Documentation of the Changes for COSMO-Model 4.14
and INT2LM 1.12

Before the operational start of the COSMO-EU with Runge-Kutta dynamics we had to build new binaries for the COSMO-Model and the INT2LM with the latest updates. For the INT2LM there are only some technical changes together with the possibility to switch the reference atmosphere. For the COSMO-Model there is a change in the microphysics, which affects the results of the COSMO-EU application. Also, there is one new Namelist Variable for the COSMO-Model.

Contents:

1. Changes for COSMO-Model 4.14
2. Changes for INT2LM 1.12

Changes for COSMO-Model 4.14

Changes in the microphysics
(by Axel Seifert)

In subroutine hydci_pp (used for itype_gscp=3) the density correction of the terminal fall velocity of raindrops and snowflakes is now taken into account. This leads to an increase of the sedimentation velocity in the atmosphere. The parameter zv0s which determines the actual empirical terminal fall velocity of snow at a reference density has been implemented as a new namelist variable v0snow. The special values for the different applications can be seen in the following table:

Changes in the nudging
(by Christoph Schraff)

Two bugs have been fixed in routine src_obs_proc_cdf:

• Bug fix to avoid model crash at processing of mobile TEMPs during COPS.
• Bug fix for writing correctly the aircraft flight phase to the ODR.

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Changes for INT2LM 1.12

Bug fix in routine coor_coarse_grid_lm for the option lec2lm (by Stephan Pfahls, ETH Zürich)

While introducing the decomposition independent computation of the interpolation weights, it was forgotten to take care of a non-staggered grid like the one from IFS. This has been corrected.

Possibility to switch the reference atmosphere (by Ulrich Schättler)

The possibility to switch the reference atmosphere from the incoming to the outgoing grid has been implemented in the module src_vert_inter_lm.f90:

The problem:

• If the incoming model delivers pressure or pressure deviation, the pressure deviation is used and interpolated to the outgoing grid. But this pressure deviation belongs to the incoming reference atmosphere.
• If the outgoing reference atmosphere is different, the following adaptation is done (Section 5 in routine org_vert_inter_lm):
  • Compute the incoming reference atmosphere on the outgoing vertical levels (Variable zp0_lm_refmod: the corresponding formulats from routine reference_atmosphere_x are used)
  • Compute the full pressure on the outgoing grid: p_lm = zp0_lm_refmod + pp_lm
  • Compute the pressure deviation for the outgoing reference_atmosphere pp_lm = p_lm - p0_lm

Vectorization of routine moist_split (by Oliver Fuhrer)

The routine moist_split has now been written for whole fields. Therefore no CALL within DO-loops is necessary and the calling routines do vectorize now.

Miscellaneous:

For the option lum2lm, the new reference atmosphere is now used in any case to compute the pressure deviation from full pressure, delivered by UKMO.

The new info-module is called after the domain decomposition only by compute processor 0.

Changes of results for INT2LM:

The options lgme2lm and llm2lm are not influenced by these changes.
For lec2lm, the bug fix in src_grids changes the results.
For lum2lm, the results are modified because of using the other reference atmosphere.

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