[ncl-talk] Editing global attributes of a NetCDF file in NCL

Wed Aug 26 10:18:29 MDT 2020

Hi

I need to make a small amendment in a global attribute of a WRF-related
netCDF file. This is a model "restart" file which stores crucial
information about the model setup and tells the model what datasets to
pick-up. For some reason, the latest WRF version has made a minor mistake
in writing the global attributes and this is causing errors, which I think
could be solved simply by editing one of the global attributes. I know of
NCL functions which copy entire metadata from one nc file to another but Is
there a way in NCL to edit these particular fields?

Here's what it looks like and I need to edit the line shown in red towards
the end:

// global attributes:
:TITLE = " OUTPUT FROM *             PROGRAM:WRF-Chem V4.1.3 MODEL" ;
:START_DATE = "2020-02-29_00:00:00" ;
:SIMULATION_START_DATE = "2020-02-29_00:00:00" ;
:FLAG_RESTART = 1 ;
:MAX_WRF_ALARMS = 55 ;
:WRF_ALARM_ISRINGING_01 = 1 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_01 = 3600 ;
:WRF_ALARM_ISRINGING_02 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_02 = 1700000000 ;
:WRF_ALARM_ISRINGING_03 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_03 = 1700000000 ;
:WRF_ALARM_ISRINGING_04 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_04 = 1700000000 ;
:WRF_ALARM_ISRINGING_05 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_05 = 1700000000 ;
:WRF_ALARM_ISRINGING_06 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_06 = 1700000000 ;
:WRF_ALARM_ISRINGING_07 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_07 = 1700000000 ;
:WRF_ALARM_ISRINGING_08 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_08 = 1700000000 ;
:WRF_ALARM_ISRINGING_09 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_09 = 1700000000 ;
:WRF_ALARM_ISRINGING_10 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_10 = 1700000000 ;
:WRF_ALARM_ISRINGING_11 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_11 = 1700000000 ;
:WRF_ALARM_ISRINGING_12 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_12 = 1700000000 ;
:WRF_ALARM_ISRINGING_13 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_13 = 1700000000 ;
:WRF_ALARM_ISRINGING_14 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_14 = 1700000000 ;
:WRF_ALARM_ISRINGING_15 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_15 = 1700000000 ;
:WRF_ALARM_ISRINGING_16 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_16 = 1700000000 ;
:WRF_ALARM_ISRINGING_17 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_17 = 1700000000 ;
:WRF_ALARM_ISRINGING_18 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_18 = 1700000000 ;
:WRF_ALARM_ISRINGING_19 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_19 = 1700000000 ;
:WRF_ALARM_ISRINGING_20 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_20 = 1700000000 ;
:WRF_ALARM_ISRINGING_21 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_21 = 1700000000 ;
:WRF_ALARM_ISRINGING_22 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_22 = 1700000000 ;
:WRF_ALARM_ISRINGING_23 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_23 = 1700000000 ;
:WRF_ALARM_ISRINGING_24 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_24 = 1700000000 ;
:WRF_ALARM_ISRINGING_25 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_25 = 1700000000 ;
:WRF_ALARM_ISRINGING_27 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_27 = 1700000000 ;
:WRF_ALARM_ISRINGING_28 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_28 = 1700000000 ;
:WRF_ALARM_ISRINGING_29 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_29 = 1700000000 ;
:WRF_ALARM_ISRINGING_30 = 1 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_30 = 21600 ;
:WRF_ALARM_ISRINGING_31 = 1 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_31 = 3600 ;
:WRF_ALARM_ISRINGING_32 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_32 = 1700000000 ;
:WRF_ALARM_ISRINGING_33 = 1 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_33 = 3600 ;
:WRF_ALARM_ISRINGING_34 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_34 = 1700000000 ;
:WRF_ALARM_ISRINGING_35 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_35 = 1700000000 ;
