The response of the central Arctic Ocean stratification to freshwater perturbations
(English)Manuscript (preprint) (Other academic)
In this paper we have investigated how the central Arctic Ocean stratification responds to increasing or decreasing river runoff and precipitation. Using a state-of-the-art coupled ice-ocean circulation model we performed a number of sensitivity experiments which show a marked change both in the upper ocean salinity and the temperatures in the Atlantic water layer. A conceptual model of the Arctic Ocean is also introduced and compared
to the ocean circulation model. A key result from the conceptual model is a predicted shallowing of the halocline and the Atlantic water layer with an increased freshwater input, and vice versa. This is in agreement with the sen- sitivity experiments, however, the simulated changes in the Atlantic water layer temperature are not supported by the simple conceptual model. The changes in Atlantic water temperatures are particularly strong in the experiments with perturbed precipitation. We link these changes to a change in the upper ocean stability over the Barents Sea, induced by the freshwater input, leading to changes in temperature of the Atlantic water entering the central Arctic Ocean through St. Anna Trough.
Oceanography, Hydrology, Water Resources
Research subject Atmospheric Sciences and Oceanography
IdentifiersURN: urn:nbn:se:su:diva-107563OAI: oai:DiVA.org:su-107563DiVA: diva2:748449