[MITgcm-devel] update on radiation part of bulk code

[Patrick Heimbach]

Hi there,
the typical chaotic mail from an Internet Cafe in (the other/real?)
Klinsmann-Land.
I conducted 3 more experiments, all compute net
lwflux and swflux from lwdown and swdown
(1) ocean_emissivity=0,97, exf_albedo=0.1 (exf default)
(2) ocean_emissivity=1, exf_albedo=0.066  (recommendations in LY04)
(3) ocean_emissivity=1, exf_albedo=0.1    (a mix between LY04 and default)(exf
default is cean_emissivity=0.97).
Results are a mixed bag:
(1) has worst of all Theta & SST costs, best of all salt cost,
    compared to lwflux, swflux case.
(2) significantly deteriorates Theta
    (8% on Argo), SST (117%) and sea-ice cost (15%),  
    and significantly improves Salt (30% on Argo)
(3) slightly deteriorates Theta (5% on Argo), SST (76%), 
    and sea-ice cost (13%),     
    and slightly improves Salt (15% on Argo)

So if one wanted to improve only salinity costs,
one would go for option (1), if one cared only for Theta, SST
costs one would do none of 1,2,3, but stick to net fluxes
(or, if one had to pick, would choose option 3, but still
bad in Theta, SST).

Seems to me that both that theta deteriorates (so significantly), and
salt improves (so significantly) are surprising.
Seems to signify also that recommendations for radiation part in
LY04 is strongly tied to the use of their CORE fields.
So, ...(?)

-p.

---
Dr Patrick Heimbach | heimbach at mit.edu | http://www.mit.edu/~heimbach
MIT | EAPS, 54-1518 | 77 Massachusetts Ave | Cambridge, MA 02139, USA
FON: +1-617-253-5259 | FAX: +1-617-253-4464 | SKYPE: patrick.heimbach