[MITgcm-support] packages: exf & bulk_force

[Martin Losch]

exf(+cal, does not work without it) and bulk_force are exclusive  
packages. I am surprised that you can even run them together.
With exf, you can use the wind vector, air temperature, specific  
humidity, downward radiation in the "longwave" and "shortwave" band  
(lwdown, swdown). swdown contains the effects of clouds. I have  
written a routine that estimates swdown and lwdown from air  
temperature, dewpoints temperature and clouds, naturally without any  
warranty, but it could be a starting point for you. The time  
calculations need adjustment/work. There are various bulk formulae  
for these fluxes and I used a specific set that is used for the  
Arctic at AWI, you'll find more here:
<http://www.faqs.org/faqs/meteorology/temp-dewpoint>

Martin

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On 4 Jun 2008, at 23:18, Van Thinh Nguyen wrote:

> Hi,
>
> I would like to simulate wind forcing & heat flux on the surface of  
> a lake, I have a bit confusion when I used 2 pkgs 'exf' and  
> 'bulk_force' together. Because some of routines in these pkgs are  
> quite the same. I have 2 following questions:
>
> 1) When I use pkg 'bulk_force' & 'exf' I can input wind, air  
> temperature, solar, humidity & clouds which I can get from  
> observations, however to do that I got the "namelist" error, since  
> I have to turn on pkg 'cal'.
>
> 2) if I use only pkg 'exf', could someone please tell me how can I  
> calculate lwdown/swdown from above parameters?
>
> Thanks a lot!
>
>
> Vth
>
>
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