Changes in For_developers/Sphinx/Source/quick_start.rst [08c9091:6931f61] in flex_extract.git
- File:
-
- 1 edited
Legend:
- Unmodified
- Added
- Removed
-
For_developers/Sphinx/Source/quick_start.rst
r08c9091 r6931f61 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. See :doc:`Documentation/vertco` for a detailed explanation. Using ``ETADIFF 1``, ``OMEGA 1`` and ``OMEGADIFF 1`` is recommended for debugging and testing only.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.
Note: See TracChangeset
for help on using the changeset viewer.