Aarhus Universitets segl

A cost-efficient low-weight autonomous profiler for measurements in polar coastal waters and other regions with strong density gradients

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  • Lucas M. Sandby, Aarhus Universitet
  • ,
  • Jens E.B. Mejdahl, Aarhus Universitet
  • ,
  • Simon H. Bjerregaard, Aarhus Universitet
  • ,
  • Claus Melvad
  • Søren Rysgaard

The rapid warming of our planet has resulted in accelerated melting of ice in polar regions. Currently we have limited knowledge on how, where and when the surface meltwater layer is mixed with the underlying ocean due to lack of observations in these remote areas. We present a lightweight (17 kg) and low-cost (6000€) instrument for autonomous profiling across the strongly stratified upper layer in Arctic coastal waters, freshened by the riverine input and meltwater from glaciers, icebergs, and sea ice. The profiler uses a specially designed plunger buoyancy engine to displace up to 700 cm3 of water and allows for autonomous dives to 200 m depth. It can carry different sensor packages and convey its location by satellite communication. Two modes are available: (a) a free-floating mode and (b) a moored mode, where the instrument is anchored to the seafloor. In both modes, the profiler controls its velocity of 12 ± 0.3 cm/s resulting in 510 ± 22 data points per 100 m depth. Equipped with several sensors, e.g. conductivity, temperature, oxygen, and pressure, the autonomous profiler was successfully tested in a remote Northeast Greenlandic fjord. Data has been compared to traditional CTD instrument casts performed nearby.

Antal sider22
StatusUdgivet - okt. 2021

Bibliografisk note

Funding Information:
We gratefully acknowledge the contributions of Arctic Research Centre (ARC), Department of Biology and the Aarhus School of Engineering at Aarhus University. Aage V. Jensen Charity Foundation is acknowledged for financial support to access the field. The funding had no involvement in the study design; in the data collection, analysis and interpretation of data; in the writing of the report; and in the decision to submit the article for publication This work is a contribution to the Arctic Science Partnership (ASP). Furthermore, the workshop at Navitas ?Prototypev?rkstedet? has been of great help during both design, construction, and manufacturing.

Publisher Copyright:
© 2021 The Author(s)

Copyright 2021 Elsevier B.V., All rights reserved.

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