:WRF_ALARM_ISRINGING_36 = 1 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_36 = 21600 ;
:WRF_ALARM_ISRINGING_37 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_37 = 1700000000 ;
:WRF_ALARM_ISRINGING_38 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_38 = 1700000000 ;
:WRF_ALARM_ISRINGING_39 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_39 = 1700000000 ;
:WRF_ALARM_ISRINGING_40 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_40 = 1700000000 ;
:WRF_ALARM_ISRINGING_41 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_41 = 1700000000 ;
:WRF_ALARM_ISRINGING_42 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_42 = 1700000000 ;
:WRF_ALARM_ISRINGING_43 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_43 = 1700000000 ;
:WRF_ALARM_ISRINGING_44 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_44 = 1700000000 ;
:WRF_ALARM_ISRINGING_45 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_45 = 1700000000 ;
:WRF_ALARM_ISRINGING_46 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_46 = 1700000000 ;
:WRF_ALARM_ISRINGING_47 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_47 = 1700000000 ;
:WRF_ALARM_ISRINGING_48 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_48 = 1700000000 ;
:WRF_ALARM_ISRINGING_49 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_49 = 1700000000 ;
:WRF_ALARM_ISRINGING_50 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_50 = 1700000000 ;
:WRF_ALARM_ISRINGING_51 = 1 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_51 = 86400 ;
:WRF_ALARM_ISRINGING_53 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_53 = 1700000000 ;
:WRF_ALARM_ISRINGING_55 = 0 ;
:WRF_ALARM_SECS_TIL_NEXT_RING_55 = -1123200 ;
:WEST-EAST_GRID_DIMENSION = 100 ;
:SOUTH-NORTH_GRID_DIMENSION = 100 ;
:BOTTOM-TOP_GRID_DIMENSION = 41 ;
:DX = 1000.f ;
:DY = 1000.f ;
:AERCU_OPT = 0 ;
:AERCU_FCT = 1.f ;
:IDEAL_CASE = 0 ;
:DIFF_6TH_SLOPEOPT = 0 ;
:AUTO_LEVELS_OPT = 2 ;
:DIFF_6TH_THRESH = 0.1f ;
:DZBOT = 50.f ;
:DZSTRETCH_S = 1.3f ;
:DZSTRETCH_U = 1.1f ;
:GRIDTYPE = "C" ;
:DIFF_OPT = 1 ;
:KM_OPT = 4 ;
:DAMP_OPT = 3 ;
:DAMPCOEF = 0.2f ;
:KHDIF = 0.f ;
:KVDIF = 0.f ;
:MP_PHYSICS = 10 ;
:RA_LW_PHYSICS = 4 ;
:RA_SW_PHYSICS = 4 ;
:SF_SFCLAY_PHYSICS = 2 ;
:SF_SURFACE_PHYSICS = 2 ;
:BL_PBL_PHYSICS = 2 ;
:CU_PHYSICS = 0 ;
:SF_LAKE_PHYSICS = 0 ;
:SURFACE_INPUT_SOURCE = 1 ;
:SST_UPDATE = 1 ;
:GRID_FDDA = 1 ;
:GFDDA_INTERVAL_M = 360 ;
:GFDDA_END_H = 2400 ;
:GRID_SFDDA = 0 ;
:SGFDDA_INTERVAL_M = 0 ;
:SGFDDA_END_H = 0 ;
:HYPSOMETRIC_OPT = 2 ;
:USE_THETA_M = 1 ;
:GWD_OPT = 0 ;
:SF_URBAN_PHYSICS = 2 ;
:SF_SURFACE_MOSAIC = 0 ;
:SF_OCEAN_PHYSICS = 0 ;
:SIMULATION_INITIALIZATION_TYPE = "REAL-DATA CASE" ;
:WEST-EAST_PATCH_START_UNSTAG = 1 ;
:WEST-EAST_PATCH_END_UNSTAG = 99 ;
:WEST-EAST_PATCH_START_STAG = 1 ;
:WEST-EAST_PATCH_END_STAG = 100 ;
:SOUTH-NORTH_PATCH_START_UNSTAG = 1 ;
:SOUTH-NORTH_PATCH_END_UNSTAG = 99 ;
:SOUTH-NORTH_PATCH_START_STAG = 1 ;
:SOUTH-NORTH_PATCH_END_STAG = 100 ;
:BOTTOM-TOP_PATCH_START_UNSTAG = 1 ;
:BOTTOM-TOP_PATCH_END_UNSTAG = 40 ;
:BOTTOM-TOP_PATCH_START_STAG = 1 ;
:BOTTOM-TOP_PATCH_END_STAG = 41 ;
:GRID_ID = 3 ;
:PARENT_ID = 2 ;
:I_PARENT_START = 85 ;
:J_PARENT_START = 58 ;
:PARENT_GRID_RATIO = 3 ;
:DT = 5.f ;
:CEN_LAT = 53.37321f ;
:CEN_LON = -6.254578f ;
:TRUELAT1 = 53.3498f ;
:TRUELAT2 = 53.3498f ;
:MOAD_CEN_LAT = 54.5f ;
:STAND_LON = -6.2603f ;
:POLE_LAT = 90.f ;
:POLE_LON = 0.f ;
:GMT = 0.f ;
:JULYR = 2016 ;
:JULDAY = 320 ;
:MAP_PROJ = 1 ;
:MAP_PROJ_CHAR = "Lambert Conformal" ;
:MMINLU = "" ;
:NUM_LAND_CAT = 21 ;
:ISWATER = 16 ;
:ISLAKE = -1 ;
:ISICE = 24 ;
:ISURBAN = 1 ;
:ISOILWATER = 14 ;
:HYBRID_OPT = 2 ;
:ETAC = 0.2f ;

Any help would be much appreciated.

best regards,

Tabish

*Tabish U Ansari*

*Postdoctoral Researcher *

*Centre for Climate and Air Pollution Studies (C-CAPS)*
*School of Physics, NUI-Galway**, Ireland*
*ResearchGate <https://www.researchgate.net/profile/Tabish_Ansari> | Google
Scholar
<https://scholar.google.com/citations?user=E94r-mwAAAAJ&hl=en&oi=ao> |
Twitter <https://twitter.com/tabishbiet> | Github
<https://github.com/tabishumaransari/NCL-scripts>*
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