Hybrid_sigma_pressure_coordinate to Pressure level

[tanpv2000@yahoo_com]

Hi all,
Can anyone show me how to interpolate CAM output variables (such as T, U, V, H,...) from hybrid_sigma_pressure levels (e.g. eta or Ak, Bk) to standard pressure levels (e.g. 1000, 850,... hPa). I am facing with problems that PS (surface pressure) less than, for example, pressure at standard level that I want to interpolate to, like 1000 hPa. Can I extrapolate when PS < standard pressure?
Thanks
Tan

 

[strandwg]

Can anyone show me how to interpolate CAM output variables (such as T, U, V, H,...) from hybrid_sigma_pressure levels (e.g. eta or Ak, Bk) to standard pressure levels (e.g. 1000, 850,... hPa). I am facing with problems that PS (surface pressure) less than, for example, pressure at standard level that I want to interpolate to, like 1000 hPa. Can I extrapolate when PS < standard pressure?

NCL (http://www.ncl.ucar.edu) provides a number of built-in functions to do vertical interpolation of CAM fields to pressure levels.

 

[tanpv2000@yahoo_com]

Thank you. I found it.
Best wishes.
Tan