[MITgcm-devel] depressed Eta and sIceLoad

[Jinlun Zhang]

Hi Martin,

Good to know both advection and the fix help. Thanks for the exp's.

Jinlun

Martin Losch wrote:

> Hi Jinlun et al.,
>
> please have a quick look at 10day averages of HEFF and HSNOW in July  
> and January (after 100 years) in
> http://mitgcm.org/~mlosch/ice_iter72360.png (Jul)
> http://mitgcm.org/~mlosch/ice_iter72020.png (Jan)
> run22 is without advection of snow (both runs are with evap*(1- 
> area)), run26 is with advection of snow. Unfortunately, the runs are  
> not exactly comparable because I had to use a 1-order upwind scheme  
> for advection the snow, so that run26 uses the 1-order upwind scheme  
> (for HSNOW, HEFF and AREA) and run22 the traditional 2nd order  
> central differences scheme (but only for HEFF and AREA), no  
> "flooding" in either case. What you see is that the advection reduces  
> the amplitudes of the snow be a factor of 100, but maybe that's just  
> the 1-order upwind scheme? Also the snow is in areas where it  
> shouldn't be.
> Not shown: My (it's not mine, but as opposed to Jinlun's suggestion)  
> simple flooding scheme removes this snow at the "expense" of much  
> increased ice thicknesses, Jinlun's scheme reduces the snow heights  
> even further (I only have 10year yet, but it's already <20cm as  
> opposed to <50cm in "my" runs), and the ice thickness is not  
> increased as much. Also the freshwater flux into the ocean appears to  
> be reduced (higher surface salinities) so that as a first conclusion  
> I would say that Jinlun's fix appears to be quite appropriate (as  
> opposed to mine). More analyses to follow.
>
> Martin
>
>
> On 24 Oct 2006, at 23:19, Jinlun Zhang wrote:
>
>> Hi Martin,
>> Advecting snow is certainly better than not, but I am not sure if  it 
>> would solve the problem of getting big numbers for snow.
>> Jinlun
>>
>> mlosch at awi-bremerhaven.de wrote:
>>
>>> Hi Jinlun,
>>> thanks, I'll try this out tomorrow. What about advecting HSNOW?  Why 
>>> can that be neglected?
>>>
>>> Martin
>>>
>>> Martin Losch
>>> Alfred Wegener Institute Postfach 120161, 27515 Bremerhaven,  
>>> Germany; Tel./Fax: ++49(0471)4831-1872/1797
>>>
>>>
>>>
>>> ----- Original Message -----
>>> From: Jinlun Zhang <zhang at apl.washington.edu>
>>> Date: Tuesday, October 24, 2006 7:56 pm
>>> Subject: Re: [MITgcm-devel] depressed Eta and sIceLoad
>>>
>>>
>>>> Dimitris and all,
>>>> The ncep precip in Antarctic is way too much, but I have moidfied  
>>>> growth.F  to, hopefully, improve things a little bit. The  
>>>> modification would allow the ocean to melt  the left-over snow  
>>>> when ice is gone (seach jz for the modi's in the code) . See if  
>>>> there is any improvement ot of it.
>>>> Jinlun
>>>>
>>>> Dimitris Menemenlis wrote:
>>>>
>>>>
>>>>> It looks bad:
>>>>> http://ecco2.jpl.nasa.gov/data2/cube/cube38/pickup/HSNOW.jpg
>>>>> 20 to 60 m of snow over open water.  This is after a 12-year
>>>>> integration on the cubed sphere.
>>>>>
>>>>> Dimitris
>>>>> _______________________________________________
>>>>> MITgcm-devel mailing list
>>>>> MITgcm-devel at mitgcm.org
>>>>> http://mitgcm.org/mailman/listinfo/mitgcm-devel
>>>>>
>>>> -- 
>>>>
>>>> Jinlun Zhang
>>>> Polar Science Center, Applied Physics Laboratory
>>>> University of Washington, 1013 NE 40th St, Seattle, WA 98105-6698
>>>>
>>>> Phone: (206)-543-5569;  Fax: (206)-616-3142
>>>> zhang at apl.washington.edu
>>>> http://psc.apl.washington.edu/pscweb2002/Staff/zhang/zhang.html
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
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