Dr Rob Allan,ACRE Project Manager,

Climate Monitoring and Attribution Group,Met Office Hadley Centre,

Exeter, Devon,United Kingdom

The Atmospheric Circulation Reconstructions over the Earth (ACRE) initiative

QCCCEQCCCE

Three surface input only historical Three surface input only historical reanalyses generating 6-hourly 3D reanalyses generating 6-hourly 3D

atmospheric weather variablesatmospheric weather variables20th Century Reanalysis Project: 1892 to present

(supported in US by NOAA & DoE)

Surface Input Reanalysis for Climate Applications (SIRCA) (1840s-2011)

North Atlantic-European Region: 1750/1800 to present

EcologicalPhenological

Health & DiseaseReinsurance

Climate MonitoringModel Validation

Environmental AssessmentsExtremes, Impacts & Risks

Water resourcesAgricultural

ForestryEnergy

Marine operationsFisheries

Cultural landscapes & built heritage

QCCCEQCCCE

Climate applications &Climate applications &biophysical modelsbiophysical models

Global historical surface Global historical surface daily to sub-daily daily to sub-daily

weather observationsweather observations

and downscalingand downscaling

GCOS AOPC/OOPC GCOS AOPC/OOPC Surface Pressure Working Group Surface Pressure Working Group

International Surface Pressure Data BankInternational Surface Pressure Data Bank

NATIONALNATIONALMETEOROLOGICALMETEOROLOGICAL

SERVICESSERVICES(ECSN, ETCCDI, VACS, CMA,

MeteoFrance)

RREECCLLAA IIMM

NCDCNCDC

ATMOSPHERIC CIRCULATION ATMOSPHERIC CIRCULATION RECONSTRUCTIONSRECONSTRUCTIONSOVER THE EARTH OVER THE EARTH

ICOADSICOADS

GLOBEGLOBE

CDMPCDMP

TERRESTRIAL DATATERRESTRIAL DATA MARINE DATAMARINE DATA

HISTORICAL CLIMATE QUALITY REANALYSESHISTORICAL CLIMATE QUALITY REANALYSES

DATA DATA RESCUERESCUE(MEDARE

MedCLIVAR IEDRO SIGN)