Fram Strait is the main gateway between the Arctic- and the Atlantic Ocean and is a region with complex oceanographic conditions. From 2014 to 2016, five acoustic moorings were deployed across the strait as a part of the UNDER-ICE project (funded by the Research Council of Norway). The main objective was to measure the heat-exchange through the Strait, based on average temperature measurements made using acoustic tomography. Transmissions were made every third hour along 7 different transects. The initial analysis of the results from the northernmost transect, a 180 km long transect from East to West at 80 N across the strait, showed that the 90 s long signal vanished during some time periods. Results from one of the sections across the Strait are presented, along with an analysis of the mooring motion, as well as the collected oceanographic data. The analysis indicates that the loss of the signal is caused by a combination of the pulldown of the acoustic source due to the currents, as well as the oceanographic conditions.

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