Air-sea flux parameterisation (aka bulk formula) in CM3

Atmosphere Unified Model
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1

Hi,

I’d like to understand how air-sea fluxes are computed in CM3 - specifically what flux parameterisation is used and which component does the calculation.

I know that in OM3 (with a data atmosphere) these fluxes are computed using Large & Yeager (2004) in the mediator (part of the coupling infrastructure).

Can anyone point me to relevant docs or code for CM3? Perhaps @kieranricardo @MartinDix ?

Thanks in advance!

CC @jemmajeffree who I know is interested to know this also.

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Hi there,

The air-sea fluxes are calculated in the atmosphere model, specifically in the JULES surface scheme. In JULES, the files you want to look at are in jules/src/science/surface, e.g. fcdch.F90 has routines for calculating the exchange coefficients, and the fluxes are calculated in jules_land_sf_explicit_jls.F90 and jules_land_sf_implicit_jls.F90.

I don’t have access to the MetOffice docs atm (waiting for a password reset, shouldn’t have let my account lapse!), but the code references “UM Documentation Paper No 24, section 8” which might point to specific papers.

Hope this helps!

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Thanks heaps Kieran! I will have a look :slight_smile: