Planktic Foraminiferal and Pteropod Contributions to Carbon Dynamics in the Arctic Ocean (North Svalbard Margin)

Planktic foraminifera and shelled pteropods are some of the major producers calcium carbonate (CaCO 3 ) in ocean. Their calcitic (foraminifera) aragonitic (pteropods) shells particularly sensitive to changes chemistry play an important role for inorganic organic carbon pump Here, we have studied abundance distribution planktic (individuals m –3 their contribution standing stocks (μg export production (mg –2 day –1 along a longitudinal transect north Svalbard at 81° N, 22–32° E, Arctic Ocean. This transect, sampled September 2018 consists seven stations covering different oceanographic regimes, from shelf slope into deep Nansen Basin. The sea surface temperature ranged between 1 5°C upper 300 m. Conditions were supersaturated with respect CaCO (Ω > both calcite aragonite). 2.3 52.6 ind 0.1 21.3 . foraminiferal population was composed mainly polar species Neogloboquadrina pachyderma (55.9%) subpolar Turborotalita quinqueloba (21.7%), incompta (13.5%) Globigerina bulloides (5.2%). pteropod dominated by Limacina helicina (99.6%). rather high is likely connected West Spitsbergen Current bringing warm Atlantic water study area. Pteropods subsurface. Below 100 depth, predominated. contribute 66–96% compared 4–34% foraminifera. together exceeds factor 3. overall predominance over this region during sampling period suggest that biogenic would be reduced under effects ocean acidification.