in Greenland   and Svalbard , as land-terminating glacial meltwater input increases stratification, which hinders vertical mixing and lowers local productivity, whereas marine-terminating glaciers can trigger upwelling, which supplies nutrients and enables higher productivity in the summer . Macroalgae and seagrass are generally expanding in the Arctic , though there are negative trends in some regions, partly due to increased runoff and turbidity from melting glaciers . In the future Arctic Ocean, higher light availability in response to further sea ice decline and reduced deep mixing is projected to generally increase primary productivity , leading to an increase in phytoplankton biomass from 2000 to 2100 by ~20% for SSP1-2.6 and ~30-40% for SSP5- 8.5  . However, productivity may increase less than predicted and eventually even decrease once nutrient limitation outweighs the benefits of higher light availability  .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report