nocturnal boundary layer problem simulations – in #9: CCLM

in #9: CCLM

<p> Dear Mikhail, </p> <p> I agree with your assumption. <br/> See also the paper <br/> Buzzi, Matteo; Rotach, Mathias W.; Holtslag, Matthias; Holtslag, Albert A.M. (2011): <br/> Evaluation of the <span class="caps"> COSMO </span> -SC turbulence scheme in a shear-driven stable boundary layer <br/> Meteorologische Zeitschrift Vol. 20 No. 3 (2011), p. 335 – 350, <span class="caps"> DOI </span> : 10.1127/0941-2948/2011/0050 </p> <p> Which model version are you using? What are the values of tuning parameters tkhmin and tkmmin? <br/> In older versions the minimum value for both parameters was 1., which was too high for nocturnal conditions (see the paper above). <br/> In more recent versions of the model you can choose smaller values. </p> <p> For more “expert” opinions, please contact Mathias Raschendorfer and/or Michael Baldauf from <span class="caps"> DWD </span> . </p> <p> Best regards </p> <p> Hans-Juergen </p>

  @hans-jürgenpanitz in #8466ee8

<p> Dear Mikhail, </p> <p> I agree with your assumption. <br/> See also the paper <br/> Buzzi, Matteo; Rotach, Mathias W.; Holtslag, Matthias; Holtslag, Albert A.M. (2011): <br/> Evaluation of the <span class="caps"> COSMO </span> -SC turbulence scheme in a shear-driven stable boundary layer <br/> Meteorologische Zeitschrift Vol. 20 No. 3 (2011), p. 335 – 350, <span class="caps"> DOI </span> : 10.1127/0941-2948/2011/0050 </p> <p> Which model version are you using? What are the values of tuning parameters tkhmin and tkmmin? <br/> In older versions the minimum value for both parameters was 1., which was too high for nocturnal conditions (see the paper above). <br/> In more recent versions of the model you can choose smaller values. </p> <p> For more “expert” opinions, please contact Mathias Raschendorfer and/or Michael Baldauf from <span class="caps"> DWD </span> . </p> <p> Best regards </p> <p> Hans-Juergen </p>
HP replied

Dear Mikhail,

I agree with your assumption.
See also the paper
Buzzi, Matteo; Rotach, Mathias W.; Holtslag, Matthias; Holtslag, Albert A.M. (2011):
Evaluation of the COSMO -SC turbulence scheme in a shear-driven stable boundary layer
Meteorologische Zeitschrift Vol. 20 No. 3 (2011), p. 335 – 350, DOI : 10.1127/0941-2948/2011/0050

Which model version are you using? What are the values of tuning parameters tkhmin and tkmmin?
In older versions the minimum value for both parameters was 1., which was too high for nocturnal conditions (see the paper above).
In more recent versions of the model you can choose smaller values.

For more “expert” opinions, please contact Mathias Raschendorfer and/or Michael Baldauf from DWD .

Best regards

Hans-Juergen

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