Created: Feb. 5, 2024

Proposer: Jonathan Gregory & Lars Barring

Proposed Date: 2024-01-10

#270

Change Date: Feb. 5, 2024, 4:58 p.m.

Term: **soil_thermal_conductivity**

Unit: W m-1 K-1

Unit ref: WAPK

AMIP:

GRIB:

Thermal conductivity is the constant k in the formula q = -k grad T where q is the heat transfer per unit time per unit area of a surface normal to the direction of transfer and grad T is the temperature gradient. Thermal conductivity is a property of the material.

Change Date: Feb. 5, 2024, 5 p.m.

Term: **soil_thermal_conductivity**

Unit: W m-1 K-1

Unit ref: WAPK

AMIP:

GRIB:

Thermal conductivity is the constant k in the formula q = -k grad T where q is the heat transfer per unit time per unit area of a surface normal to the direction of transfer and grad T is the temperature gradient. Thermal conductivity is a property of the material. It is strongly recommended to include a units_metadata attribute.

Change Date: Feb. 9, 2024, 3:53 p.m.

Term: **soil_thermal_conductivity**

Unit: W m-1 K-1

Unit ref: WAPK

AMIP:

GRIB:

Thermal conductivity is the constant k in the formula q = -k grad T where q is the heat transfer per unit time per unit area of a surface normal to the direction of transfer and grad T is the temperature gradient. Thermal conductivity is a property of the material. In order to convert the units correctly, it is essential to know whether a temperature is on-scale or a difference. Therefore this standard strongly recommends that any variable whose units involve a temperature unit should also have a units_metadata attribute to make the distinction. units_metadata="temperature: difference" means that the temperature quantity is the difference between two temperatures, so the origin of the scale is irrelevant, and only the unit of measure matters. It is strongly recommended to include the attribute units_metadata="temperature: difference".

Change Date: Feb. 23, 2024, 4:30 p.m.

Term: **soil_thermal_conductivity**

Unit: W m-1 K-1

Unit ref: WAPK

AMIP:

GRIB:

Thermal conductivity is the constant k in the formula q = -k grad T where q is the heat transfer per unit time per unit area of a surface normal to the direction of transfer and grad T is the temperature gradient. Thermal conductivity is a property of the material. It is strongly recommended that a variable with this standard name should have the attribute units_metadata="temperature: difference", meaning that it refers to temperature differences and implying that the origin of the temperature scale is irrelevant, because it is essential to know whether a temperature is on-scale or a difference in order to convert the units correctly (cf. https://cfconventions.org/cf-conventions/cf-conventions.html#temperature-units).