Hello All,
We have two outstanding CF metadata requirements for the LUMIP CMIP6 data request.
(1) An area type is needed for non-woody, or herbaceous, vegetation.
LUMIP variable: nwdFracLut Percentage of land use tile that is non-woody vegetation ( e.g. herbaceous crops)
Plants can be divided into "woody" and "herbaceous" categories. The "woody" plants have stems which are adapted to survive harsh winters without any leaf cover.
Proposed area_type: herbaceous_vegetation
Herbaceous plants are plants with very flexible stems. Their leaves and stems die down to soil level at the end of every growing season. Herbaceous plants can be annual, biennial or perennial.
(2) fLulccAtmLut carbon transferred directly to atmosphere due to any land-use or land-cover change activities including deforestation or agricultural fire [kg m-2 s-1]
The new requirement here is the identification of "direct" transfer into the atmosphere, which means direct from the soil and vegetation to the atmosphere, excluding fluxes that enter the atmosphere through a pathway which involves intermediary stages as forestry and agricultural products (e.g. wood harvested for energy generation).
There is an existing name for a flux which includes the fluxes via forestry and agricultural products:
"surface_upward_mass_flux_of_carbon_dioxide_expressed_as_carbon_due_to_anthropogenic_land_use_or_land_cover_change".
I propose extending this name to express the exclusion of the "products":
"surface_upward_mass_flux_of_carbon_dioxide_expressed_as_carbon_due_to_anthropogenic_land_use_or_land_cover_change_excluding_forestry_and_agricultural_products"
regards,
Martin
________________________________
From: David Lawrence <dlawren at ucar.edu>
Sent: 17 April 2018 22:04
To: Juckes, Martin (STFC,RAL,RALSP)
Cc: Pamment, Alison (STFC,RAL,RALSP)
Subject: Re: LUMIP data request: CF metadata
For (1), yes herbaceous vegetation would be fine.
For (2), yes, the units should be kg m-2 s-1. The revised standard name is fine.
Thanks,
Dave
On Tue, Apr 17, 2018 at 8:08 AM, Martin Juckes - UKRI STFC <martin.juckes at stfc.ac.uk<mailto:martin.juckes at stfc.ac.uk>> wrote:
Hello David,
I have a couple of questions we need to clear up to finalise the CF metadata for the LUMIP data request.
(1) nwdFracLut Percentage of land use tile that is non-woody vegetation ( e.g. herbaceous crops)
What is meant by "non-woody vegetation"? We will probably deal with this variable by defining an area type in the CF area type table:
http://cfconventions.org/Data/area-type-table/7/build/area-type-table.html.
Could we use the phrase "herbaceous_vegetation"?
(2) fLulccAtmLut carbon transferred directly to atmosphere due to any land-use or land-cover change activities including deforestation or agricultural fire [ kg s-1]
This variable looks similar to fLulccProductLut<
http://clipc-services.ceda.ac.uk/dreq/u/3e26b8a6-b89b-11e6-be04-ac72891c3257.html>, but the latter has units kg m-2 s-1: should fLulccAtmLut have the same units, kg m-2 s-1 (it is currently specified with kg s-1)?
If that is the case, we could use a standard name of the form "Surface_upward_mass_flux_of_carbon_dioxide_expressed_as_carbon_due_to_anthropogenic_land_use_or_land_cover_change_excluding_forestry_and_agricultural_products", which is adapted from the existing name "surface_upward_mass_flux_of_carbon_dioxide_expressed_as_carbon_due_to_anthropogenic_land_use_or_land_cover_change"
This approach results in a very long name, but I think we need it in this case to avoid confusion about the different pathways for emission to the atmosphere,
regards,
Martin
Received on Wed Apr 18 2018 - 00:48:21 BST
