[aspect-devel] The output of nonadiabatic_temperature

[Juliane Dannberg]

Hi Nan,

there are different options for outputting the temperature difference 
between plume and background mantle, and which one you want to use 
depends on what exactly you want to know:

If you use the "nonadiabatic temperature", you will get the excess 
temperature of the plume with respect to an adiabatic mantle temperature 
profile. If you are worried your adiabat will change over time, there is 
an update() function in the interface of the adiabatic conditions, so in 
principle you could use an existing model for the adiabatic conditions 
and implement this function, and then your adiabatic profile would be 
updated every time step.

Alternatively, if you want to compare the plume temperature to the 
current average mantle temperature at a given depth, you can use 
Aspect's "depth average" postprocessor. It computes depth averaged 
quantities (including the temperature) and writes them into a separate 
output file.

Best,
Juliane


On 10/11/2016 04:23 AM, Nan Zhang wrote:
> Hi all,
>
> I am doing a compressible model and try to plot the plume structure. 
> The plume is defined by the high temperature difference from current 
> average temperature at every depth. I see ASPECT has an output 
> "nonadiabatic_temperature". I wonder if this output serves my purpose?
>
> What I concerned is if the adiabatic temperature is not exactly the 
> same as my average temperature at every depth. When I set up my model, 
> I initialize the adiabatic temperature profile with specific 
> parameters. In theory, it should be the same as the average 
> temperature at every depth. But, after billion year calculation, the 
> average temperature at every depth deviates away from the initial 
> adiabatic temperature profile.
>
> So, I wonder if there is an output "average_subtracted_temperature" in 
> ASPECT? If so, it could also serve the plume in the incompressible 
> convection model.
>
> Bests,
> Nan
>
>
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