LAUSR

The Fram Strait is the main gateway for heat exchange between the Arctic Ocean and the Atlantic Ocean, hence estimating the heat transport is important to understand the on-going climate change. An acoustic system for acoustic thermometry was developed under the ACOBAR project. Results from this experiment showed that it was important to monitor the heat content in the north-going West-Spitzbergen current and the south-going East-Greenland current separately. Additionally, the complex oceanographic conditions in this region make it difficult to separate the different arrivals of the acoustic signals in the time domain. The UNDER-ICE experiment, funded by the Research Council of Norway, is the third acoustic thermometry experiment carried out by NERSC in the Fram Strait. Five moorings were deployed from 2014 to 2016, monitoring the north-going and the south-going currents separately. Transmissions were made every third hour for two years along 8 transects, and two moorings were augmented with additional oceanographic sensors. Results from the processing and analysis of the acoustic data are presented, including time series of the depth-range average temperature along the different transects. Oceanographic measurements and a comparison between acoustic observations and modeling results are also presented. The Fram Strait is the main gateway for heat exchange between the Arctic Ocean and the Atlantic Ocean, hence estimating the heat transport is important to understand the on-going climate change. An acoustic system for acoustic thermometry was developed under the ACOBAR project. Results from this experiment showed that it was important to monitor the heat content in the north-going West-Spitzbergen current and the south-going East-Greenland current separately. Additionally, the complex oceanographic conditions in this region make it difficult to separate the different arrivals of the acoustic signals in the time domain. The UNDER-ICE experiment, funded by the Research Council of Norway, is the third acoustic thermometry experiment carried out by NERSC in the Fram Strait. Five moorings were deployed from 2014 to 2016, monitoring the north-going and the south-going currents separately. Transmissions were made every third hour for two years along 8 transects, and two moorings were augmented with additional oc...