visualization of a new generation of climate simulations with avizo green

Visualization of a new generation of climate

simulations with Avizo Green

Michael BöttingerDeutsches KlimarechenzentrumGerman Climate Computing Center

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Michael Böttinger, DKRZ


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DKRZ – who we are High Performance Computing Center National Service Facility for Climate- and Earth System

Research Limited (non for profit) Company (Shareholder: MPG: 53%,

University HH: 27%, AWI: 10%, HZG: 10%)


• IBM "Power6“: 264 Nodes • 8448 Cores• 158 TeraFlops (sustained)• System memory 20 TByte

• Infiniband Interconnect (4xDDR)

• 6 PByte GPFS file system

• Optimized for Climate Modeling

• >100 PByte Archive Capacity

Top500 (06/2009): Rank 27

High Performance Computing

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Top500 (09/2011): Rank 98


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The Climate System


Conservation Laws (Momentum, Energy, Mass) State Equations Radiation Boundary Conditions: i.e. Earth Geometry,

Astronomical Parameters, Distribution of Land and Sea

Differential Equations

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Atmosphere Model


Atmosphere Models

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... approximate solution: finite differences method

using a 3D-computational grid

Climate Models – Data Structures◦ Georefererenced data -> Mapping◦ Relatively coarse 3D grids, some quantities only 2D◦ Grids: rectilinear, curvilinear, rotated, irregular …◦ Multivariate / scalar and vector fields◦ Special values◦ Time axis: very long time series◦ Coupled models: distinct grids◦ Multi run experiments (ensembles)



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MomentumEnergyWater

Land Surface

Coupler

Sun Atmosphere

Ocean

concentrations(GHG, SO4)

Source: MPI-M

A coupled climate model


Scenarios forenergy production,

land use, etc.Emission scenarios

for CO2

and othergases/aeros.

Carbon Cycle ModelChange in the

concentration ofCO2 and other

gases/aeros.

Climate ModelClimate change(Temperature,

Precipitation,…)

IPCC AR4 / CMIP3

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?

Earth System Model


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Atmosphere

Vegetation / Land

Ocean: Physics Biogeochem.

Coupler

Simulations performed by DKRZ 2010/2011

Earth System Model MPI-ESM: land biosphere, ocean-

biogeochemistry (developed by MPI-M)

Computational demand: factor 60 compared to IPCC AR4

13 000 simulated model years

Results: 650 TB raw data, 60 TB in ESG

Simulations for CMIP5 / IPCC AR5


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Base experiments

◦ e.g. the recent history historical 1850 to 2005.

Projections (Scenarios)

◦ 2005 to 2100, and 2005 to 2300, 3 different scenarios

Decadal climate forecasts

Role of the carbon cycle with respect to climate change

Long history

◦ e.g. the time 850 to 1850 or the last glacial maximum

CMIP5 Experiments with MPI-ESM


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IPCC AR5 SimulationsIntroduction: RCP Scenarios

RCP = Representative Concentration Pathways

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IPCC AR5 SimulationsIntroduction: RCP Scenarios

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IPCC AR5 SimulationsProjected Temperature Changes

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IPCC AR5 SimulationsProjected Temperature Changes

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Ensemble Mean Temperature Change relative to 1986-2005


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Simulated Sea Ice Concentration for September (blue) and March (white)


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Simulated Sea Level Change (without possible contributions of land ice)


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Information and Data Access


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Earth System Grid

IS-ENES Data Access

http://www.dkrz.de/Klimaforschung/konsortial/ipp-ar5/

STORM is a consortium effort aiming at multi-century climate

change integrations with a high resolution climate model

Beyond IPCC AR5 simulations


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1/10 Deg MPI-OM


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Avizo with domain specific extensions, i.e.

NetCDF CF-1.0 Reader◦ supports regular, rectilinear, rotated, curvilinear and irregular grids◦ Long time series: streaming for time dependent data◦ Caching in memory

Map Projections◦ Cylindric Equidistant, Spherical, Mollweide etc.

„Earth“ Module◦ Textures, LOD techniques◦ Topography / Bathymetry◦ Continental and political Outlines

HW-based Bump Shading for 2D Slices Vector Vis Methods Volume Rendering for rectilinear grids


Avizo Green

High visual quality of the resulting imagery

(relatively) easy to use.

DKRZ contributions to Avizo Green:

◦ Avizo Green Tutorial (see http://www.dkrz.de/Nutzerportal-

en/doku/halo/sw/avizo/avizo)

◦ Enhanced modules, i.e. DKRZ-Earth, BumpSliceDOI (under development)

Next generation climate model: unstructured grid -> developed for

DKRZ, now included in Avizo7 (funded by DKRZ and MPI-M)

More stability needed

Scalability: Performance problems with large grids

Status and Challenges


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Merci!

[email protected]

http://www.dkrz.de

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MPI-ESM LR: T63L47/GR15L40

◦ Atmosphere: horizontally ~200 km, 47 height levels (up to 80 km

height)

◦ Ocean: variable resolution between 12 and 150 km, 40 depth levels

MPI-ESM MR: T63L95/TP04L40

◦ Atmosphere: horizontally ~200 km, 95 height levels (up to 80 km

height)

◦ Ocean: variable resolution at 0.4° (~40 km), 40 depth levels

Model Configurations


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visualization of a new generation of climate simulations with avizo green

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