Editoria: 1. The Ecosystem of Kongsfjorden, Svalbard.- PART I: Atmospheric conditions. 2. The atmosphere above Ny-Ålesund - Climate and global warming, ozone and surface UV radiation.- PART II: Oceanography, sea ice and underwater light regime. 3. The Kongsfjorden Transect: seasonal and inter-annual variability in hydrography.- 4. Changes in sea-ice extent and thickness in Kongsfjorden, Svalbard (2003-2016).- 5. Underwater light regime in Kongsfjorden and its ecological implications.- PART III: Pelagic production, phytoplankton and zooplankton. 6. Phytoplankton seasonal dynamics in Kongsfjorden, Svalbard and the adjacent shelf.- 7. Zooplankton in Kongsfjorden (1996-2016) in relation to climate change.- PART IV: Benthic microbes, macroalgae and fauna. 8. Living on cold substrata - new approaches to study microphytobenthos ecophysiology and ecology in Kongsfjorden.- 9. Biodiversity of benthic macro- and microalgaefrom Svalbard with special focus on Kongsfjorden.- 10. Kelp and environmental changes in the Kongsfjorden: Stress perception and responses.- 11. Ecological drivers of and responses by Arctic benthic communities, with an emphasis on Kongsfjorden, Svalbard.- PART V: Arctic fjord ecosystem model and autonomous marine observatories. 12. Outline of an Arctic fjord ecosystem model for Kongsfjorden-Krossfjorden, Svalbard.- 13. Autonomous marine observatories in Kongsfjorden, Svalbard.- PART VI: Kongsfjorden as harbinger of the future Arctic. 14. Kongsfjorden as harbinger of the future Arctic: knowns, unknowns and research priorities.