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- W3127383009 abstract "The Filchner-Ronne Ice Shelf (FRIS), fringing the southern Weddell Sea, plays a key role in theformation of Weddell Sea Deep and Bottom Water, which are precursors of world ocean’s AABW. Atpresent, a large continental shelf covered with cold and dense water protects FRIS from intense basalmelting. Model studies, however, have suggested the potential for enhanced flow of Modified WarmDeep Water (MWDW) toward and under FRIS via the Filchner Trough, causing a substantial increasein basal melt rates by the end of this century. Mooring time series spanning 2014 to 2016 at 76 ◦ Srevealed a distinct seasonal cycle in hydrography along the eastern flank of the Filchner Trough withwarm inflow occurring only during summer, while winter is dominated by a weakly stratified watercolumn at the surface freezing point. The seasonality is driven by seasonal evolution of the shelf breakthermocline in combination with local buoyancy forcing. The mooring time series was extended to2018 and while the general pattern of the described seasonal cycle is reaffirmed, an unprecedentedstrong warm inflow with temperatures being about 0.5 ◦ C above the previously observed inflow, wasobserved in 2017. Additionally, bottom temperatures above −1.5 ◦ C persisted throughout the wholewinter together with a fresh anomaly in salinity. A warm signal was also measured by a LoTUSbuoy deployed at 77 ◦ C during 2017. Weaker than average along-coast wind stress was present in theupstream region from summer through winter 2017 and likely lead to a stronger shoaling of the shelfbreak thermocline upstream of Brunt Shelf Ice causing the observed inflow. Likely, MWDW alsoentered the Brunt Ice Shelf cavity, which lead to enhanced basal melting that, in turn, could explainthe observed fresh water anomaly. The inflow event affected the continental shelf hydrography in afavourable way for an earlier onset of warm inflow in the following summer." @default.
- W3127383009 created "2021-02-15" @default.
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- W3127383009 date "2019-04-12" @default.
- W3127383009 modified "2023-09-27" @default.
- W3127383009 title "Unprecedented Strong Modified Warm Deep Water Flow towards Filchner Ronne Ice Shelf in 2017" @default.
- W3127383009 hasPublicationYear "2019" @default.
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