Special issue articles Technical note: Open-paleo-data implementation pilot – the PAGES 2k special issue 12448 Arctic hydroclimate variability during the last 2000 years: current understanding and research challenges 12426 Vegetation history and paleoclimate at Lake Dojran (FYROM/Greece) during the Late Glacial and Holocene 12420 300 years of hydrological records and societal responses to droughts and floods on the Pacific coast of Central America 12183 Climate variability in the subarctic area for the last 2 millennia 11995