Challenge the future

DelftUniversity ofTechnology

Clouds and ComputingHarm Jonker

Department GeoScience and Remote Sensing

Clouds in Weather and Climate

• Hydrological cycle

• Radiation balance

Landsat 65km LES 10km

~mm ~100m~1µm-100µm

Earth 107 m

Landsat 5 satellite picture65km; resolution 30m

~ 100km LES 10km

~mm ~100m~1µm-100µm

Earth 107 m

~ 100km LES 10km

~mm ~100m~1µm-100µm

Earth 107 m

DALES: Dutch Atmospheric Large Eddy SimulationTUD, KNMI, WUR, IMAU, ...

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

GCM-scale

cloud-scale

large scale forcings. parameterised-warmer sea,-subsidence

GCM-scale

cloud-scale

cloud response

Schalkwijk, Jonker, Siebesma, JAS 2013 (under review)

subsidence:(large scale circulation)

Cloud Response (in these particular settings)

EUCLIPSE project

subsidence:(large scale circulation)

Schalkwijk, Jonker, Siebesma, JAS 2013 (under review)

Cloud Response (in these particular settings)

GCM-scale

cloud-scale

large scale forcings. idealized

The KNMI TestbedEmbedded in a

Large-Scale Weather model

GALES

icw Neggers, Siebesma, v. Meijgaard

Cabauw

The KNMI TestbedPreliminary comparison with observations

0 12 24

Cloudcover

Average diurnal cycle over 22 ‘cumulus days’

Hour of day

30%

20%

10%

0%

Promising results for

cumulus days….

Observations

Simulated observations

Increasing the problem sizeMulti-GPU simulations

Satellite image

256 coupled GPUs (130 000 CUDA cores), 400x400x12km (40962x190 grid boxes)

GALES: MULTI-GPU PRACE: CURIE

courtesy: Jerome Schalkwijk

HD(CP)2: High Definition Clouds and Precipitationfor Climate Prediction

16 German institutes, 50 pd/PhDs

0.25 1 4 16 64 256 1024 4096 16384 655360.25

1

4

16

64

256

1024

4096

16384

65536

#GPUs

"spe

edup

"

Weak scaling properties

Oak Ridge5000x5000km

Curie409x409km

Curie204x204km

Perfect ScalingCURIEOak Ridge?

Dream on …. (we have the technology)

What if we just had the facilities …

Combine with Radiation calculations

courtesy Johan vd Dussen, Jerome Schalkwijk

Sustainable Energy Prediction and Management Tool

courtesy Stephan de Roode

accurate observations (remote sensing)e.g. Russchenberg et al.

e.g. Hanssen et al.

humidity fields from InSAR(100kmx100km)

High resolution Data Assimilation

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

geo-engineering