Hi Martina,
Couple of points. Would the term 'total' be better than 'lumped' - lumped to me is slang. We've also used 'total' before to convey similar semantics (e.g. total_reactive _nitrogen).
Definitions of anthropogenic, biogenic, passive, oxygenated would be useful.
Cheers, Roy.
>>> Martina Stockhause <martina.stockhause at zmaw.de> 09/17/08 2:38 PM >>>
Dear all,
a group of chemical modellers discussed the standardization of the chemical
constituents and aerosols in the GRIB2 standard. I assist them. As sources we
used the parameters used in different intercomparison projects: GEMS
(
http://gems.ecmwf.int/), CCMVal (
http://www.pa.op.dlr.de/CCMVal/), TFHTAP
(
http://www.htap.org).
Martin Suttie from ECMWF / GEMS created a two tables approach for GRIB2: one
for the physical quantity and one for the chemical constituent or aerosol.
Thus, a physical-chemical quantity (= CF standard name) is a combination of
these two parameters. Since, we want to connect GRIB2 standard closely to the
CF standard names, we used CF standard names in the proposal for WMO and
propose here the missing CF standard names used in our WMO proposal.
1. NEW physical parameters for chemical constituent X:
I read the discussion about 'burden' in the mailing archive. It seems that the
scientists stick to 'burden' as a common term in the community and have
started to use it for the creation of CF-like standard names (e.g. in
CCMVal), because CF couldn't offer an acceptable alternative.
Neither 'global_integral' nor 'burden' could be agreed on in the CF mailing
list. Sorry, for starting that discussion again without offering a new
alternative. Since the CF standard names should be self-explanatory for those
who create and analyse data, we propose the standard
name 'total_yearly_average_burden_of_X_in_atmosphere' among others:
column_integrated_mass_density_of_X_in_air : kg.m-2
tendency_of_atmosphere_mass_content_of_X_due_to_respiration : kg.m-2.s-1
tendency_of_mole_concentration_of_X_due_to_chemical_gross_production :
mol.m-3.s-1
tendency_of_mole_concentration_of_X_due_to_chemical_gross_destruction :
mol.m-3.s-1
total_yearly_average_burden_of_X_in_atmosphere : mol
total_yearly_averaged_atmospheric_loss_of_X : mol.s-1
surface_area_density_of_X : m-1
2. NEW chemical constituents:
We suggest to use the keyword 'lumped' to indicate a certain group of species
showing similar chemical behaviour (PRISM definition). And to
introduce 'anthropogenic' and 'biogenic' for the origin of the organic
compound NMVOC.
atomic_oxygen
nitrate_radical
nitrous_acid
radon
methyl_peroxy_radical
methanol
formic_acid
aceto_nitrile
ethanol
acetic_acid
butane
alpha_pinene
beta_pinene
limonene
hcfc141b
hcfc142b
nitric_acid_trihydrate_aerosol
hox_expressed_as_hydrogen : HOx radical (OH+HO2)
total_peroxy_radical : Total inorganic and organic peroxy radicals (HO2 + RO2)
passive_ozone
noy_expressed_as_nitrogen : All nitrogen oxides (NOy) expressed as nitrogen
clox_expressed_as_chlorine : Total inorganic chlorine except HCl, ClONO2: ClOx
brox_expressed_as_bromine : Total inorganic bromine except HBr, BrONO2: BrOx
lumped_alkanes
lumped_alkenes
lumped_aromatic_compounds
lumped_terpenes
nmvoc_expressed_as_carbon : Non-methane volatile organic compounds expressed
as carbon
anthropogenic_nmvoc_expressed_as_carbon : anthropogenic
nmvoc_expressed_as_carbon
biogenic_nmvoc_expressed_as_carbon : biogenic nmvoc_expressed_as_carbon
lumped_oxygenated_hydrocarbons
3. NEW CF standard names:
The individual CF standard names, resulting from the combination of physical
quantity and chemical constituent or aerosol, are quite many (see attached
file).
I apologize for this long list. My idea to move the name of the chemical
constituent or aerosol from the standard name into an attribute was dismissed
by the scientists. The disadvantage of a CF standard name without the
constituent was larger than the advantage of a smaller number of CF standard
names to be proposed.
Since I had to use a script for the generation of these individual CF names,
there might be some names in the list, which doesn't make sense. Therefore a
counter-check is necessary and highly appreciated.
Thank you and best wishes,
Martina
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Received on Fri Sep 19 2008 - 09:40:51 BST
