Scalar diagnostic quantities¶
It is also possible to save time-series of certain scalar diagnostic quantities using a
combination of the options
-ts_vars. For example,
pismr -i foo.nc -y 1e4 -o output.nc \ -ts_file time-series.nc -ts_times 0:1:1e4 \ -ts_vars ice_volume_glacierized,ice_area_glacierized_grounded
will run for 10000 years, saving total ice volume and grounded ice area to
time-series.nc yearly. See tables Parameters below for the list of
options and Scalar time-series for the full list of supported time-series.
Similarly to the snapshot-saving code (section Snapshots of the model state), this mechanism does not affect adaptive time-stepping. Here, however, PISM will save exactly the number of time-series records requested.
-ts_vars makes PISM save all available variables listed in
Scalar time-series. Because scalar time-series take minimal storage space, compared to
spatially-varying data, this is usually a reasonable choice. Run PISM with the
-list_diagnostics option to see the list of all available time-series.
If the file
foo.nc, specified by
-ts_file foo.nc, already exists then by default
the existing file will be moved to
foo.nc~ and the new time series will go into
foo.nc. To append the time series onto the end of the existing file, use option
PISM buffers time-series data and writes it at the end of the run, once 10000 values are
stored, or when an
-extra_file is saved, whichever comes first. Sending an
USR2) signal to a PISM process flushes these buffers, making it possible to
monitor the run. (See section Signals, to control a running PISM model for more about PISM’s signal handling.)
append(false) If true, append to the scalar time series output file.
buffer_size(10000) Number of scalar diagnostic time-series records to hold in memory before writing to disk. (PISM writes this many time-series records to reduce I/O costs.) Send the USR2 signal to flush time-series.
filenameName of the file to save scalar time series to. Leave empty to disable reporting scalar time-series.
timesList or range of times defining reporting time intervals.
variablesRequested scalar (time-series) diagnostics. Leave empty to save all available diagnostics.