## the temperature of the bottom of the bed of the ice

Extension of Elmer in computational glaciology
zhang liangfu
Posts: 22
Joined: 20 Nov 2014, 05:06
Antispam: Yes

### the temperature of the bottom of the bed of the ice

Hi every one,
I was doing some research in the temperature of the antarctic ice sheet,I add the temperature as the website said

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``http://elmerice.elmerfem.org/wiki/doku.php?id=solvers:temperature``
.
Every thing goes well ,but when I want to obtain the temeprature,the problem occurs.the temperature of the bottom is 274 but the pressure melting point I set was
!! pressuremeltingpoint (in SI units)
\$ function pressuremeltingpoint2(D) {\
P = 910*D*9.81;\
if (P<0.0) P=0.0;\
beta=9.8E-08;\
_pressuremeltingpoint2=273.15-(beta*P);\
}
In my opinion ,the temperature must be under the pressure melting point,the results I obtain as follows:
[img]
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By the way ,I also have some questions about the parameter of the glen's law .in my sif file I set the parameters as follows:
! Prefactor from Cuffey and Paterson (2010) in MPa^{-3} a^{-1}
\$A1 = 1.258e13
\$A2 = 6.046e28
\$Q1 = 78.80e3
\$Q2 = 139.0e3
I do not know where I can obtain these parameters or what parameters should I set .
I am a newer,any help is welcome

looking forward to everyone of you
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joeatodd
Posts: 34
Joined: 02 Feb 2012, 18:49
Antispam: Yes

### Re: the temperature of the bottom of the bed of the ice

Hey,

For the temperature problem, did you set the following in the temperature solver section?

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``````Loop While Unconstrained Nodes = Logical True
``````
For the values of the parameters you mention, reasonable values are listed on this page:
http://elmerice.elmerfem.org/wiki/doku. ... y&s[]=glen