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diffusivity of heat to Co2 #184

Open penguian opened 3 years ago

penguian commented 3 years ago

keyword_keepgit owner:jxs599@nci.org.au type_defect | by mgk576

CABLE assumes 1.32 for the diffusivity of heat to CO2, this seems to come from (see Bonan table A.3)

(2.08 / 2.4) * 1.52 [(diffusivity of heat / diffusivity of water) * diffusivity of co2] = 1.32

This is at 15 deg C.

The diffusivity of stomatal conductance to CO2 in cable = 1.57, which seems to be derived from data at 20 deg C.

See Campbell and Norman table 7.1, the rgbwc term at 20 deg C would be:

(2.14 / 2.4) * 1.57= 1.4

Issue migrated from trac:277 at 2023-11-27 11:35:30 +1100

penguian commented 3 years ago

@mgk576@nci.org.au commented

Sorry, that was written incorrectly...

diffusivity of water / diffusivity of CO2 at 15 deg is 24 / 15.2 = 1.579 but at the same temperature diffusivity of heat / diffusivity of CO2 is 20.8 / 15.2 = 1.368 not 1.32

At 20 degrees:

diffusivity of water / diffusivity of CO2 = 1.529 diffusivity of heat / diffusivity of CO2 = 1.363

penguian commented 1 year ago

@ccc561@nci.org.au commented

Asking Martin to clarify what the issue is.

penguian commented 1 year ago

@ccc561@nci.org.au set keywords to keepgit