[ncl-talk] time information in WGRIB2 and ncl

[Debasish Hazra]

Thanks Dennis. When I used ncl Verison 6.3 ncl_filedump shows :

Variable: f
Type: file
filename:       ngac.t00z.aod_550nm
path:   ngac.t00z.aod_550nm.grib2
   file global attributes:
   dimensions:
      lat_0 = 181
      lon_0 = 360
   variables:
      float AOTK_P48_L10_GLL0 ( lat_0, lon_0 )
         generating_process_type :      62000
         center :       US National Weather Service - NCEP (WMC)
         production_status :    Operational products
         long_name :    Aerosol optical thickness
         units :        Numeric
         _FillValue :   1e+20
         grid_type :    Latitude/longitude
         parameter_discipline_and_category :    Meteorological products,
Atmospheric chemical constituents
         parameter_template_discipline_category_number :        ( 48, 0,
20, 102 )
         level_type :   Entire Atmosphere
         level :         0
         forecast_time :        7
         forecast_time_units :  minutes
         initial_time : 11/13/2017 (00:00)

but when I used version 6.4 it shows forecast time as dimension :

Variable: f
Type: file
filename:       ngac.t00z.aod_550nm
path:   ngac.t00z.aod_550nm.grib2
   file global attributes:
   dimensions:
      forecast_time0 = 41
      lat_0 = 181
      lon_0 = 360
   variables:
      float AOTK_P48_L10_GLL0 ( forecast_time0, lat_0, lon_0 )
         generating_process_type :      62000
         center :       US National Weather Service - NCEP (WMC)
         production_status :    Operational products
         long_name :    Aerosol optical thickness
         units :        Numeric
         _FillValue :   1e+20
         grid_type :    Latitude/longitude
         parameter_discipline_and_category :    Meteorological products,
Atmospheric chemical constituents
         parameter_template_discipline_category_number :        ( 48, 0,
20, 102 )
         level_type :   Entire Atmosphere
         level :         0
         initial_time : 11/13/2017 (00:00)
         aerosol_type : 62000


Debasish.



On Tue, Nov 14, 2017 at 2:05 PM, Dennis Shea <shea at ucar.edu> wrote:

> NCL: 6.5.0 -14Nov2017_0149
>
> (available on yellowstone)
>
> Produced the attached dump.
>
> It has 5 variables
>
> float AOTK_P48_L10_GLL0_A62000
> float AOTK_P48_L10_GLL0_A62001
> float AOTK_P48_L10_GLL0_A62006
> float AOTK_P48_L10_GLL0_A62008
> float AOTK_P48_L10_GLL0_A62009
> float AOTK_P48_L10_GLL0_A62010
>
> On Tue, Nov 14, 2017 at 9:30 AM, Debasish Hazra <debasish.hazra5 at gmail.com
> > wrote:
>
>> Hi,
>>
>> I was trying to read forecast aerosol field using ncl and compare that
>> with WGRIB2 and could not figure out how forecast time can be used to plot
>> fields in different time steps. .I have uploaded the file in ftp
>> (ngac.t00z.aod.550nm.grib2)
>>
>> WGRIB2 of the file shows AOD of 5 species at every 3 hourly interval upto
>> 5days.
>> But ncl_filedump shows no time information of 5 species :
>>
>> AOTK_P48_L10_GLL0 ( lat_0, lon_0 ).
>>
>> Any help on this.
>>
>> Thanks.
>> Debasish
>>
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>
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