Exploring stochastic model uncertainty representations
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1 Exploring stochastic model uncertainty representations with relevance to the greyzone Sarah-Jane Lock, Martin Leutbecher, Peter Bechtold, Richard Forbes Research Department, ECMWF ECMWF November 15, 2017
2 Stochastic model uncertainty representations I: SPPT Net physics: T tendencies (K/3h), 0-3h, model level 64 Random pattern: r~n[0,0.55], time/spatial correlations (6 h/500 km) Unperturbed model e.g. member #1 X = 1 + r X Perturbed forecast 2
3 Stochastic model uncertainty representations I: SPPT Net physics: T tendencies (K/3h), 0-3h, model level 64 Random pattern: r~n[0,0.55], time/spatial correlations (6 h/500 km) Unperturbed model e.g. member #1 red, solid: 0<r<+1 blue, dash: -1<r<0 Ensemble standard deviation (20 perturbed members) 3
4 Stochastic model uncertainty representation II: SPPT (revised) Net physics minus clear-sky heating rates (radiation): T tendencies (K/3h), 0-3h, model level 64 Random pattern: r~n[0,0.55], time/spatial correlations (6 h/500 km) Unperturbed model X = X 1 + X 2 = 1 + r X 1 + X 2 Perturbed forecast e.g. member #1 red, solid: 0<r<+1 blue, dash: -1<r<0 4
5 Stochastic model uncertainty representation II: SPPT (revised) Net physics minus clear-sky heating rates (radiation): T tendencies (K/3h), 0-3h, model level 64 Random pattern: r~n[0,0.55], time/spatial correlations (6 h/500 km) Unperturbed model e.g. member #1 red, solid: 0<r<+1 blue, dash: -1<r<0 Ensemble standard deviation (20 perturbed members) 5
6 Stochastic model uncertainty representation II: SPPT (revised) Net physics minus clear-sky heating rates (radiation): T tendencies (K/3h), 0-3h, model level 64 Random pattern: r~n[0,0.55], time/spatial correlations (6 h/500 km) Unperturbed model SPPT: physics tendencies associated with deep convection generate much of the ensemble spread e.g. member #1 red, solid: 0<r<+1 blue, dash: -1<r<0 Ensemble standard deviation (20 perturbed members) + convective precip (ens mean) 6
7 Stochastic model uncertainty representation III: SPP Stochastically Perturbed Parametrisations (SPP) (Ollinaho et al., 2017, QJRMS) Quantities within parametrisation schemes are multiplied with noise from a 2D random pattern: r ˆ correlated in space (2000 km) and time (72 h). e.g. convection scheme parameters are perturbed with numbers drawn from distributions shown Currently: 20 independent perturbations of quantities in: boundary layer radiation large-scale precipitation and cloud convection 7
8 Stochastic model uncertainty representation III: SPP Turbulent diffusion & sub-grid orography (4) transfer coefficient for momentum coeff. in turb. orographic form drag scheme stdev of subgrid orography vertical mixing length scale (stable BL) Radiation (5) cloud vert. decorrelation height in McICA fractional stdev of horizontal distrib. of water content effective radius of cloud water and ice scale height of aerosol norm. vert. distrib. optical thickness of aerosol Convection (7) entrainment rate shallow entrainment rate detrainment rate for penetrative convection conversion coefficient cloud to rain conv. momentum transport (meridional/zonal) adjustment time scale in CAPE closure Large-scale precipitation & cloud (4) RH threshold for onset of stratiform cond. diffusion coeff. for evap. of turb. mixing critical cloud water content threshold for snow autoconversion 8
9 Diagnosing SPP impacts: model tendencies, T DYNAMICS Radiation T tendencies, accumulated 0-3h Zonally-averaged cross-sections Model levels: (>1 hpa) Contours: K/3h Vert diff/ogwd Convection Cloud TOTAL PHYSICS Control forecast (unperturbed model) 9
10 Diagnosing SPP impacts: model tendencies, T DYNAMICS Radiation (5) T tendencies, accumulated 0-3h Zonally-averaged cross-sections Model levels: (>1 hpa) Contours: K/3h Vert diff/ogwd (4) Convection (7) SPP (20): default Cloud (4) TOTAL PHYSICS Ensemble mean (20 members) 10
11 Diagnosing SPP impacts: model tendencies, T DYNAMICS Radiation (5) T tendencies, accumulated 0-3h Zonally-averaged cross-sections Model levels: (>1 hpa) Contours: K/3h Vert diff/ogwd (4) Convection (7) SPP (20): default Cloud (4) TOTAL PHYSICS Ensemble standard deviation (20 members) 11
12 Diagnosing SPP impacts: model tendencies, T DYNAMICS Radiation T tendencies, accumulated 0-3h Zonally-averaged cross-sections Model levels: (>1 hpa) Contours: K/3h Vert diff/ogwd Convection (7) Cloud TOTAL PHYSICS SPP (7): Convection deep entrainment rate shallow entrainment rate detrainment rate for penetrative convection conversion coefficient cloud to rain conv. momentum transport (meridional/zonal) adjustment time scale in CAPE closure Ensemble standard deviation (20 members) 12
