[Atmosdyn] atmosdyn: weekly summary

[Ryan Love]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

Hey All,

You can grab a pdf of the text from here:
http://tinyurl.com/gp4utwj

or for the full URL:

https://www.dropbox.com/s/76h8dcgdnkm2p8b/introGeophysicalFluidDynamics_
Roisin_V1.pdf?dl=0

(note the line-break in the above)

Cheers,
Ryan

On 04/11/16 16:54, Andres, Heather wrote:
> Hi everyone.
> 
> Today we discussed Rossby waves as waves with potential vorticity
> as a restoring agent.  We looked at the assumptions required to
> obtain these solutions and their implications.
> 
> 1.  Dispersion relation depends on the wavenumber, so they do not
> travel as a wave packet, but split according to their wave number.
> 
> 2.  The background flow exactly balances the phase speed to
> produce standing waves with a wavenumber 3ish pattern in current
> mid-latitudes (i.e. U~30m/s)
> 
> 3.  Phase speeds tend to be easterly for low wave numbers and
> westerly for high wave numbers.  The group velocity is westerly in
> all cases.
> 
> Outstanding questions: 1.  What does it mean to have a non-zero
> group velocity for a standing wave? 2.  What determines the balance
> between the three potential vorticity terms when responding to a
> perturbation?  For example, for zonal flow over the Rockies, what
> determines how much of the correction is associated with changes to
> relative vorticity and changes to latitudinal position?
> 
> Next week, Taimaz will be presenting the Eliassen-Palm flux.  THis
> is a start to wave -mean flow interactions in Chapter 7.2 of
> Vallis.  An electronic version of Lev's preferred textbook,
> Cushman-Roisin, has been found.  Ryan, can you make that available
> to people?  We'll use that as a second place to work from in our
> future discussions.  It's less mathematical and more physical.
> 
> Heather
> 
> -- ******************************************************** Dr.
> Heather Andres Post-doctoral Research Fellow Physics and Physical
> Oceanography Memorial University of Newfoundland St. John's,
> CANADA (709)864-8846 
> *********************************************************
> 
> 
> _______________________________________________ Atmosdyn mailing
> list Atmosdyn at terra.physics.mun.ca 
> http://terra.physics.mun.ca/mailman/listinfo/atmosdyn
> 
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2

iQEqBAEBCAAUBQJYHOOyDRxybG92ZUBtdW4uY2EACgkQKslYxnMUFztoEAf+KZdQ
YTTUPxBuRDPj7Cg6rvVTYxi1xI2jSBx0SjuK1ShZYWsy30Zu2IxCumcUdzo6qP5t
0Vr4ua6EP++yiRX1eAO1ivYckWfHIgSnRS2RCYJObhJTS9dP4MZ3BvM5KOP3g/Qw
/3by6cCck67R44hIPPBizgTHYihaDMHwv5kql/DLTfDIHcPXdDuwalTR1aaRvBhx
X4xCq5/xziBdHHJa3zouZ1yYGtPWHbsfVGKymBwebF3LabSL0Ik9UnA1+BxBNPUo
30gKoziVDH756BHEb+/20I6h2asQPqmRwqEhW3V8FaRqsuk+fEqRWZPV/r6fUDdM
4IAP4FDraXSBGnHzfg==
=zyBU
-----END PGP SIGNATURE-----