasalt_cation_dry_aerosol_particles
  7) mass_fraction_of_seasalt_cation_dry_aerosol_particles_in_air
  8) 
mass_concentration_of_pm10_seasalt_cation_dry_aerosol_particles_in_air
  9) 
mass_concentration_of_pm2p5_seasalt_cation_dry_aerosol_particles_in_air
10) mass_concentration_of_chloride_dry_aerosol_particles_in_air
11) mass_fraction_of_chloride_dry_aerosol_particles_in_air
12) mole_concentration_of_chloride_in_air

Reason for (1) and (2): These standard names exist already as 
"mass_fraction" but not as "mass_concentration". However, the total mass 
(which we need to calculate the mass fraction) is not always known. 
Therefore, the mass_fraction might not be applicable in some situations.

Reason for (3) to (9): The mass of "seasalt_dry_aerosol_particles" is 
ambiguous. Providing the mass of "seasalt_cation_dry_aerosol_particles" 
is less ambiguous. At the time of emission, sea salt particles consist 
of Chloride, Sulfate, Sodium, and further cations with mass fractions 
each below 4%. When the sea salt ages and acids as nitric and sulfuric 
acid condense/form on the wet sea salt particles, chloride exporates as 
HCl (hydrochloric acid). Thus, the mass of the original sea salt ions 
decreases during aging. In the past, some chemistry transport models 
considered sea salt particles as one bulk species, which is no affected 
by this chloride displacement. Maybe some models still consider it as 
one. When sea salt is measured, commonly sodium and sometimes magnesium 
are considered as sea salt tracers, from which the original sea salt 
concentration is calculated. The same states for several modern 
chemistry transport models with speciated sea salt. Because atmospheric 
sea salt concentrations are commonly calculated on the base of cations 
(mainly sodium) and because these concentrations do not decrease, it 
might be better provide sea salt cation data instead of total sea salt 
data. It should be noted in a comment which species (which cations) are 
included and which mass ratios they have (see my suggestion for the 
description).

Reasons for (10) to (12): Currently, standard names only exist for some 
[cation]-chloride ion-compounds but not for chloride individually. When 
considering aged sea salt it might be intesting to have the chloride 
concentrations available.


Regards,
Daniel


Full standard name definitions (also attached in tab-separated file 
new_names_seasalt.csv):

mass_concentration_of_pm10_seasalt_dry_aerosol_particles_in_air
kg m-3
Mass concentration means mass per unit volume and is used in the 
construction mass_concentration_of_X_in_Y, where X is a material 
constituent of Y. A chemical species denoted by X may be described by a 
single term such as "nitrogen" or a phrase such as 
"nox_expressed_as_nitrogen". "Aerosol" means the system of suspended 
liquid or solid particles in air (except cloud droplets) and their 
carrier gas, the air itself. Aerosol particles take up ambient water (a 
process known as hygroscopic growth) depending on the relative humidity 
and the composition of the particles. "Dry aerosol particles" means 
aerosol particles without any water uptake. "Pm10 aerosol" denotes 
atmospheric particulate compounds with an aerodynamic diameter of less 
than or equal to 10 micrometers.

mass_concentration_of_pm2p5_seasalt_dry_aerosol_particles_in_air
kg m-3
Mass concentration means mass per unit volume and is used in the 
construction mass_concentration_of_X_in_Y, where X is a material 
constituent of Y. A chemical species denoted by X may be described by a 
single term such as "nitrogen" or a phrase such as 
"nox_expressed_as_nitrogen". "Aerosol" means the system of suspended 
liquid or solid particles in air (except cloud droplets) and their 
carrier gas, the air itself. Aerosol particles take up ambient water (a 
process known as hygroscopic growth) depending on the relative humidity 
and the composition of the particles. "Dry aerosol particles" means 
aerosol particles without any water uptake. "Pm2.5 aerosol" denotes 
atmospheric particulate compounds with an aerodynamic diameter of less 
than or equal to 2.5 micrometers.

