[CIG-MC] CitcomS, generating grd input file

Hammond, Noah noah_hammond at brown.edu
Wed Jun 18 14:55:32 PDT 2014

Thank you.

Can the ASCII file have 4 columns, (lat, lon, radius, temperature)? I am
also required to install HC, is that right?

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? 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?

Thanks once more for your help!

On Tue, Jun 17, 2014 at 3:52 PM, Hammond, Noah <noah_hammond at brown.edu>

> 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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