[ncl-talk] Could there be a bug

[Jim Means]

Hi Dave,

If you use ncl_filedump to look at your data you will see this listed 
for sst:

       short sst ( time, latitude, longitude )
          long_name :    Sea surface temperature
          units :    K
          add_offset :    289.9202167899307
          scale_factor :    0.0006308732635179985
          _FillValue :    -32767
          missing_value :    -32767

Notice there is an offset and a scale factor in the data record for sst. 
I believe you will need to add the offset and multiply by the scale 
factor to get back to actual temperature in kelvins.

Good luck.

Jim


On 08/28/2018 07:33 AM, dave montgomery wrote:
> Dear NCL Users,
> I plotted sst on a local scale using NCL. The result for the sst 
> variable are way too high. Plotting the same data with CDO and using 
> ncview, the results for the sst variable are in the values to be 
> expected. In CDO, the variable sst has a range from 297.274K to 
> 300.189K but in NCL the plotted graph showed a range from about 12000 
> to 16000. Could our most esteem NCL experts help me out here? I would 
> be grateful for your help.
> Attached are the file, script and the corresponding plot.
> I am using NCL version 6.4.0
> Data is from ERA5
>
> Best regards
> Dave Montgomery
>
>
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James D. Means, Ph.D.
Senior Atmospheric & Climate Scientist
California Office
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