mass_concentration_of_seasalt_cation_dry_aerosol_particles_in_air
kg m-3
Mass concentration means mass per unit volume and is used in the 
construction mass_concentration_of_X_in_Y, where X is a material 
constituent of Y. A chemical species denoted by X may be described by a 
single term such as "nitrogen" or a phrase such as 
"nox_expressed_as_nitrogen". "Aerosol" means the system of suspended 
liquid or solid particles in air (except cloud droplets) and their 
carrier gas, the air itself. Aerosol particles take up ambient water (a 
process known as hygroscopic growth) depending on the relative humidity 
and the composition of the particles. "Dry aerosol particles" means 
aerosol particles without any water uptake. "seasalt_cation" summarizes 
cationic sea salt componds. Depending on the model or the measurement, 
these are mainly sodium (Na+) but also potassium (K+), magnesium (Mg2+), 
calcium (Ca2+) and rarer cations. Where possible, the data variable 
should be accompanied by a complete description of the ions represented, 
for example, by using a comment attribute.

mass_fraction_of_pm10_seasalt_cation_dry_aerosol_particles_in_air
1
Mass fraction is used in the construction "mass_fraction_of_X_in_Y", 
where X is a material constituent of Y. It means the ratio of the mass 
of X to the mass of Y (including X). A chemical species denoted by X may 
be described by a single term such as "nitrogen" or a phrase such as 
"nox_expressed_as_nitrogen". Aerosol particles take up ambient water (a 
process known as hygroscopic growth) depending on the relative humidity 
and the composition of the particles. "Aerosol" means the system of 
suspended liquid or solid particles in air (except cloud droplets) and 
their carrier gas, the air itself. "Dry aerosol particles" means aerosol 
particles without any water uptake. "Pm10 aerosol" is an air pollutant 
with an aerodynamic diameter of less than or equal to 10 micrometers. 
"seasalt_cation" summarizes cationic sea salt componds. Depending on the 
model or the measurement, these are mainly sodium (Na+) but also 
potassium (K+), magnesium (Mg2+), calcium (Ca2+) and rarer cations. 
Where possible, the data variable should be accompanied by a complete 
description of the ions represented, for example, by using a comment 
attribute.

mass_fraction_of_pm2p5_seasalt_cation_dry_aerosol_particles_in_air
1
Mass fraction is used in the construction "mass_fraction_of_X_in_Y", 
where X is a material constituent of Y. It means the ratio of the mass 
of X to the mass of Y (including X). A chemical species denoted by X may 
be described by a single term such as "nitrogen" or a phrase such as 
"nox_expressed_as_nitrogen". "Aerosol" means the system of suspended 
liquid or solid particles in air (except cloud droplets) and their 
carrier gas, the air itself. Aerosol particles take up ambient water (a 
process known as hygroscopic growth) depending on the relative humidity 
and the composition of the particles. "Dry aerosol particles" means 
aerosol particles without any water uptake. "Pm2p5 aerosol" is an air 
pollutant with an aerodynamic diameter of less than or equal to 2.5 
micrometers. "seasalt_cation" summarizes cationic sea salt componds. 
Depending on the model or the measurement, these are mainly sodium (Na+) 
but also potassium (K+), magnesium (Mg2+), calcium (Ca2+) and rarer 
cations. Where possible, the data variable should be accompanied by a 
complete description of the ions represented, for example, by using a 
comment attribute.

atmosphere_mass_content_of_seasalt_cation_dry_aerosol_particles
1
"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 mass is the total mass of the particles. "Aerosol" means the 
system of suspended liquid or solid particles in air (except cloud 
droplets) and their carrier gas, the air itself. Aerosol particles take 
up ambient water (a process known as hygroscopic growth) depending on 
the relative humidity and the composition of the particles. "Dry aerosol 
particle" means aerosol particles without any water uptake. 
"seasalt_cations" summarizes cationic sea salt componds. Depending on 
the model or the measurement, these are mainly sodium (Na+) but also 
potassium (K+), magnesium (Mg2+), calcium (Ca2+) and rarer cations. 
Where possible, the data variable should be accompanied by a complete 
description of the ions represented, for example, by using a comment 
attribute.

mass_fraction_of_seasalt_cation_dry_aerosol_particles_in_air
1
Mass fraction is used in the construction mass_fraction_of_X_in_Y, where 
X is a material constituent of Y. It means the ratio of the mass of X to 
the mass of Y (including X). "Aerosol" means the system of suspended 
liquid or solid particles in air (except cloud droplets) and their 
carrier gas, the air itself. Aerosol particles take up ambient water (a 
process known as hygroscopic growth) depending on the relative humidity 
and the composition of the particles. "Dry aerosol particles" means 
aerosol particles without any water uptake. "seasalt_cation" summarizes 
cationic sea salt componds. Depending on the model or the measurement, 
these are mainly sodium (Na+) but also potassium (K+), magnesium (Mg2+), 
calcium (Ca2+) and rarer cations. Where possible, the data variable 
should be accompanied by a complete description of the ions represented, 
for example, by using a comment attribute.

