Changeset 5920b7f in flex_extract.git for For_developers/Sphinx/source/Documentation/vertco.rst
- Timestamp:
- May 30, 2020, 9:35:50 AM (4 years ago)
- Branches:
- master, ctbto, dev
- Children:
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- 550435b
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For_developers/Sphinx/source/Documentation/vertco.rst
rf20342a r5920b7f 21 21 22 22 Calculation of the vertical velocity from the horizontal wind using the continuity equation 23 =================================================================================== 23 =========================================================================================== 24 24 25 25 The vertical velocity in the ECMWF's eta vertical coordinate system is computed by the Fortran program ``calc_etadot``, using the continuity equation and thereby ensuring mass-consistent 3D wind fields. A detailed description of ``calc_etadot`` can be found in the … … 42 42 43 43 Calculation of the vertical velocity from the pre-calculated MARS parameter 77 44 ====================================================================== 44 ============================================================================== 45 45 46 46 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 parameter 77 is available if the ``CONTROL`` parameter ``ETA`` is set to 1.
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