[MITgcm-support] External orbiting forces!

[taimaz.bahadory]

Thanks for your reply
I'll check with David
Have a nice day (or night!)



On Fri, Sep 14, 2012 at 2:35 PM, Brian Rose <brose at atmos.washington.edu>wrote:

> Talmaz,
>
> Insolation is "hard coded" in the regular version of AIM.  There is a
> modified version that computes insolation for arbitrary obliquity but zero
> eccentricity (based on formulas from Hartmann 1994).  I don't know if the
> modifications have made it into the standard distribution, but check with
> David Ferreira (dfer at mit.edu).
> You'll probably have to do some custom coding to run AIM with full orbital
> parameters.
>
> I've often thought that someone should write an separate package to handle
> insolation and orbital parameters, so that it could interface with any
> atmospheric physics package.  But we're not there yet.
>
> Hope this helps
> Brian
>
>
> On Sep 14, 2012, at 9:19 AM, Angela Zalucha wrote:
>
> I am less familiar with the AIM package, so I am sorry I cannot help
> further.
>
>  Angela
>
>
>
> _-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-
> Angela Zalucha, Ph.D.
> A. M. Zalucha Consulting
>
> Office located at Southwest Research Institute
> 1050 Walnut Street, Suite 300
> Boulder, CO 80302
> USA
> (720) 208-7211
>
>
> http://www.boulder.swri.edu/~angela/
> _-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-
>
> On Fri, 14 Sep 2012, taimaz.bahadory wrote:
>
> Thanks for reply Angela;I'm currently using the AIM package. Isn't there
> any similar add-on for it?
>
> Obliquity, eccentricity, and precession are all three types of Earth's
> movement/rotation variations over a long period of
>
> time (as you may know)
>
> Anyway, I will take a look at the Fizhi package is AIM doesn't support
> this phenomena
>
> Thanks again
>
> On Fri, Sep 14, 2012 at 1:33 PM, Angela Zalucha <angela at boulder.swri.edu>
> wrote:
>
>      Taimaz:
>
>
>      If you are using the fizhi package,
>
>      subroutine ASTRO in fizhi_clockstuff.F will calculate the solar
> zenith angle as a function of obliquity and
>
>      eccentricity (these constants are set in getcon.F).  But note that
> they are treated as constants, so you
>
>      would need to modify the code if they are changing with time (I
> assume that's what you mean by precession).
>
>
>      I also have a subroutine to calculate solar zenith angle as a
> function of obliquity, eccentricity, and
>
>      ecliptic longitude as part of my planetary model (not part of the
> public distribution).  The equation for
>
>      solar zenith angle may be found in e.g. Peixoto and Oort, "Physics of
> Climate" textbook.
>
>
>      Angela
>
>
>      _-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-
>
>      Angela Zalucha, Ph.D.
>
>      A. M. Zalucha Consulting
>
>
>      Office located at Southwest Research Institute
>
>      1050 Walnut Street, Suite 300
>
>      Boulder, CO 80302
>
>      USA
>
>      (720) 208-7211
>
>
>      http://www.boulder.swri.edu/~angela/
>
>      _-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-
>
>
>      On Fri, 14 Sep 2012, taimaz.bahadory wrote:
>
>
>            Hello everybody;
>
>            Does MITgcm support orbital parameters, such as obliquity,
> precession, and eccentricity? I want
>
>            to run a climate model
>
>            for, say thousands of years, in which the orbital
> specifications of Earth will change indeed. Is
>
>            MITgcm a suitable
>
>            package for such a case?
>
>            Thanks
>
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>
> ---------------------------------------------
> Brian E. J. Rose, PhD
> NOAA Climate and Global Change Postdoctoral Fellow
> Department of Atmospheric Sciences
> University of Washington
>
> office:  ATG 318   phone:  (206) 543-4596
> email:  brose at atmos.washington.edu
> web:  http://www.atmos.washington.edu/~brose
> ---------------------------------------------
>
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