NOC Arctic Carbon Research Expedition Report No 87. 2025 MY Akula: Greenland fjords. 15th to 29th August 2025.

The purpose of the Greenland research cruise on board MY Akula was to investigate the interactions between DOC concentration and composition and the phytoplankton and bacterioplankton communities in Greenland fjords and coastal seas. The MY Akula cruise departed from Kulusuk-Tasilaq on the 15th August 2025 and arrived at Qaqortoq on 27th August 2025 when the science finished. Onboard there were two research scientists from the National Oceanography Centre, two members of Augmentum, and 14 crew members. The cruise consisted of the sampling of one fjord on the East coast of Greenland (Sermilik fjord) and two fjords on the Southwest coast of Greenland (Iterdlak and Tunulluarfjik fjords). Each station comprised a series of observations of water column properties (temperature, salinity, photosynthetic active radiation, fluorescence and coloured organic matter), nutrients, dissolved organic carbon and its fluorescence, chlorophyll biomass as an indicator of phytoplankton abundance, phytoplankton imaging and eDNA samples for eukaryote and prokaryote plankton composition.