[ncl-talk] Using hyi2hyo to interpolate data from hybrid ERA-Interim to CAM4 L26

[Mao-Lin Shen]

Hi,


I interpolated data from hybrid ERA-Interim to CAM's hybrid level for
nudging.
But we found a big difference in between when we compared the data on
pressure level.

The results show in bellow.

Left panel is the results applying hyi2hyo to get temperature on CAM's
hybrid level first and then using vinth2p to get temperature on pressure
level.

Right panel shows the results interpolated from ERA-Interim by using
vinth2p.

Level       Temperature (Degree)    Temperature (Degree)
(850hPa)  294.0318218618177      292.5374525210495
(500hPa)  276.7536469179544      268.8364571841531
(250hPa)  256.9609800328714      233.3842838572815
(100hPa)  219.1232631977532      186.2120804720032

Horizontal resolution remains identical in this test.
The temperature are supposed to be identical, but it is not due to unclear
issue.
Does any one have similar problem?
Or has idea how to tackle this issue?
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