1. © Crown copyright Met Office Assessing microphysics schemes with the 1D Kinematic Driver (KiD) Reading meeting Ben Shipway 18th Nov 2009

2. © Crown copyright Met Office Acknowledgements Adrian Hill, Jonathan Wilkinson Hugh Morrison, Greg Thompson Brad Ferrier, Weiguo Wang Various other people working with the model.

3. © Crown copyright Met Office Segal’s Law: A man with a watch know what time it is. A man with two watches is never sure!

4. © Crown copyright Met Office KiD 1D driver code Kinematic Driver code written with a simple interface to a common dynamical core Developed to facilitate the testing of a range of microphysics schemes in a consistent way Several simple test cases are supplied to test a range of microphysical situations, e.g. deep convection, warm rain cumulus, drizzling stratocumulus, mixed-phase stratocumulus Examples of current applications Comparison between CRM and hi-resolution operational microphysics schemes – enables fast detailed analysis of process rates. GCSS SHEBA intercomparison case – provides initial analysis of proposed sensitivity tests. Also highlights any significant differences in the processes of the different schemes. Development of microphysics codes – enables extensive testing of schemes over a wide parameter space, highlighting sensitivities and also bugs.

5. Warm case © Crown copyright Met Office

6. Surface precip. for 50 cm -3

7. © Crown copyright Met Office kg m -2 s -1

8. © Crown copyright Met Office kg m -2 s -1

9. © Crown copyright Met Office UM and graupel Test cases: deep1

10. © Crown copyright Met Office

14. Contents MicrophysicsPeak graupel mixing ratio (x10 -3 kg/kg) LEM SM7.3 LEM DM6.5 Morrison10.2 Thompson11.2 UM Ice+Snow0.8 UM Snow0.8

15. © Crown copyright Met Office graupel processes not included in UM Deposition and sublimation of graupel The wet mode of graupel growth. Collection of ice crystals (only collection of aggregates is assumed) Freezing of rain

16. © Crown copyright Met Office

17. Same order of magnitude as LEM piacr_g. In UM this process produces more snow…

18. © Crown copyright Met Office SHEBA and ice processes Test cases: mixed1

19. Mixed-phase supercooled sc © Crown copyright Met Office

20. UCLA-LARCLEM WSM6UM

21. © Crown copyright Met Office 1D model: mixed1 UCLA-LARC LEM Modifying Morrison ice autoconversion scheme to not depend upon humidity and turning off droplet sedimentation can bring the two schemes into better agreement

22. Evaluation against observations Sheba (GCSS) Wave clouds Lagrangian descents (CONSTRAIN) © Crown copyright Met Office

23. Questions and answers