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Re: [ferret_users] geostrophic currents



HI,
You may should use dynamic_height.jnl that compute dynamic height and geostrophic current with T and S given.

yes? go dynamic_height.jnl
cancel mode verify ! defining dynamic height terms
*** INSTRUCTIONS:
1) Use LET to define three variables:
dyn_S - your salinity (PPT/1000 - 1)
dyn_T - your temperature (degrees C)
dyn_P - your pressure (millibars) (or depth in meters)
note: if you use "Z" for pressure use the G= syntax e.g. Z[G=TEMP]
so that FERRET knows which Z axis to use


2) Use the SET REGION command to specify the depth of zero motion
e.g. SET REGION/Z=0:1000 to set 1000 meters as the zero motion depth


3) Results will be available as the following LET variables:
Result XY plane XZ or YZ plane
--------- -------- --------------
Dynamic height (dynamic cm) DYN_HT DYN_HTz
Geostriphic velocity(cm/sec) GEO_U,GEO_V GEO_Uz,GEO_Vz

4) Examples: yes? CONTOUR/X=160e:160w/y=10s:10n DYN_HT <-- in the XY plane
or yes? CONTOUR/X=180/Y=10S:10n DYN_HTz <-- in the YZ plane
The difference in dynamic height between two depths (pressure levels)
may be expressed as e.g. z=500m to 1000m --> DYN_HT[Z=500:1000]

Xavier

golla nageswararao a écrit :

Hi all,
I had used the geostrophic currents jnl file in the mail archives and had plotted the geostrophic currents using default levitus climatology. But i am getting very high meridional component in the order of thousands. But i am getting zonal component in the order of 0.23 like that. I am plotting for indian ocean region. Why such high values are coming for meridional component ? Eventhough when i chang the datasets i am getting the same problem. why it is coming like that?
Please clear my doubt regarding this computation.
Thanks in advance.


/From,/

/G.Nageswara Rao,/
/Research Scholar,/
/INCOIS,/
/Jeeidmetla,/
/Hyderabad./

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