13 Diagnosing SPP impacts: model tendencies, T DYNAMICS Radiation (5) T tendencies, accumulated 0-3h Zonally-averaged cross-sections Model levels: (>1 hpa) Contours: K/3h Vert diff/ogwd Convection Cloud TOTAL PHYSICS SPP (5): radiation cloud vert. decorrelation height, McICA fractional stdev of horizontal distrib. of water content effective radius of cloud water and ice scale height of aerosol norm. vert. distrib. optical thickness of aerosol Ensemble standard deviation (20 members) 13
14 Diagnosing SPP impacts: model tendencies, T DYNAMICS Radiation T tendencies, accumulated 0-3h Zonally-averaged cross-sections Model levels: (>1 hpa) Contours: K/3h Vert diff/ogwd (4) Convection Cloud + unstable BL? TOTAL PHYSICS SPP (4): BL schemes transfer coefficient for momentum coeff. in turb. orographic form drag scheme stdev of subgrid orography vertical mixing length scale (stable BL) Ensemble standard deviation (20 members) 14
15 Diagnosing SPP impacts: model tendencies, T DYNAMICS Radiation T tendencies, accumulated 0-3h Zonally-averaged cross-sections Model levels: (>1 hpa) Contours: K/3h Vert diff/ogwd Convection Cloud (4) TOTAL PHYSICS SPP (4): LSP/Cloud RH threshold for onset of stratiform condensation diffusion coeff. for evap. of turbulent mixing critical cloud water content threshold for snow autoconversion Ensemble standard deviation (20 members) 15
16 Diagnosing SPP impacts: model tendencies, T DYNAMICS Radiation T tendencies, accumulated 0-3h Zonally-averaged cross-sections Model levels: (>1 hpa) Contours: K/3h Vert diff/ogwd Convection SPP (4+2): LSP/Cloud + rain evaporation rate + snow sublimation rate Cloud (4+2) TOTAL PHYSICS Ensemble standard deviation (20 members) 16
17 Diagnosing SPP impacts: model tendencies, T DYNAMICS Radiation T tendencies, accumulated 0-3h Zonally-averaged cross-sections Model levels: (>1 hpa) Contours: K/3h Vert diff/ogwd Convection Cloud (4+2 / 4) TOTAL PHYSICS SPP (4+2): LSP/Cloud + rain evaporation rate + snow sublimation rate minus SPP (4): LSP/Cloud Ensemble standard deviation (20 members) 17
18 Diagnosing SPP impacts: model tendencies, T DYNAMICS Radiation T tendencies, accumulated 45-48h Zonally-averaged cross-sections Model levels: (>1 hpa) Contours: K/3h Vert diff/ogwd Convection Cloud (4+2 / 4) TOTAL PHYSICS SPP (4+2): LSP/Cloud + rain evaporation rate + snow sublimation rate minus SPP (4): LSP/Cloud Ensemble standard deviation (20 members) 18
19 Diagnosing SPP impacts: model tendencies, T DYNAMICS Radiation T tendencies, accumulated 0-3h Zonally-averaged cross-sections Model levels: (>1 hpa) Contours: K/3h Vert diff/ogwd Convection SPP (4+2): LSP/Cloud + rain evaporation rate + snow sublimation rate scope for further improvement Cloud (4+2) TOTAL PHYSICS + saturation adjustment? Ensemble standard deviation (20 members) 19
20 Diagnosing SPP impacts: model tendencies, T DYNAMICS Radiation T tendencies, accumulated 0-3h Zonally-averaged cross-sections Model levels: (>1 hpa) Contours: K/3h Vert diff/ogwd Convection SPP, deep convection param OFF Cloud TOTAL PHYSICS Ensemble mean (20 members) 20
21 Diagnosing SPP impacts: model tendencies, T DYNAMICS Radiation T tendencies, accumulated 0-3h Zonally-averaged cross-sections Model levels: (>1 hpa) Contours: K/3h Vert diff/ogwd Convection SPP, deep convection param OFF minus SPP Cloud TOTAL PHYSICS Ensemble mean (20 members) 21
22 Diagnosing SPP impacts: Aquaplanet temperature Wheeler-Kiladis diagrams: k-f spectrum of convectively coupled equatorial waves (CCEW) (symmetric component) Experiments: no land constant SSTs full IFS physics 13-month integrations 4 start dates 15N-15S Unperturbed model SPP 22
23 Diagnosing SPP impacts: Aquaplanet temperature Wheeler-Kiladis diagrams: k-f spectrum of convectively coupled equatorial waves (CCEW) (symmetric component) 15N-15S Unperturbed model SPP (500km/6h) SPP (500km/72h) SPP (5000km/168h) 23
24 Diagnosing SPP impacts: Aquaplanet temperature Wheeler-Kiladis diagrams: k-f spectrum of convectively coupled equatorial waves (CCEW) (symmetric component) 15N-15S Unperturbed model exclude Convection(7) perturbations SPP (500km/72h) SPP (20 7Conv) 24
25 relevance for the greyzone? SPPT: current stochastic model uncertainty representations very dependent on tendencies from the deep convection scheme SPP: greater control over attribution/representation of model uncertainty Potential to focus on processes aside from deep convection Assessing impacts on tendency budgets is useful diagnostic/development tool Indicate increasing importance of cloud/bl parametrisations and dynamics tendencies Aquaplanet experiments: Simplified environment for testing physics perturbations Highlight impact of correlation scales in the random patterns Possible route to cost-effective explicit convection experiments via small-planet? 25
26 Exploring stochastic model uncertainty representations with relevance to the greyzone Sarah-Jane Lock, Martin Leutbecher, Peter Bechtold, Richard Forbes Thank you for your attention! ECMWF November 15, 2017
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