tinput-data.rst - pism - [fork] customized build of PISM, the parallel ice sheet model (tillflux branch)
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       ---
       tinput-data.rst (1779B)
       ---
            1 .. include:: ../../global.txt
            2 
            3 Input data
            4 ----------
            5 
            6 The NetCDF data used to initialize SeaRISE runs is `freely-available online
            7 <searise-greenland_>`_.
            8 
            9 To download the specific file we want, namely ``Greenland_5km_v1.1.nc``, and preprocess it
           10 for PISM, do:
           11 
           12 .. code-block:: none
           13 
           14    cd examples/std-greenland
           15    ./preprocess.sh
           16 
           17 The script ``preprocess.sh`` requires ``wget`` and also the `NetCDF Operators <NCO_>`_. It
           18 downloads the version 1.1 of the SeaRISE "master" present-day data set, which contains ice
           19 thickness and bedrock topography from BEDMAP :cite:`BamberLayberryGogenini`, and modeled
           20 precipitation and surface mass balance rates from RACMO :cite:`Ettemaetal2009`, among
           21 other fields.
           22 
           23 In particular, it creates three new NetCDF files which can be read by PISM. The
           24 spatially-varying fields, with adjusted metadata, go in ``pism_Greenland_5km_v1.1.nc``.
           25 The other two new files contain famous time-dependent paleo-climate records from ice and
           26 seabed cores: ``pism_dT.nc`` has the GRIP temperature record :cite:`JohnsenetalGRIP` and
           27 ``pism_dSL.nc`` has the SPECMAP sea level record :cite:`Imbrieetal1984`.
           28 
           29 Any of these NetCDF files can be viewed with ``ncview`` or other NetCDF visualization
           30 tools; see :numref:`tab-NetCDFview`. An application of IDV to the master data set produced
           31 :numref:`fig-sr-input`, for example. Use ``ncdump -h`` to see the metadata and history of
           32 the files.
           33 
           34 .. figure:: figures/sr-greenland-input.png
           35    :name: fig-sr-input
           36 
           37    The input file contains present-day ice thickness (left; m), bedrock elevation (center;
           38    m), and present-day precipitation (right; `m / year` ice equivalent) for
           39    SeaRISE-Greenland. These are fields :var:`thk`, :var:`topg`, and :var:`precipitation`,
           40    respectively, in ``pism_Greenland_5km_v1.1.nc``.