[MITgcm-support] MITgcm-support Digest, Vol 140, Issue 1

Mon Feb 2 23:07:49 EST 2015

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On Feb 1, 2015 10:47 PM, "marco reale" <reale.marco82 at gmail.com> wrote:

> Hi Matthew and Cristopher ,
>
> I developed at the beginning the vorticity balance for a simple domain , a
> square domain . I saw that applying the curl to moment budget in the first
> 500 m where , at least in my domain, the baroclinicity effect are
> negligible, the value of Z3 reconstructed using the the advection term
> (coming from the um_advec) , stretching (coming from um_Coriolis) , and
> diffusion coming from (Um_diss) fits very well with the output of the
> model.The only problem seems to be present with baroclinicity term that
> doesn’t look to derive from UM_Dphx-Dx.
>
> What do you think about?
>
> marco
>
>
>
> > Il giorno 01/feb/2015, alle ore 09:57, mitgcm-support-request at mitgcm.org
> ha scritto:
> >
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> > Today's Topics:
> >
> >   1. Re: MITgcm-support Digest, Vol 139, Issue 30 (marco reale)
> >   2. Re: MITgcm-support Digest, Vol 139, Issue 30 (Matthew Mazloff)
> >   3. Re: vorticity balance (Christopher Pitt Wolfe)
> >   4. Milankovitch cycles (Hadar Berman)
> >
> >
> > ----------------------------------------------------------------------
> >
> > Message: 1
> > Date: Sat, 31 Jan 2015 18:05:32 +0100
> > From: marco reale <reale.marco82 at gmail.com>
> > To: mitgcm-support at mitgcm.org
> > Subject: Re: [MITgcm-support] MITgcm-support Digest, Vol 139, Issue 30
> > Message-ID: <65677A7E-B902-4AA4-A545-B785B58AE007 at gmail.com>
> > Content-Type: text/plain; charset="us-ascii"
> >
> > Hi matt,
> >
> > thanks a lot for the suggestion : my method computes correctly the
> stretching, diffusion and advection term : the term from the gradient of
> Eta vanishes  . I have only some problems with baroclinicity term : Do you
> refer to it when you talk about to pressure term?
> >
> > cheers
> >
> > Marco
> >
> >
> >
> >> Il giorno 31/gen/2015, alle ore 18:00,
> mitgcm-support-request at mitgcm.org ha scritto:
> >>
> >> note that if you are using spherical coordinates the discretization
> will cause the pressure term to not vanish, so you need to account for tha
> >
> > -------------- next part --------------
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> >
> >
> > ------------------------------
> >
> > Message: 2
> > Date: Sat, 31 Jan 2015 09:50:11 -0800
> > From: Matthew Mazloff <mmazloff at ucsd.edu>
> > To: <mitgcm-support at mitgcm.org>
> > Subject: Re: [MITgcm-support] MITgcm-support Digest, Vol 139, Issue 30
> > Message-ID: <3B472044-6B8C-4DC5-881B-E5CEF40036B3 at ucsd.edu>
> > Content-Type: text/plain; charset="windows-1252"
> >
> > Hi Marco
> >
> > I don't know your setup, but if your term from Eta vanishes then I don't
> think my comment pertains to you.
> >
> > What I was referring to is the fact that in calculus
> > P_{xy} - P_{yx} = 0
> >
> > But when discretized such that DX is a function of y this will not equal
> to zero. This can be a lowest order term for coarse resolution spherical
> coordinate models.
> >
> > I have argued to myself that given the pressure solver method of the
> model, it makes sense to group this contribution into the stretching term.
> I tell myself that as resolution increases and DX goes to zero this error
> will be reduced, and W will be larger? I am very interested to hear other
> thoughts on how to attribute this term.
> >
> > Matt
> >
> >
> >
> > On Jan 31, 2015, at 9:05 AM, marco reale <reale.marco82 at gmail.com>
> wrote:
> >
> >> Hi matt,
> >>
> >> thanks a lot for the suggestion : my method computes correctly the
> stretching, diffusion and advection term : the term from the gradient of
> Eta vanishes  . I have only some problems with baroclinicity term : Do you
> refer to it when you talk about to pressure term?
> >>
> >> cheers
> >>
> >> Marco
> >>
> >>
> >>
> >>> Il giorno 31/gen/2015, alle ore 18:00,
> mitgcm-support-request at mitgcm.org ha scritto:
> >>>
> >>> note that if you are using spherical coordinates the discretization
> will cause the pressure term to not vanish, so you need to account for tha