mass_concentration_of_pm10_seasalt_cation_dry_aerosol_particles_in_air
kg m-3
Mass concentration means mass per unit volume and is used in the 
construction mass_concentration_of_X_in_Y, where X is a material 
constituent of Y. A chemical species denoted by X may be described by a 
single term such as "nitrogen" or a phrase such as 
"nox_expressed_as_nitrogen". "Aerosol" means the system of suspended 
liquid or solid particles in air (except cloud droplets) and their 
carrier gas, the air itself. Aerosol particles take up ambient water (a 
process known as hygroscopic growth) depending on the relative humidity 
and the composition of the particles. "Dry aerosol particles" means 
aerosol particles without any water uptake. "Pm10 aerosol" denotes 
atmospheric particulate compounds with an aerodynamic diameter of less 
than or equal to 10 micrometers. "seasalt_cation" summarizes cationic 
sea salt componds. Depending on the model or the measurement, these are 
mainly sodium (Na+) but also potassium (K+), magnesium (Mg2+), calcium 
(Ca2+) and rarer cations. Where possible, the data variable should be 
accompanied by a complete description of the ions represented, for 
example, by using a comment attribute.

mass_concentration_of_pm2p5_seasalt_cation_dry_aerosol_particles_in_air
kg m-3
Mass concentration means mass per unit volume and is used in the 
construction mass_concentration_of_X_in_Y, where X is a material 
constituent of Y. A chemical species denoted by X may be described by a 
single term such as "nitrogen" or a phrase such as 
"nox_expressed_as_nitrogen". "Aerosol" means the system of suspended 
liquid or solid particles in air (except cloud droplets) and their 
carrier gas, the air itself. Aerosol particles take up ambient water (a 
process known as hygroscopic growth) depending on the relative humidity 
and the composition of the particles. "Dry aerosol particles" means 
aerosol particles without any water uptake. "Pm2p5 aerosol" denotes 
atmospheric particulate compounds with an aerodynamic diameter of less 
than or equal to 2.5 micrometers. "seasalt_cation" summarizes cationic 
sea salt componds. Depending on the model or the measurement, these are 
mainly sodium (Na+) but also potassium (K+), magnesium (Mg2+), calcium 
(Ca2+) and rarer cations. Where possible, the data variable should be 
accompanied by a complete description of the ions represented, for 
example, by using a comment attribute.

mass_concentration_of_chloride_dry_aerosol_particles_in_air
kg m-3
Mass concentration means mass per unit volume and is used in the 
construction mass_concentration_of_X_in_Y, where X is a material 
constituent of Y. A chemical species denoted by X may be described by a 
single term such as 'nitrogen' or a phrase such as 
'nox_expressed_as_nitrogen'. The chemical formula for chloride is Cl-.

mass_fraction_of_chloride_dry_aerosol_particles_in_air
1
Mass fraction is used in the construction mass_fraction_of_X_in_Y, 
whereX is a material constituent of Y. It means the ratio of the mass of 
X to the mass of Y (including X). A chemical species denoted by X may be 
described by a single term such as 'nitrogen' or a phrase such as 
'nox_expressed_as_nitrogen'. The chemical formula for chloride is Cl-.

mole_concentration_of_chloride_in_air
mol m-3
Mole concentration means number of moles per unit volume, also called 
"molarity", and is used in the construction 
mole_concentration_of_X_in_Y, where X is a material constituent of Y. A 
chemical species denoted by X may be described by a single term such as 
'nitrogen' or a phrase such as 'nox_expressed_as_nitrogen'. The chemical 
formula for chloride is Cl-.




-- 
Daniel Neumann

Leibniz Institute for Baltic Sea Research Warnemuende
Physical Oceanography and Instrumentation
Seestrasse 15
18119 Rostock
Germany

phone: +49-381-5197-287
fax: +49-381-5197-114 or 440
e-mail: daniel.neumann at io-warnemuende.de
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