Replication Data for: Light and freshwater discharge drive the biogeochemistry and microbial ecology in a sub-Arctic fjord over the Polar night ...

• Main Authors: Klausen, Line, Vonnahme, Tobias R., Bank, Rose M., Michellod, Dolma, Dietrich, Ulrikke, Gradinger, Rolf
• Format: Dataset
• Language: unknown
• Published: DataverseNO 2022
• Subjects: Arctic; Northern Norway; polar night
• Online Access: https://dx.doi.org/10.18710/wg4y4j; https://dataverse.no/citation?persistentId=doi:10.18710/WG4Y4J

This dataset contains data files to the winter microbial ecology in a sub-Arctic fjord in northern Norway. The polar night has recently received increased attention as a surprisingly active biological season. Yet, polar night microbial ecology is a vastly understudied field. To identify the physical and biogeochemical parameters driving microbial activity over the dark season, we studied a sub-Arctic fjord system in northern Norway from autumn to early spring with detailed monthly sampling. We focused on the impact that mixing, terrestrial organic matter input and light have on the dynamics of the microbial ecosystem. Our study highlights strong seasonal differences in the key drivers during spring, autumn, and winter. The spring bloom starts while the water column is still fully mixed, opposing the traditional critical depth hypothesis. We identified incident solar radiation as the key driver for a spring bloom starting in March. However, it takes until April before the bloom reaches substantial chlorophyll ...