当我将Grib2转换为Netcdf4时出现问题

Question

当我尝试从CFSR转换一些grib文件时遇到一些问题。 当我在unix shell中使用ncl_convert2nc时，nc文件信息如下所示：

 netcdf flxf01.gdas.197901 {
dimensions:
        ygrid_0 = UNLIMITED ; // (0 currently)
        lv_DBLL0 = 4 ;

variables:

// global attributes:
                :creation_date = "Sun Nov 12 11:29:36 AEDT 2017" ;
                :NCL_Version = "6.3.0" ;
                :system = "Linux charcoalp-Lenovo-Erazer-Y50-70 4.10.0-38-generic #42-Ubuntu SMP Tue Oct 10 13:24:27 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux" ;
                :Conventions = "None" ;
                :grib_source = "flxf01.gdas.197901.grb2" ;
                :title = "NCL: convert-GRIB-to-netCDF" ;
}

仅当我转换CFSR数据grib2文件时才会发生这种情况。

这是原始文件信息的一部分：

Nio file:   flxf01.gdas.197901.grb2
   global attributes:
   dimensions:
      lat_0 = 576
      lon_0 = 1152
      lv_DBLL0 = 4
   variables:
      float TMP_P8_L1_GGA0_avg744h [ lat_0, lon_0 ]
         center :   US National Weather Service - NCEP (WMC)
         production_status :    Operational products
         long_name :    Temperature
         units :    K
         _FillValue :   1e+20
         grid_type :    Gaussian latitude/longitude
         parameter_discipline_and_category :    Meteorological products, Temperature
         parameter_template_discipline_category_number :    [8, 0, 0, 0]
         level_type :   Ground or water surface
         level :    0
         type_of_statistical_processing :   Average
         statistical_process_duration : 744 hours (ending at forecast time)
         forecast_time :    745
         forecast_time_units :  hours
         initial_time : 01/01/1979 (00:00)
      float TMP_P8_L103_GGA0_avg744h [ lat_0, lon_0 ]
         center :   US National Weather Service - NCEP (WMC)
         production_status :    Operational products
         long_name :    Temperature
         units :    K
         _FillValue :   1e+20
         grid_type :    Gaussian latitude/longitude
         parameter_discipline_and_category :    Meteorological products, Temperature
         parameter_template_discipline_category_number :    [8, 0, 0, 0]
         level_type :   Specified height level above ground (m)
         level :    2
         type_of_statistical_processing :   Average
         statistical_process_duration : 744 hours (ending at forecast time)
         forecast_time :    745
         forecast_time_units :  hours
         initial_time : 01/01/1979 (00:00)

如您所见，它能够从grib文件中找到变量。 那么，为什么nc文件为空？ ncl_convert2nc适用于JRA-55重新分析数据集的Grib文件。 谁能帮我找到问题所在？

Answer 1

只是出于兴趣，您是否尝试过使用CDO？ 我认为命令是：

cdo -f nc4 copy in.grb out.nc