> >>
> >> _______________________________________________
> >> MITgcm-support mailing list
> >> MITgcm-support at mitgcm.org
> >> http://mitgcm.org/mailman/listinfo/mitgcm-support
> >
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> >
> > ------------------------------
> >
> > Message: 3
> > Date: Sat, 31 Jan 2015 13:27:28 -0500
> > From: Christopher Pitt Wolfe <c.l.p.wolfe at icloud.com>
> > To: mitgcm-support at mitgcm.org
> > Subject: Re: [MITgcm-support] vorticity balance
> > Message-ID: <77631ED6-5898-4E2A-BE23-78835CFD8ECF at icloud.com>
> > Content-Type: text/plain; charset="utf-8"
> >
> > Matt & Marco:
> >
> > If either of you happen to have the finite difference form of the
> vorticity equation written out (either as a document or as code), I think a
> lot of people would be interested in seeing it. I?ve worked out of few
> terms on my own, but I usually give up when I get to the advection terms ?
> >
> > Cheers,
> > Christopher
> >
> >> On Jan 31, 2015, at 12:50 PM, Matthew Mazloff <mmazloff at ucsd.edu
> <mailto:mmazloff at ucsd.edu>> wrote:
> >>
> >> Hi Marco
> >>
> >> I don't know your setup, but if your term from Eta vanishes then I
> don't think my comment pertains to you.
> >>
> >> What I was referring to is the fact that in calculus
> >> P_{xy} - P_{yx} = 0
> >>
> >> But when discretized such that DX is a function of y this will not
> equal to zero. This can be a lowest order term for coarse resolution
> spherical coordinate models.
> >>
> >> I have argued to myself that given the pressure solver method of the
> model, it makes sense to group this contribution into the stretching term.
> I tell myself that as resolution increases and DX goes to zero this error
> will be reduced, and W will be larger? I am very interested to hear other
> thoughts on how to attribute this term.
> >>
> >> Matt
> >>
> >>
> >>
> >> On Jan 31, 2015, at 9:05 AM, marco reale <reale.marco82 at gmail.com
> <mailto:reale.marco82 at gmail.com>> wrote:
> >>
> >>> Hi matt,
> >>>
> >>> thanks a lot for the suggestion : my method computes correctly the
> stretching, diffusion and advection term : the term from the gradient of
> Eta vanishes  . I have only some problems with baroclinicity term : Do you
> refer to it when you talk about to pressure term?
> >>>
> >>> cheers
> >>>
> >>> Marco
> >>>
> >>>
> >>>
> >>>> Il giorno 31/gen/2015, alle ore 18:00,
> mitgcm-support-request at mitgcm.org <mailto:
> mitgcm-support-request at mitgcm.org> ha scritto:
> >>>>
> >>>> note that if you are using spherical coordinates the discretization
> will cause the pressure term to not vanish, so you need to account for tha
> >>>
> >>> _______________________________________________
> >>> MITgcm-support mailing list
> >>> MITgcm-support at mitgcm.org <mailto:MITgcm-support at mitgcm.org>
> >>> http://mitgcm.org/mailman/listinfo/mitgcm-support <
> http://mitgcm.org/mailman/listinfo/mitgcm-support>
> >>
> >> _______________________________________________
> >> MITgcm-support mailing list
> >> MITgcm-support at mitgcm.org <mailto:MITgcm-support at mitgcm.org>
> >> http://mitgcm.org/mailman/listinfo/mitgcm-support
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> >
> > ------------------------------
> >
> > Message: 4
> > Date: Sun, 1 Feb 2015 10:56:58 +0200
> > From: Hadar Berman <hadarberman at gmail.com>
> > To: mitgcm-support at mitgcm.org
> > Subject: [MITgcm-support] Milankovitch cycles
> > Message-ID: <494D28DC-2BFA-4DC5-9392-C64FEDB9B2B1 at gmail.com>
> > Content-Type: text/plain; charset=us-ascii
> >
> > Dear all,
> >
> > I am interested in running an ecological model for past climates. I was
> wandering if anyone has ever implemented Milankovitch cycles into the 3D
> model, and if so, is there any way to receive this code.
> >
> > Thanks in advance,
> > Hadar.
> >
> >
> > ------------------------------
> >
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> > MITgcm-support at mitgcm.org
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> >
> > End of MITgcm-support Digest, Vol 140, Issue 1
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>
>
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