10/04/2013 TU Delft Climate Institute Symposium: Do clouds change in a warming climate?

1. Challenge the future
Delft
University of
Technology
Clouds and Computing
Harm Jonker
Department GeoScience and Remote Sensing

2. Clouds in Weather and Climate
• Hydrological cycle
• Radiation balance

3. Landsat 65km LES 10km
~mm ~100m~1µm-100µm
Earth 107 m

4. Landsat 5 satellite picture
65km; resolution 30m

5. ~ 100km LES 10km
~mm ~100m~1µm-100µm
Earth 107 m

6. ~ 100km LES 10km
~mm ~100m~1µm-100µm
Earth 107 m
DALES: Dutch Atmospheric Large Eddy Simulation
TUD, KNMI, WUR, IMAU, ...

7. Local workflow!
Editing simulation
settings
Interaction
while simulating!
High-Performance
Simulations of
Turbulent Clouds on a
Desktop PC:
Exploiting the GPU
Schalkwijk, Griffith,
Post & Jonker
March 2012

8. GCM-scale
cloud-scale
large scale forcings.
parameterised
-warmer sea,
-subsidence

9. GCM-scale
cloud-scale
cloud response

10. Schalkwijk, Jonker, Siebesma, JAS 2013 (under review)
subsidence:
(large scale circulation)
Cloud Response
(in these particular settings)
EUCLIPSE project

11. subsidence:
(large scale circulation)
Schalkwijk, Jonker, Siebesma, JAS 2013 (under review)
Cloud Response
(in these particular settings)

12. GCM-scale
cloud-scale
large scale forcings.
idealized

13. The KNMI Testbed
Embedded in a
Large-Scale Weather model
GALES
icw Neggers, Siebesma, v. Meijgaard
Cabauw

16. The KNMI Testbed
Preliminary comparison with observations
0 12 24
Cloud
cover
Average diurnal cycle over 22 ‘cumulus days’
Hour of day
30%
20%
10%
0%
Promising
results for
cumulus
days….
Observations
Simulated
observations

17. Increasing the problem size
Multi-GPU simulations

18. Satellite image

19. 256 coupled GPUs (130 000 CUDA cores),
400x400x12km (40962x190 grid boxes)
GALES: MULTI-GPU PRACE: CURIE
courtesy: Jerome Schalkwijk

20. HD(CP)2: High Definition Clouds and Precipitation
for Climate Prediction
16 German institutes,
50 pd/PhDs

21. 0.25 1 4 16 64 256 1024 4096 16384 65536
0.25
1
4
16
64
256
1024
4096
16384
65536
#GPUs
"speedup"
Weak scaling properties
Oak Ridge
5000x5000km
Curie
409x409km
Curie
204x204km
Perfect Scaling
CURIE
Oak Ridge?
Dream on …. (we have the technology)
What if we just had the facilities …

22. Combine with Radiation calculations
courtesy Johan vd Dussen, Jerome Schalkwijk

23. Sustainable Energy Prediction and Management Tool
courtesy Stephan de Roode

24. accurate observations (remote sensing)
e.g. Russchenberg et al.
e.g. Hanssen et al.
humidity fields from InSAR
(100kmx100km)
High resolution Data Assimilation

25. Schalkwijk et al, BAMS 2012. Boing et al. JAS 2012

26. geo-engineering