[ecco-support] [EXTERNAL] surface pressure in LLC4320

[Matthew Mazloff]

This is great - very helpful!

Much appreciated!
Matt


> On Oct 20, 2020, at 10:27 AM, Dimitris Menemenlis <dmenemenlis at gmail.com> wrote:
> 
> Hi Matt, yes you are correct.
> The equivalent sea level assuming all snow and ice is melted would be:
> SSH = ETA + sIceLoad / rhoConst
> sIceLoad = SIheff * SEAICE_rhoIce + SIhsnow * SEAICE_rhoSnow
> SEAICE_rhoIce = 910
> SEAICE_rhoSnow = 330
> rhoConst = 1027.5
> 
> Depending on application, you may want to remove tides and atmospheric
> pressure.  There is two ways to do that.  One is to compute steric height
> from Theta and Salt.  That means you need full 3D fields.  A second way is:
> steric = SSS - PhiBot - AtmosPres
> where PhiBot is bottom pressure and AtmosPres surface atmospheric
> pressure, including tidal-potential forcing.  This second way is accurate
> to within accuracy of model’s inverse barometer adjustment.
> Jinbo has done a more complete analysis of accuracy of above two methods
> that I can try to dig up, if it is needed.
> 
> D.
> 
> 
>> On Oct 20, 2020, at 9:53 AM, Matthew Mazloff <mmazloff at ucsd.edu> wrote:
>> 
>> Hello 
>> 
>> We love the LLC4320 - thank you!
>> 
>> We are analyzing the SO dynamics in it, and we need to know surface pressure. However ETAN appears to be the water column height under the sea ice. Is this correct - do we need to add sea ice loading?
>> 
>> If so would it be 
>>           sIceLoad  = HEFF * SEAICE_rhoIce + HSNOW * SEAICE_rhoSnow
>> And then 
>> 	phiSurf = ( etan + sIceLoad*recip_rhoConst ) *gravity
>> 
>> Much appreciated!
>> Matt
>> 
>> 
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