Frank Selten, Xueli WangWilco Hazeleger, Rein Haarsma,

Henk van den Brink,Pier Siebesma, Geert Lenderink, Peter van Velthoven,

Alwin Haklander, Camiel Severijns

Experiments and sensitivity runs

10-year integrations at ECMWF

• Hindcasts with observed SSTs.

• Climatological SSTs

- present climate

- future climate (with future CO2 concentr.)

• Sensitivity experiments:

- Cloud parameterizations

- Land model parameterizations

Computational costs10 year run CY31R1 T95L40 = 5.500 SBU

• Budget of EC-Earth group at KNMI: 1.200.000: 218 runs• Additional budgets by means of special projects

PrepIFS

XCdp

Too warm Mediterranean summer temperatures.

This is known from RACMO limited area model which is forced by ERA-40 boundaries and has the same physics as IFS model.

T2m temperatures in this area are sensitive to vegetation stress

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Soil moisture

T2m 12 UTC August 1981

Effect of vegetation stress function in RACMO

Standard – New

Sensitivity for cloud parameters

• No lateral entrainment of thermals in dry convective boundary layer

• Increased top entrainment for stratocumulus

CMIP project

Effect of no lateral entrainment on precipitation

SSTs of future climate are computed from AR4 simulations (selected set). SRES-A1 scenario 2080-2089.

SSTs of control run are computed from ERA-40 data set

Summary

Model has significant statistical errors

Sensitivity runs to investigate origins of model errors. Results of RACMO are used to design these experiments.

First GHG experiments are performed

Oceaan model: OPA

Huidige ocean-only configuratie:

Resolutie: 1/4 graad tripolar grid met 46 lagen.Forcering: DFS3 (4 uurlijkse ERA40 T, q en wind, dagelijkse neerwaarste straling uit CORE, neerslag DRAKKAR set 3)

Duur (1958 t/m 2001): 2 maanden op 88 CPUs van SGI Altix 3500 + 2 CPUs voor genereren van hoge resolutie forcering files en conversievan de output naar NetCDF.

Optionele koppeling met PISCES NPZD biogeochemie model

Hindcast data 1958-2001 beschikbaar voor gebruikers

Vanaf mei 2007 grove resolutie OPA gekoppeld aan ECMWF-IFS atmosfeer. (System 4)

Samengevat

• Model kent behoorlijke systematische fouten• Additionele specifieke simulaties en

diagnostiek: - verandering bodemdikte/stress-functie - vertikale menging PBL minder - te laag warmtetransport door golven in stratosfeer• Discussie via wiki pagina’s: ecearth.knmi.nl

Naast ‘tuning’ onderzoek

• Onderzoek naar wolken feedback in IFS in het kader van CFMIP: ‘cloud feedback intercomparison project’

• Onderzoek naar impact stochastische parameterisaties van niet-opgeloste schalen

Integrated Forecast System

• Suite of different models

• Coupled using OASIS

IFS atmospheric modelTessel land modelPrescribed SSTsPrescribed atmospheric chemical composition

Inclusion of ocean mixed layer model with Q-fluxFully coupled with OPA ocean model

Experiments until now:

Future experiments:

OASIS2

Atmosphere: IFS

Ocean: HOPE

Today: System 3

OASIS4

Atmosphere: IFS

Ocean: OPA

OASIS4

Atmosphere: IFS

Ocean: OPA

Sea-ice

Land: IFS H-tessel

Chemistry: TM5

Vegetation