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CLIVARDay4Highlights from the CLIVAR Open Science Conference: 25.09.2016
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SPARC eNews Bulletin out now! 19.09.2016

The latest SPARC eNews bulletin includes an open call for SPARC Scientific Steering Group membership, information on the WCRP-SPARC Workshop: Challenges for Climate Science, details of the Summer School on Atmospheric Composition and Dynamics and much, much more.

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International WCRP/IOC Conference "Regional Sea Level Changes and Coastal Impacts" 13.09.2016

10-14 July 2017

New York, NY, USA

The WCRP, jointly with the Intergovernmental Oceanographic Commission of UNESCO (IOC), invites you to an international conference on sea level research that will address the existing challenges in describing and predicting regional sea level changes, and in quantifying the intrinsic uncertainties. For more see the conference flyer.


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Science Highlights

Artboard 1Vitart2016 Fig1xThe Sub-seasonal to Seasonal Prediction (S2S) Project Database 5.9.2016

Frédéric Vitart et al. 2016

A database containing sub-seasonal to seasonal forecasts from 11 operational centres is available to the research community and will help advance our understanding of the sub-seasonal to seasonal time range. For more see the full article in the Bulletin of the American Meteorological Society (Early Online Release) (OPEN ACCESS).

Observation and integrated Earth-system science: A roadmap for 2016–2025 31.08.2016

PIXABAYsatellite-67718 1280Adrian Simmons et al., 2016

A report in response to a request by the Committee on Space Research of the International Council for Science to prepare a roadmap on observation and integrated Earth-system science for the coming ten years. Its focus is on the combined use of observations and modelling to address the functioning, predictability and projected evolution of interacting components of the Earth system on timescales out to a century or so. For more see the full article in Advances in Space Research (Volume 57, Issue 10) (OPEN ACCESS).

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WCRP COordinated Regional Downscaling EXperiment (CORDEX): A diagnostic MIP for CMIP6 25.07.2016

Find out all about CORDEX!

CORDEX builds on a foundation of previous downscaling intercomparison projects to provide a common framework for downscaling activities around the world. Discussion paper now available in Geoscientific Model Developement Discussions (OPEN ACCESS).


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WMO Global Framework for Climate Services


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Future Earth Research for Global Sustainability



IOC Framework for Ocean Observing



WCRP Decadal Prediction


Overview & News | Cross-Cut Activity | CMIP5 Decadal Prediction | CLIVAR Activities | Research Programs | Publications


CMIP5 Decadal Prediction

The WCRP CMIP5 experimental protocol has been confrimed by the 12th Session of the JSC/CLIVAR Working Group on Coupled Modelling and is presented in the following document:

Taylor, K. E., R. J. Stouffer and G. A. Meehl, 2009: A Summary of the CMIP5 Experiment Design, http://www-pcmdi.llnl.gov/

In addition to the centennial climate change simulations, the CMIP5 experiment design has a near term component. The following figure, taken from Taylor et al. (2009) shows a summary of the near term experiments in greater detail. These are multi-model and multi-institutional experiments aimed at improving our understanding of the physical climate system and our ability to predict its evolution on timescales from seasons to decades.

There are two core near term experiments, one a set of 10 year hindcasts or predictions initialized from climate states in the years 1960, 1965, 1970, and every five years to 2005, with this last simulation representing the sole actual prediction beyond the present (i.e., beyond 2009). In these 10-year simulations, it will be possible to assess model skill in forecasting climate on time-scales when the initial climate state, particularly the ocean initial conditions, may exert some influence. The other core experiment extends the 10-year simulations initialized in 1960, 1980, and 2005 by an additional 20 years. Groups can participate in the near term experiments without running the climate simulations, provided they generate the short 20th century runs as controls. The complete list of near term experiments is provided in Table A of Taylor et al. (2009).

The external forcing prescribed for the experiments is based on the observational record for the past and adopts the mid-range RCP4.5 scenario for the future. The choice of future scenario is not critical since forcing differences are small on these relatively short timescales, although the treatment of tropospheric aerosols is a potential source of uncertainty as these may change rapidly. Since volcanic eruptions cannot be predicted their occurrence is also a source of uncertainty for decadal forecasts although once they have occurred their effects become part of the forcing. Past volcanic eruptions are to be included in the hindcast simulations , which may partially over-estimate skill because of this. The error associated with future eruptions can in any case only be partially quantified from the impact of past eruptions in the hindcasts, since the error depends on the characteristics of each eruption. The experiment protocol includes a tier-1 suite of sensitivity experiments on the effect of including or not a Pinatubo-like eruption.

CMIP-WGCM-WGSIP Decadal Climate Prediction Panel (DCPP)

A CMIP-WGCM-WGSIP subgroup has been formed to oversee the CMIP5 decadal predition framework.


G. Boer

Canadian Centre for Climate Modelling & Analysis, Canada

B. Kirtman

Rosenstiel School of Marine and Atmos. Sciences, Uni. of Miami and COLA, USA

G. Meehl

Climate and Global Dynamics Division, NCAR, USA

Francsisco Doblas-Reyes

IC3, Spain

Wolfgang Mueller

ZMAW, Germany

D. Smith

Hadley Centre, MetOffice, UK

S. Power

Bureau of Meteorology, Australia

K. Taylor


Kimoto Masahide

U. Tokyo, Japan

Christope Cassou


Gokhan Danabasoglu


For more information contact Anna Pirani.


Data and Bias Correction for Decadal Climate Predictions
CMIP-WGCM-WGSIP Decadal Climate Prediction Panel, International CLIVAR Project Office Publication Series 150, 5pp, 2011.




Last update: 12.06.2013 by Anna Pirani
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