Changeset b1674ed in flex_extract.git for For_developers/Sphinx/source/Documentation/vertco.rst
- Timestamp:
- Apr 1, 2020, 5:03:13 PM (4 years ago)
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- master, ctbto, dev
- Children:
- d78851d, e0005c9
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- 50f9ca6
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For_developers/Sphinx/source/Documentation/vertco.rst
rba99230 rb1674ed 23 23 =================================================================================== 24 24 25 The vertical velocity is computed by the FORTRAN90 program `` CONVERT2`` in the ECMWF26 vertical coordinate system by applying the equation of continuity and thereby ensuring mass consistent 3D wind fields. A detailed description of `` CONVERT2`` can be found in the25 The vertical velocity is computed by the FORTRAN90 program ``calc_etadot`` in the ECMWF 26 vertical coordinate system by applying the equation of continuity and thereby ensuring mass consistent 3D wind fields. A detailed description of ``calc_etadot`` can be found in the 27 27 documents v20_update_protocol.pdf, V30_update_protocol.pdf and 28 V40_update_protocol.pdf. The computational demand and accuracy of `` CONVERT2`` is highly28 V40_update_protocol.pdf. The computational demand and accuracy of ``calc_etadot`` is highly 29 29 dependent on the specification of parameters ``GAUSS``, ``RESOL`` and ``SMOOTH``. The 30 30 following guidance can be given for choosing the right parameters: … … 45 45 ====================================================================== 46 46 47 Since November 2008, the parameter 77 (deta/dt) is stored in ``MARS`` on full model levels. ``FLEXTRA``/``FLEXPART`` in its current version requires ``deta/dt`` on model half levels, multiplied by ``dp/deta``. In ``flex_extract``, the program `` CONVERT2`` assumes that this parameter is available if the ``CONTROL`` parameter ``ETA`` is set to 1.47 Since November 2008, the parameter 77 (deta/dt) is stored in ``MARS`` on full model levels. ``FLEXTRA``/``FLEXPART`` in its current version requires ``deta/dt`` on model half levels, multiplied by ``dp/deta``. In ``flex_extract``, the program ``calc_etadot`` assumes that this parameter is available if the ``CONTROL`` parameter ``ETA`` is set to 1. 48 48 49 49 It is recommended to use the pre-calculated parameter 77 by setting ``ETA`` to 1 whenever possible.
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