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INSTITUTE OF METEOROLOGY AND WATER MANAGEMENT

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Presentation on theme: "INSTITUTE OF METEOROLOGY AND WATER MANAGEMENT"— Presentation transcript:

1 INSTITUTE OF METEOROLOGY AND WATER MANAGEMENT
CENTRE OF NUMERICAL WEATHER FORECASTS TITLE : COLOBOC – TASK 7: PARAMETERIZATION OF LAND SURFACE HETEROGENEITY BY THE TILE/MOSAIC APPROACH AUTHOR: GRZEGORZ DUNIEC PRESENTED BY: PIOTR DRZEWIECKI DATE:

2 Status at IMWM after 2 months work
Initial Validation of SUBS was done for ver. 4.8 of COSMO MODEL The influence of SUBS on model results for different parameterisation of physics and numerics was estimated.

3 Setup chosen for tests Numerical schemes
Leapfrog: 3 – timelevel HE-VI Integration Leapfrog: 3 – timelevel semi – implicit Runge – Kutta: 2 – timelevel HE – VI Integration with irunge kutta=1 Runge – Kutta: 2 – timelevel HE – VI Integration with irunge kutta=2 Convection schemes Tiedtke (1989) Kain – Fritsch (1992)

4 Setup chosen for tests (cntd.)
Orig – original COSMO ver. 4.8 Ctrl – control (subs modified COSMO ver 4.8 with no account for subs) Twins – subs modified COSMO ver. 4.8 with nsubs=4, low resolution input data only Subs – modified COSMO ver. 4.8, nsubs=4, high – resolution data included

5 Output fields for test Soil – soil temperature at 0 cm down (surface temp.) Te2m – air temperature at 2m above groud level Wate – water+ice content of soil layers 1cm down U10m – zonal wind component, 10m above ground level V10m – meridional wind component, 10m above ground level

6 Methodology Comparison orig vs ctrl orig vs subs orig vs twins
(for all combinations of convection and numerical schemes) orig vs ctrl orig vs subs orig vs twins twins vs subs Statistics (for all combinations of convection and numerical schemes) BIAS Absolute BIAS correlation standard deviation covariance variance

7 Numerical schemes used for tests
leapdef - Leapfrog: 3 – timelevel HE-VI Integration leapsemi - Leapfrog: 3 – timelevel semi – implicit rungekutta1 - Runge – Kutta: 2 – timelevel HE – VI Integration with irunge kutta=1 rungekutta2 - Runge – Kutta: 2 – timelevel HE – VI Integration with irunge kutta=2

8 For all cases tests were performed for 1. 08
For all cases tests were performed for , 12:00 UTC model run and output fields for were taken from 15:00 UTC (i.e. 3rd hour of forecast)

9 Test domain: 51 x 51, 7km grid

10 Preliminary results for surface temp.
ORIG VS.SUBS correlation standard deviation variance Covariance leapdef 0,99 3,03 9,16 8,84 Leapdef_1 0,97 2,37 9,31 9,04 leapsemi 0,96 3,07 9,45 9,02 leapsemi_1 3,10 9,58 9,22 rungekutta1 0,26 10,04 100,74 6,67 rungekutta1_1 3 8,98 8,97 rungekutta2 0,25 10,03 100,78 6,65 rungekutta2_1 0,98 8,76

11 Other examples

12 THE ”WORST” CONFIGURATIONS rungekutta1. orig vs. subs

13 Soil temperature at 0 cm down (surface temp.)
DIFFERENCE BETWEEN ORIG AND SUBS (K) CORRELATION: 0,26

14 Air temperature at 2m above ground
DIFFERENCE BETWEEN ORIG AND SUBS (K) CORRELATION: 0,58

15 Zonal wind component, 10 m above ground level
DIFFERENCE BETWEEN ORG AND SUBS (m/s) CORRELATION: 0,41

16 Meridional wind component, 10 m above ground level
DIFFERENCE BETWEEN ORIG AND SUBS (m/s) CORRELATION: 0,23

17 Water + ice content of soil layers 1cm down
DIFFERENCE BETWEEN ORIG AND SUBS (kg/m2) CORRELATION: 0,16

18 THE ”WORST” CONFIGURATIONS rungekutta1. twins vs. subs

19 Soil temperature at 0 cm down (surface temp.)
DIFFERENCE BETWEEN TWINS AND SUBS (K) CORRELATION: 0,21

20 Air temperature at 2m above ground
DIFFERENCE BETWEEN TWINS AND SUBS (K) CORRELATION: 0,55

21 Zonal wind component, 10 m above ground level
DIFFERENCE BETWEEN TWINS AND SUBS (m/s) CORRELATION: 0,21

22 Meridional wind component, 10 m above ground level
DIFFERENCE BETWEEN TWINS AND SUBS (m/s) CORRELATION: 0,26

23 Water + ice content of soil layers 1cm down
DIFFERENCE BETWEEN TWINS AND SUBS (kg/m2) CORRELATION: 0,11

24 THE ”BEST” CONFIGURATION leapdef.twins vs. subs

25 Soil temperature at 0 cm down (surface temp.)
DIFFERENCE BETWEEN TWINS AND SUBS (K) CORRELATION: 0,99

26 Air temperature at 2m above ground
DIFFERENCE BETWEEN TWINS AND SUBS (K) CORRELATION: 0,99

27 Zonal wind component, 10 m above ground level
DIFFERENCE BETWEEN TWINS AND SUBS (m/s) CORRELATION: 0,99

28 Meridional wind component, 10 m above ground level
DIFFERENCE BETWEEN TWINS AND SUBS (m/s) CORRELATION: 0,99

29 Water + ice content of soil layers 1cm down
DIFFERENCE BETWEEN TWINS AND SUBS CORRELATION: 0,95

30 Conclusions Basic implementation and tests were done successfully for COSMO v. 4.0 and for v (this work is supposed to be usefull for future implementation of COSMO 4.9 ) More tests should and will be done for v. 4.8. Waiting for version 4.9 to implement subs scheme.

31 01-673 Warszawa, ul.: Podleśna 61 tel.: (+48 022) 56 94 131
THANKS FOR YOUR ATTENTION CONTACT: IMGW Warszawa, ul.: Podleśna 61 tel.: ( )

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