The International CLIVAR Climate of the 20th Century Plus (C20C+) Project: Report of the Sixth Workshop

摘要

The International CLIVAR Climate of the 20th CenturyProject (C20C; Folland et al., 2002) held its Sixth Workshopon 5-8 November 2013 at the University of Melbourne,Australia. C20C brings together climate modelling and dataanalysis groups to study climate variations and changes overperiods up to the last 150 years using observational data andgeneral circulation models (GCMs). There is an emphasison atmospheric GCMs (AGCMs) forced with observedvalues of atmospheric composition (concentrations ofgreenhouse gases, aerosols, etc.) and surface conditions(SST, sea ice, land surface vegetation, etc.) as well as onnatural variations alone. As agreed at the fifth Workshopin Beijing in 2010 (Kinter and Folland, 2011), the new C20Ccore project involves research in collaboration with theInternational Detection and Attribution Group and theinternational Attribution of Climate-related Events activityinto the influence of anthropogenic forcing on climaticevents, particularly extreme climate events. This is partlyto support new research on quasi-operational attribution.The goal of the Sixth Workshop was to review early progressin the new core activity, observational data sets that willsupport C20C activities, and other key C20C projects. As inprevious C20C meetings, the forcing data sets being used ina new set of coordinated model experiments, including the more observations and attain greater accuracy andresolution. Titchner and Rayner (2014) describes the sea icecomponent. Key improvements of HadISST2 over HadISST1are multiple (100) realizations (though only a small subsetis likely to be used by C20C+), better resolution in time, newbias corrections to SST right up to the present, inclusion ofAATSR satellite data and a considerably improved sea iceextent data set. Talks on the complex process used to createthe SST and sea ice components of HadISST were presentedat the Workshop.