Dear Matthias,
I don't think it's down to CF to specify whether mole or mass fluxes are used. The existing mole fluxes were set up to support modelling, but every sediment trapper I've ever encountered uses mass fluxes. Both need supporting through Standard Names.
Cheers, Roy.
________________________________________
From: CF-metadata [cf-metadata-bounces at cgd.ucar.edu] On Behalf Of Matthias Lankhorst [mlankhorst at ucsd.edu]
Sent: 10 October 2013 00:16
To: cf-metadata at cgd.ucar.edu
Cc: OceanSITES Data Management Team
Subject: [CF-metadata] standard names for sediment trap data
Dear CF community,
in the OceanSITES project, we would like to publish data from sediment traps
in files, using the CF conventions. Sediment traps are devices moored
underwater in the ocean, which collect sinking particles (detritus) in a
funnel and into sample bottles for later analyses. Analyses can be done for a
variety of substances. It looks like we need a few more standard names for
these, and possibly a discussion whether some of them should be expressed as
mass fluxes or as substance amount (mole) fluxes.
I noticed that CF already has these standard names, all as mole fluxes with
canonical units of mol m-2 s-1:
sinking_mole_flux_of_aragonite_expressed_as_carbon_in_sea_water
sinking_mole_flux_of_calcite_expressed_as_carbon_in_sea_water
sinking_mole_flux_of_particulate_iron_in_sea_water
sinking_mole_flux_of_particulate_organic_matter_expressed_as_carbon_in_sea_water
sinking_mole_flux_of_particulate_organic_nitrogen_in_sea_water
sinking_mole_flux_of_particulate_organic_phosphorus_in_sea_water
sinking_mole_flux_of_particulate_silicon_in_sea_water
Here is the list of quantities that we need to address in OceanSITES. My
initial proposal is to introduce them all as mass fluxes with canonical units
of kg m-2 s-1. If we should rather go with mole fluxes like the ones above,
please chime in.
Total/organic mass:
Propose new standard names:
sinking_mass_flux_of_particulate_matter_in_sea_water
sinking_mass_flux_of_particulate_organic_matter_in_sea_water
(I suppose these are understood as dry mass, i.e. weighed after water has
evaporated.)
Particulate organic, inorganic, total carbon:
Propose new standard names:
sinking_mass_flux_of_particulate_organic_carbon_in_sea_water
sinking_mass_flux_of_particulate_inorganic_carbon_in_sea_water
sinking_mass_flux_of_particulate_carbon_in_sea_water
(or should we include "total" somewhere in the latter?)
Particulate organic, inorganic, total nitrogen:
Propose new standard names:
sinking_mass_flux_of_particulate_organic_nitrogen_in_sea_water
sinking_mass_flux_of_particulate_inorganic_nitrogen_in_sea_water
sinking_mass_flux_of_particulate_nitrogen_in_sea_water
(or should we include "total" somewhere in the latter?)
Other particulate substances from a list:
Propose new standard names for each of the following, to be constructed as:
sinking_mass_flux_of_particulate_XXX_in_sea_water,
where XXX is:
- aluminum
- iron
- phosphorous
- silica
- biogenic_silica
- lithogenic_silica
- calcium
- titanium
- manganese
- barium
- magnesium
Your expert comments are highly appreciated!
Respectfully, Matthias
--
_______________________________________
Dr. Matthias Lankhorst
Scripps Institution of Oceanography
9500 Gilman Drive, Mail Code 0230
La Jolla, CA 92093-0230
USA
Phone: +1 858 822 5013
Fax: +1 858 534 9820
E-Mail: mlankhorst at ucsd.edu
http://www-pord.ucsd.edu/~mlankhorst/
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Received on Fri Oct 11 2013 - 01:11:51 BST
