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Re: [ferret_users] HYCOM output in Z coordinates



Hi Jean and Ansley,

Simple interpolation is not a good way to convert from density
to z coordinate. If I remember correctly, HYCOM provides a
off-line program to do exactly what you are planning to do.
This program convert the coordinate conserving momemtum, mass,
heat and salt.

I am curious if this new routine "ZAXREPLACE_ZLEV" conserve
momentum, heat and salt.......

Sincerely,

Sang-ki

Hi Jean-
The HYCOM model has layer thicknesses rather than layer depths, which ZAXREPLACE uses. The layer thicknesses may vary with space and time.We've written a function function ZAXREPLACE_ZLEV to convert this data to a fixed Z axis:

yes? show function ZAXREPLACE_ZLEV

ZAXREPLACE_ZLEV(V,THICKNESS,ZAX)
regrid V onto Z axis of ZAX based on layer thickness
V: Variable on native z axis
THICKNESS: Thickness corresponding to input Z axis layers in units of output Z axis
ZAX: Variable with desired z (depth) axis points

Jean, this function will be in the next Ferret release. Or, if you let me know what platform you're running Ferret on, I could send you a shared object file with the function.

Ansley

jean oliveira wrote:

Hi friends,

I`m working with the HYCOM ocean model and I`d like to manage the temperature in Z coordinates. I dont know if a simple linear interpolation is the best method since a temperature represent a entire isopycnal layer. For example, suppose it has a isopycnal layer with thickness of 5 meters and temperature of 20ºC and the below isopycnal layer has a thickness of 20 meters and temperature of 18ºC and it wants to represent de temperature to each one meter. What I doing: I take the middle of the layer as the position of the temperature and then make the linear interpolation to eache meter. Mainly for those that use HYCOM and FERRET, is this the best way to represent the hycom`s output in Z coordinates? If not, how can I do a different method in the FERRET?


Thanks a lot for all


Jean



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--
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Dr. Sang-ki Lee
RSMAS/CIMAS
University of Miami
4600 Rickenbacker Causeway
Miami, FL 33149 USA
Tel) 305-361-4521
Fax) 305-361-4412
E-mail) sang-ki.lee@noaa.gov
Homepage) http://www.aoml.noaa.gov/phod/people/sklee.html
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Mailing-address:
Dr. Sang-ki Lee
AOML/PHOD
4301 Rickenbacker Causeway
Miami, FL, 33149 USA
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