PCPI Co-leads: Julie Jones (University of Sheffield, UK; link to CliC) and Marylin Raphael (UCLA, USA; link to SPARC)

Theme 1: Improve knowledge and understanding of past polar climate variations (100+ years)
Co-leads: Sarah Gille (Scripps Institution of Oceanography, USA) and Julie Jones (University of Sheffield, UK)

Theme 2: Assess reanalyses in polar regions
Co-leads: Dave Bromwich (Ohio State University, USA) and Jim Renwick (Victoria University, New Zealand)

Theme 3: Improve understanding of polar predictability on seasonal to decadal timescales
Co-Leads: Ed Hawkins (University of Reading, UK) and John Fyfe (CCCma, Canada)

Theme 4: Assessing model performance in the polar regions
Co-leads: Hugues Goosse (Université catholique de Louvain, Belgium) and Jennifer Kay (National Center for Atmospheric Research, USA)

Theme 5: Model error
Co-leads: Gunilla Svensson (Stockholm University, Sweden) and Markus Jochum (University of Copenhagen, Denmark).

Theme 6: Improve understanding of how jets and non-zonal circulation couple to the rest of the system in the Southern Hemisphere
Co-leads: Marilyn Raphael (UCLA, USA) and Gareth Marshall (British Antarctic Survey, UK)