Changeset 08c9091 in flex_extract.git for For_developers/Sphinx/Source/quick_start.rst
- Timestamp:
- Aug 12, 2020, 8:47:31 AM (4 years ago)
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- master, ctbto, dev
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For_developers/Sphinx/Source/quick_start.rst
r6931f61 r08c9091 428 428 Vertical velocity 429 429 The vertical velocity for ``FLEXPART`` is not directly available from MARS and has to be calculated. 430 There are several options for this, and the following parameters are responsible for the selection. 430 There are several options for this, and the following parameters are responsible for the selection. See :doc:`Documentation/vertco` for a detailed explanation. Using ``ETADIFF 1``, ``OMEGA 1`` and ``OMEGADIFF 1`` is recommended for debugging and testing only. 431 431 Usually, one has to decide between ``GAUSS 1`` and ``ETA 1``. ``GAUSS 1`` means that spectral fields of the horizontal wind fields and the divergence are retrieved and that the vertical velocity is calculate using the continuity equation. ``ETA 1`` means that horizontal wind fields etadot are retrieved on a regular lat-lon grid. It is recommended to use ``ETA 1`` where possible, as there is a substantial computational overhead for solving the continuity equation. 432 432 … … 445 445 The grid and domain parameters depends on each other. ``grid`` refers to the grid resolution. It can be given as decimal values (e.g., ``1.`` meaning 1.0°), or as in previous versions of flex_extract, as integer values refering to 1/1000 degrees (e.g., ``1000`` means also 1°). The code applies common sense to determine what format is to be assumed. 446 446 After selecting grid, the ``domain`` has to be defined. The extension in longitude or latitude direction must be an integer multiple of ``grid``. 447 448 447 448 449 449 The horizontal resolution for spectral fields is set by the parameter ``RESOL``. For information about how to select an appropriate value please read the explanation of the MARS keyword RESOL as found `in this entry of the ECMWF on-line documentation <https://confluence.ecmwf.int/display/UDOC/Post-processing+keywords#Post-processingkeywords-resol>`_ and `this table (also ECMWF documentation) <https://confluence.ecmwf.int/display/UDOC/Retrieve#Retrieve-Truncationbeforeinterpolation>`_. 450 450 … … 463 463 Flux data 464 464 Flux fields are always forecast fields and contain values of the fluxes accumulated since the start of the respective forecast. As certain re-analysis dataset cover all time steps with analysis fields, it was necessary to define a new parameter set for the definition of the flux fields. The following parameters are used specifically for flux fields. ``ACCTYPE`` is the field type (must be a type of forecast), ``ACCTIME`` the forecast starting time, and ``ACCMAXSTEP`` the maximum forecast step;``DTIME`` the temporal resolution. ACCTYPE is assumed to be the same during the whole period given by ACCTIME and ACCMAXSTEP. These values will be set automatically if not provided in a ``CONTROL`` file. 465 465 466 466 .. code-block:: bash 467 467 :caption: Example setting for the definition of flux fields.
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