wrf_user_getvar
function wrf_user_getvar (nc_file, fld, it)
Usage: ter = wrf_user_getvar (a, “HGT”, 0)
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Get fields from a netCDF file for
1. Any given time by setting it to the time required.
2. For all times in the input file(s), by setting it = -1
3. A list of times from the input file(s), by setting it to (/start_time,end_time,interval/) ( e.g. (/0,10,2/) ).
4. A list of times from the input file(s), by setting it to the list required ( e.g. (/1,3,7,10/) ).
Any field available in the netCDF file can be extracted.
fld is case sensitive. The policy adapted during development was to set all diagnostic variables calculated by NCL to lower-case to distinguish them from fields directly available from the netCDF files.
List of available diagnostics:(也就是wrf_user_getvar这个函数可以⾃⼰计算以下这些诊断变量，⽽这些诊断变量在wrf模式⾥本⾝是没有的) avo: Absolute Vorticity [10-5 s-1]造纸产业发展政策
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eth: Equivalent PotentialTtemperature [K]
cape_2d: Returns 2D fields mcape/mcin/lcl/lfc
cape_3d: Returns 3D fields cape/cin
dbz: Reflectivity [dBZ]
mdbz: Maximum Reflectivity [dBZ]
geopt/geopotential: Full Model Geopotential [m2 s-2]
helicity: Storm Relative Helicity [m-2/s-2]
lat: Latitude (will return either XLAT or XLAT_M, depending on which is available)
lon: Longitude (will return either XLONG or XLONG_M, depending on which is available)
p/pres: Full Model Pressure [Pa]
pressure: Full Model Pressure [hPa]
pvo: Potential Vorticity [PVU]
pw: Precipitable Water
rh2: 2m Relative Humidity [%]
rh: Relative Humidity [%]
daas
slp: Sea Level Pressure [hPa]
ter: Model Terrain Height [m] (will return either HGT or HGT_M, depending on which is available)
td2: 2m Dew Point Temperature [C]
td: Dew Point Temperature [C]
tc: Temperature [C]
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tk: Temperature [K]
times: Times in file (note this return strings - recommended)
Times: Times in file (note this return characters)
updraft_helicity: Updraft Helicity [m-2/s-2]
ua: U component of wind on mass points
va: V component of wind on mass points
wa: W component of wind on mass points
uvmet10: 10m U and V components of wind rotated to earth coordinates
uvmet: U and V components of wind rotated to earth coordinates
z/height: Full Model Height [m]
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