Hi all, I'm getting confused now. I understood Alison last proposal as keeping only one name :
surface_upward_mass_flux_of_carbon_dioxide_expressed_as_carbon_due_to_anthropogenic_emission; kg m-2 s-1 surface_upward_mass_flux_of_carbon_dioxide_expressed_as_carbon_due_to_emission_from_fossil_fuel_combustion; kg m-2 s-1.Philip's mail, seemed to imply that both names could be used as he liked Alison's distinction...
Could you clarify what the final decision?For info, yes the data do include aircraft, chimneys,... emissions as these data are derived from country based reporting of fossil fuel trades. Hence the aircraft emissions from US carriers are in the US numbers and hence assigned on the US territory. This might be OK for US as most of the flight are domestic, but I'm sure this is 99.9 % wrong for Belgium ;-). Saying emissions are a vertical integral here would imply that planes are only flying up and down !
Anyway, I will leave with either or definition (you'll just have to explain what the "tendency" one mean to non-chemists...)
Best Pierre On 22/09/2010 17:28, Cameron-smith, Philip wrote:
Hi All, Even if the dataset doesn't have vertical information, if it includes aircraft emissions then the physical quantity it is quantifying is the vertical integral rather than the surface emission. In which case I would favour tendency_of_atmosphere_mass_content_ If there are no aircraft in the data, then do smoke stacks produce 'surface emissions'? An interesting question that could be debated. Hence, another advantage of tendency_of_atmosphere_mass_content_ is that it makes the question moot. BTW, FWIW, I note that the closest related standard name already in the table specifies the downward direction (surface_downward_mass_flux_of_carbon_dioxide_expressed_as_carbon). On a different note, I like Alison's distinction between tendency_of_atmosphere_mass_content_of_..._due_to_anthropogenic_emission and surface_upward_mass_flux_of_..._due_to_anthropogenic_emission Perhaps we should cross-reference such standard names in their descriptions to help future users? Best wishes, Philip ------------------------------------------------------------------------ Dr Philip Cameron-Smith, [email protected], Lawrence Livermore Nat. Lab. -----------------------------------------------------------------------------Original Message----- From: [email protected] [mailto:cf-metadata- [email protected]] On Behalf Of Pierre Friedlingstein Sent: Wednesday, September 22, 2010 6:01 AM To: [email protected] Cc: [email protected] Subject: Re: [CF-metadata] CMIP5 carbon cycle standard names Alison, I see your point. As far as I know the anthropogenic emissions data will be surface fluxes. Data are based on country level consumption of fossil fuel, they don't have the info on where in the air it is released... Pierre On 22/09/2010 13:04, [email protected] wrote:Hi Pierre, My thinking here was that 'anthropegenic emissions' (which presumably include fossil fuel emissions) and 'fossil fuel' emissions themselves do not necessarily always occur at the earth's surface. For example, emissions from tall chimneys and aircraft may occur at many levels in the atmosphere. It was not clear to me that these particular quantities in the CMIP5 tables are intended only to account forsurface emissions.If that is the case, then we certainly need to make it clear and I agree with your suggestion to label them as surface fluxes. Soinsteadof introducingtendency_of_atmosphere_mass_content_of_carbon_dioxide_expressed_as_carbo n_due_to_anthropogenic_emission; kg m-2 s-1tendency_of_atmosphere_mass_content_of_carbon_dioxide_expressed_as_carbo n_due_to_emission_from_fossil_fuel_combustion; kg m-2 s-1 I will addsurface_upward_mass_flux_of_carbon_dioxide_expressed_as_carbon_due_to_an thropogenic_emission; kg m-2 s-1surface_upward_mass_flux_of_carbon_dioxide_expressed_as_carbon_due_to_em ission_from_fossil_fuel_combustion; kg m-2 s-1. OK? Best wishes, Alison ------ Alison Pamment Tel: +44 1235 778065 NCAS/British Atmospheric Data Centre Fax: +44 1235 446314 Rutherford Appleton Laboratory Email:[email protected]Chilton, Didcot, OX11 0QX, U.K.