CORDEX – An international climate downscaling initiative.
In Chan, F., Marinova, D. and Anderssen, R.S. (eds) MODSIM2011, 19th International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, December 2011, pp. 2705-2711. ISBN: 978-0-9872143-1-7.
The World Climate Research Programme (WCRP) is backing an international initiative called the
COordinated Regional climate Downscaling EXperiment (CORDEX). The goal of the initiative is to provide
regionally downscaled climate projections for most land regions of the globe, as a compliment to the global
climate model projections performed within the fifth Coupled Model Intercomparison Project (CMIP5).
CORDEX includes data from both dynamical and statistical downscaling. It is anticipated that the CORDEX
dataset will provide a link to the impacts and adaptation community through its better resolution and regional
focus. Participation in CORDEX is open and any researchers performing climate downscaling are encourage
to engage with the initiative.
The model evaluation framework consists of RCM simulations performed using the European Centre for
Medium-Range Weather Forecasts (ECMWF) ERA-Interim re-analysis (Uppala et al., 2008) as “perfect
boundary conditions”. These simulations will be evaluated through a set of regional benchmark statistics,
against regional datasets, that are designed and assembled by regional diagnostic teams. The climate
projection framework within CORDEX is based on the set of new GCM simulations currently underway in
support of the IPCC fifth Assessment Report, referred to as CMIP5. CORDEX will focus on the GCM
experiments using emission scenarios known as RCP4.5 and RCP8.5 which represent a mid and a high-level
emission scenario. Ideally CORDEX simulations will span 1951 to 2100 though given the computational
demand of such long transient runs a series of 30 year time slices is also possible. Each RCM should perform
these simulations for multiple GCMs.
While CORDEX is focused on using CMIP5 simulations for boundary conditions, which are still being
created by the GCM groups, NARCliM uses the same AustralAsia and south-east Australia domains to
downscale CMIP3 simulations. One of the unique aspects of both the CORDEX and NARCliM databases
will be the presence of many three hourly fields. This will allow investigations of the simulation of diurnal
cycles in RCM ensembles that have not been previously possible.
Figure 2: CORDEX AustralAsia domain and topography. The red rectangle outlines the high resolution
south-east Australia sub-domain.
This page is maintaind by Jason Evans |
Last updated 31st January 2013