[ncl-talk] conform function changes values

[Ronald Opio]

Hello Dennis.

Please see the file attached herein. It has all file dimensions plus the
min and max of each variable.

Notice that the min and max change when the file is conformed.

On Thu, Jan 19, 2023 at 7:33 AM Dennis Shea <shea at ucar.edu> wrote:

> What are the dimensions of PS and T ?
>
>  printVarSummary (TS)
>  printVarSummary (PS)
>
> On Wed, Jan 18, 2023 at 3:13 AM Ronald Opio via ncl-talk <
> ncl-talk at mailman.ucar.edu> wrote:
>
>> Hello colleagues.
>>
>> I have used the NCL conform function to change the dimensions of a
>> surface temperature file. The "real" file has a resolution of 1-day while
>> the modified file (work-around) has a resolution of 6-hours. See the
>> file attached.
>>
>> I notice that the temperature profile has changed completely and yet I
>> expected that it would remain the same. Does anyone have any idea of how
>> this can be corrected?
>>
>> I have also attached the script I used FYI.
>>
>> Best,
>> Ronald.
>> _______________________________________________
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>
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 Copyright (C) 1995-2019 - All Rights Reserved
 University Corporation for Atmospheric Research
 NCAR Command Language Version 6.6.2
 The use of this software is governed by a License Agreement.
 See http://www.ncl.ucar.edu/ for more details.
(0)	opening files
(0)	reading in variables

Variable: TS
Type: float
Total Size: 538583040 bytes
            134645760 values
Number of Dimensions: 3
Dimensions and sizes:	[time | 7305] x [lat | 96] x [lon | 192]
Coordinates: 
            time: [60265.5..67569.5]
            lat: [-88.57216851400727..88.57216851400727]
            lon: [   0..358.125]
Number Of Attributes: 9
  standard_name :	surface_temperature
  long_name :	Surface Temperature
  comment :	Temperature of the lower boundary of the atmosphere
  units :	K
  cell_methods :	area: time: mean
  cell_measures :	area: areacella
  history :	2019-12-02T19:04:59Z altered by CMOR: replaced missing value flag (-9e+33) and corresponding data with standard missing value (1e+20). 2019-12-02T19:04:59Z altered by CMOR: Inverted axis: lat.
  missing_value :	1e+20
  _FillValue :	1e+20
(0)	Surface Temperature (K) : min=197.637   max=324.622
(0)	=============================================================================

Variable: PS
Type: float
Total Size: 2154332160 bytes
            538583040 values
Number of Dimensions: 3
Dimensions and sizes:	[time | 29220] x [lat | 96] x [lon | 192]
Coordinates: 
            time: [60265.25..67570]
            lat: [-88.57216851400727..88.57216851400727]
            lon: [   0..358.125]
Number Of Attributes: 10
  standard_name :	air_temperature
  long_name :	Near-Surface Air Temperature
  comment :	near-surface (usually, 2 meter) air temperature
  units :	K
  cell_methods :	area: mean time: point
  cell_measures :	area: areacella
  history :	2020-06-04T08:56:14Z altered by CMOR: Treated scalar dimension: 'height'. 2020-06-04T08:56:14Z altered by CMOR: replaced missing value flag (-9e+33) and corresponding data with standard missing value (1e+20). 2020-06-04T08:56:14Z altered by CMOR: Inverted axis: lat.
  coordinates :	height
  missing_value :	1e+20
  _FillValue :	1e+20
(0)	Near-Surface Air Temperature (K) : min=199.034   max=327.316
(0)	=============================================================================
(0)	conforming file
(0)	preparing final file

Variable: TS_6hr
Type: float
Total Size: 2154332160 bytes
            538583040 values
Number of Dimensions: 3
Dimensions and sizes:	[time | 29220] x [lat | 96] x [lon | 192]
Coordinates: 
            time: [60265.25..67570]
            lat: [-88.57216851400727..88.57216851400727]
            lon: [   0..358.125]
Number Of Attributes: 9
  missing_value :	1e+20
  history :	2019-12-02T19:04:59Z altered by CMOR: replaced missing value flag (-9e+33) and corresponding data with standard missing value (1e+20). 2019-12-02T19:04:59Z altered by CMOR: Inverted axis: lat.
  cell_measures :	area: areacella
  cell_methods :	area: time: mean
  units :	K
  comment :	Temperature of the lower boundary of the atmosphere
  long_name :	Surface Temperature
  standard_name :	surface_temperature
  _FillValue :	1e+20
(0)	Surface Temperature (K) : min=226.313   max=319.402