[MITgcm-devel] Re: Large & Yeager 2004

[Patrick Heimbach]

Martin,

and another one(?)
Large & Yeager recommend albedo to be set to 0.066,
whereas exf has default of 0.1
So maybe change that one too?
I'll test it later.

-p.



On Dec 18, 2006, at 3:26 PM, Martin Losch wrote:

> Patrick,
>
> I have just put a run with large+yeager bulk formulae into the  
> queue. Would it make more sense to stop that job and do, what you  
> suggest (ocean_emissivity = 1)?
>
> Martin
>
> On 18 Dec 2006, at 20:52, Patrick Heimbach wrote:
>
>>
>> Dimitris,
>>
>> an update on this.
>> Different people seem to understand different things
>> when they talk about "bulk formulae".
>> I undetstood the derivation of buoyancy and momentum fluxes
>> from atmos. state involving the parameterization of the neutral
>> transfer coefficients, their stability corrections and the like,
>> thus deriving, taux & tauy, sensible & latent heat fluxes,  
>> evaporation.
>> The treatment of radiation is somewhat separate, since completely
>> decoupled from these "bulk formulae".
>>
>> However, in fact it seems that this minor detail might be
>> the only relevant part that distinguishes our current
>> exf implementation from the Large & Yeager 2004 recommendations,
>> i.e. they suggest ocean_emissivity to be set to 1,
>> whereas exf has a default of 0.97
>> (and bulkf_force a default of 0.985).
>>
>> So I'll conduct another run with changed emissivity
>> (the 3% difference should in fact have a discernable impact).
>>
>> -Patrick
>>
>>
>>
>> On Dec 17, 2006, at 12:26 PM, Dimitris Menemenlis wrote:
>>
>>> Patrick, thank you for info re bulk formulae.
>>> This is indeed very useful information.
>>> Dimitris
>>
>> ---
>> 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
>>
>>
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---
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