Sea-air interactions affecting fjord stratification

Our project investigates the link between wind variability and variations in salinity and temperature in Store Lungegårdsvann, a bay connected to the Puddefjorden at Bergen. Over a three-week period, data were collected using CTD Seabird SBE37, SBE56 sensors, and a HOBO MX2302A for air temperature and humidity. Meteorological data, such as wind speed and direction, were retrieved from external sources. The study focuses on a four-day period, from March 6 to 10 2025, during which significant fluctuations in salinity and temperature were noted. The results indicate a significant correlation between salinity and water temperature, suggesting that wind-induced mixing plays an important role in fjord dynamics. Wind direction has an impact on salinity, with onshore winds increasing salinity and offshore winds decreasing it. The transition from stable to unstable periods is explained by a significant change in air and water temperature, leading to mixing in the water column. This study highlights the importance of integrating wind measurements when analyzing surface variability in fjord environments.