A Single Column Model version of HIRLAM Javier Calvo

Motivation The have a reference SCM version of HIRLAM for research and validation of model physics. –The idea is to maintain a code very close to the reference complete HIRLAM or even included within it. – Including different case studies to be used as reference cases. –Trying to gather as many users as possible within HIRLAM community.

Background Currently several SCMs are used by Hirlam researchers. –It’s difficult to maintain them updated with the reference model. –Comparisons are always uncertain due to the different set ups. Version most widely used is the one developed by B. Sass and previously used for the turbulence intercomparisons. –Complete model change significantly due to the inclusion of ISBA surface scheme (tile approach). –New cases coded for some versions from EUROCS cloud project.

The new Single Column Model Case set up and philosophy from B. Sass’s 1D model lifted to the new SCM. Dinamics follow quite closely the complete HIRLAM –SCM versions of some routines included. –3D structure of the arrays kept. This facilitates updates from the complete model. The SCM can be better used for debugging and optimization. Maybe the model could be extent to 2 point model or 2D model.

How to run the model Simple steering unix script –Makefile –Control through namelist –Output in ASCII format In principle plotting bu ‘gnuplot’ or ‘grads’ –Input data in ASCII format –Source versions based on RCS H1d/EXP/bin/Run1d,Plot Data/iniARM_Cu.dat Grdy1d phys

Calling tree: dynamics grdy1d : reads namelists : reads departure data : vertical interpolation to model levels : dynamical tendencies : prescribed tendecies if needed : Postprocesing and printinds

Calling tree Dinamics: grdy1dPhyscis: phys

Calling tree Physics: phys SLFLUXO+SURF NOPTION(4)=1 Prescribed or simple approaches Intercomparison of SCM, literature

Select physics routines with NOPTION() ISBA NOPTION(4)=2 CBR turbulence NOPTION(2)=2 Probably more options than in the complete HIRLAM

CBR turbulence Send diagnostics from physics to printing routine # i fdef H1D # endif PRINTDAT COM1D.inc -Deviation from the complete model physics trough directives ‘H1D’ -SCM physics shoud work without modications in the complete HIRLAM

STRACO NOPTION(2)=1 Clouds and Convection STRACO

CBR turbulence NOPTION(2)=2 KF/RK NOPTION(2)=4 Clouds and Convection KF/RK

SCM cases studies Dry boundary layer: 1.- Convective BL with some shear (case WC05 in Ayotte et al., BLM, 1996) 4.- Pure convective case with no wind (Ayotte, 1995) 5.- Lepzig case: thermally neutral and shear driven with strong winds 6.- Intermittent turbulence in a thermally stable BL layer (from SABLES) BL clouds: 2.- Sc case from GCSS case 3 (Duynkerke, 1998) 8.- Diurnal cycle of Sc over sea (EUROCS) 3.- Shallow Cu over sea from BOMEX (Siebesma and Holtslag, 1996) 7.- Diurnal cycle of Shallow Cu over land (ARM+EUROCS) Deep convection: 10.- Diurnal cycle of Deep Cu over land (ARM+GCSS 3a case) 9.- Diurnal cycle of Deep Cu over land (ARM+idealized case from EUROCS) 0.- Initialization and dynamical tendencies from the complete HIRLAM model. xx.- Sensitivity of Deep Cu to environmental humidity (idealized case from EUROCS) xx.- Long integration (at least 30 days) from TOGA COARE

To be done Coding of all case studies Inclusion of new physics schemes under development: –moist turbulence and statistical clouds (Sander volunteers) –Tiedtke convection with statistical clouds? Documentation of the SCM and the cases. Basic plotting tool? –Based on gnuplot/grads? Inclusion of observations and LES results for comparison.

Feedback Feedback and help is welcome to improve the SCM and to achieve a wide use of it.

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