[CIG-MC] CitcomS, generating grd input file

Thorsten Becker thorstinski at gmail.com
Thu Jun 19 00:48:05 PDT 2014

On Wed, Jun 18, 2014 at 11:55 PM, Hammond, Noah <noah_hammond at brown.edu>

> Thank you.
> Can the ASCII file have 4 columns, (lat, lon, radius, temperature)? I am
> also required to install HC, is that right?
> no, the grids need to be separated by layer depth, netcdf can only handle
x-y grids. yes, you need to install HC for the grd handling capabilities.

> On a related note, the manual states that Mike Gurnis added the capability
> for CitcomS to use geographically dependent surface temperature boundary
> conditions. Can you explain how these conditions are implemented using grd
> files?

these are two different ways of specifying thermal and mechanical BCs. Mike
uses nodal locations, where the BCs are read in similar to what the code
outputs, node-by-node. i implemented the grd input. the latter is less well
documented, regrettably.

> Earlier you mentioned that geographically dependent basal heat flow
> boundary conditions are not possibly with this version of the code, but
> could a similar approach (using grd files) be used to implement a spatially
> dependent heat flux at the base?
> Yes, pretty easily. Either with grds or with nodal values.

> Thanks once more for your help!
> On Tue, Jun 17, 2014 at 3:52 PM, Hammond, Noah <noah_hammond at brown.edu>
> wrote:
>> In response to your reply:
>> Yes I can use GMT.  Is the idea to use GMT to generate a grd file from an
>> ASCII file? What form should the ASCII file have? I am guessing it should
>> be a series of temperature values that correspond to each node, listed in
>> same order as the node ordering.
>> For a full sphere, would there be just one grd file, or one for each
>> spherical cap?
>> Thanks for the help!
>> -Noah Hammond
>> On Mon, Jun 16, 2014 at 3:24 PM, Hammond, Noah <noah_hammond at brown.edu>
>> wrote:
>>> Can you direct me towards resources which describe how to generate grd
>>> files?
>>> I am using CitcomS 3.2.0 and would like to use tic_method=4, where the
>>> initial temperature is read from a grd file.
>>> Thank you for your time!!
>>> -Noah Hammond
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