-----Original Message----- From: Pierre Friedlingstein [mailto:[email protected]] Sent: 21 September 2010 16:41 To: Pamment, Alison (STFC,RAL,SSTD) Cc: [email protected]; [email protected] Subject: Re: [CF-metadata] CMIP5 carbon cycle standard names Hi Alison, Just wondering, why are the first two variables below named as "tendency_of_atmosphere_mass_content_of..." while all others are named as "surface_upward_mass_flux_of_ ..." Any reason ? I know the "tendency..." is used for other chemical species... Butherefor CO2 variables, I think intra-consistency should be favoured. No?Best Pierre On 21/09/2010 13:40, [email protected] wrote:Dear Jonathan and Pierre, Thank you both for your comments on the CMIP5 carbon cycle names. Looking back through this thread I think we have resolved all the outstanding issues and so the following names are now accepted for inclusion in the standard name table:tendency_of_atmosphere_mass_content_of_carbon_dioxide_expressed_as_carbo n_due_to_anthropogenic_emission; kg m-2 s-1tendency_of_atmosphere_mass_content_of_carbon_dioxide_expressed_as_carbo n_due_to_emission_from_fossil_fuel_combustion; kg m-2 s-1 surface_upward_mass_flux_of_carbon_due_to_natural_emission; kg m-2s-1 atmosphere_mass_of_carbon_dioxide; kg carbon_content_of_products_of_land_use_change; kg m-2surface_upward_flux_of_carbon_dioxide_expressed_as_carbon_due_to_emissio n_from_fires_excluding_land_use_change; kg m-2 s-1surface_upward_flux_of_carbon_dioxide_expressed_as_carbon_due_to_emissio n_from_grazing; kg m-2 s-1surface_upward_flux_of_carbon_dioxide_expressed_as_carbon_due_to_emissio n_from_crop_harvesting; kg m-2 s-1surface_net_upward_flux_of_carbon_dioxide_expressed_as_carbon_due_to_emi ssion_from_anthropogenic_land_use_change; kg m-2 s-1surface_net_downward_flux_of_carbon_dioxide_expressed_as_carbon_due_to_photosynthesis_and_respiration_and_fires_including_land_use_change;kg m-2 s-1 carbon_flux_into_soil_from_litter; kg m-2 s-1 carbon_flux_into_soil_from_vegetation_excluding_litter; kg m-2 s-1 leaf_carbon_content; kg m-2 wood_carbon_content; kg m-2 root_carbon_content; kg m-2 carbon_content_of_miscellaneous_living_matter; kg m-2 (N.B. 'miscellaneous' means carbon content of living matter apart fromthoseindividually named in the preceding three items) wood_debris_carbon_content; kg m-2 surface_litter_carbon_content;kgm-2 subsurface_litter_carbon_content; kg m-2 fast_soil_pool_carbon_content; kg m-2medium_soil_pool_carbon_content;kg m-2 slow_soil_pool_carbon_content; kg m-2surface_upward_carbon_flux_due_to_plant_respiration_for_biomass_growth; kg m-2 s-1surface_upward_carbon_flux_due_to_plant_respiration_for_biomass_maintena nce; kg m-2 s-1 net_primary_productivity_of_carbon_accumulated_in_leaves; kg m-2 s-1net_primary_productivity_of_carbon_accumulated_in_wood; kg m-2 s-1 net_primary_productivity_of_carbon_accumulated_in_roots; kg m-2 s-1surface_net_downward_flux_of_carbon_dioxide_expressed_as_carbon_due_to_photosynthesis_and_respiration_and_fires_excluding_land_use_change;kg m-2 s-1. To cope with the various fractional vegetation coverage quantitieswewill use the existing standard name area_fraction and introduce new entries of primary_evergreen_trees, secondary_deciduous_trees, secondary_evergreen_trees, C3_plant_functional_types, C4_plant_functional_types into the area_type table. Best wishes, Alison ------ Alison Pamment Tel: +44 1235 778065 NCAS/British Atmospheric Data Centre Fax: +44 1235 446314 Rutherford Appleton Laboratory Email:[email protected]Chilton, Didcot, OX11 0QX, U.K.
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