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Recipe File naming conventions
We want to understand the file naming conventions of G5NR products
The standard generic complete name for G5NR products appear as
c1440_NR.collection.timestamp.nc4
where
c1440_NR
the c1440 token indicates the resolution of the cubed-sphere grid. 14402 is the number of grid points in each face of the cubed-sphere. NR stands for Nature Run.
collection
The operational GEOS-5 data are organized into file collections that contain fields with common characteristics. However, computational considerations required that 3D collections have a single variable in them. Collection names are of the form
freq_dims_group_HV
where the four attributes (freq,dims,group,HV) are:
freq: time-independent (const), instantaneous (instF), time-average (tavgF), diurnally time-averaged (tdavF) where F indicates the frequency or averaging interval and can be one of the following:
30mn = every 30 minutes
01hr = hourly
01mo = monthly
The tdavF files typically contain monthly diurnal files, meaning, monthly means for each hour of the day: 0 UTC, 1 UTC, …, 23UTC.
dims: 2d for collections with only 2-dimensional fields or 3d for collections with a mix of 2- and 3-dimensional fields.
group: A short mnemonic for the type of fields in the collection, or the variable name for single-variable collections.
HV: Horizontal and Vertical grid, where
H can be:
N: Nominal (full) horizontal resolution of lat/lon grid.
C: Coarse (reduced) horizontal resolution of lat/lon grid
V can be:
x: horizontal-only data (surface, single level, etc.); dims must be 2D
p: pressure-level data (see Appendix B of spec file for levels TODO); dims must be 3D
v: model layer centers (see Appendix B of spec file TODO); dims must be 3D
e: model layer edges (see Appendix B of spec file); dims must be 3D
timestamp
This token defines the date and time associated with the data in the file. It has the form yyyymmdd_hhmmz, where
yyyy - year string (e.g. "2006")
mm - month string (e.g. "09" for September)
dd - day of the month string
hh - hour (UTC)
mm - minute
nc4: All files are in the NetCDF-4 format, hence the suffix ".nc4".