Acoustic mapping of mixed layer depth Article Swipe

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Christian Stranne , Larry A. Mayer , Martin Jakobsson , Elizabeth Weidner , Kevin Jerram , Thomas C. Weber , Leif G. Anderson , Johan Nilsson , Göran Björk , Katarina Gårdfeldt ·

YOU? · · 2018 · Open Access · · DOI: https://doi.org/10.5194/os-2017-103

The ocean surface mixed layer is a nearly universal feature of the world oceans. The depth of the mixed layer (MLD) influences the exchange of heat and gases between the atmosphere and the ocean and constitutes one of the major factors controlling ocean primary production as it affects the vertical distribution of biological and chemical components in near-surface waters. Direct observations of the MLD are traditionally made by means of conductivity, temperature and depth (CTD) casts. However, CTD instrument deployment limits the observation of temporal and spatial variability of the MLD. Here, we present an alternative method where acoustic mapping of the MLD is done remotely by means of commercially available ship-mounted echosounders. The method is shown to be highly accurate when the MLD is well defined and biological scattering does not dominate the acoustic returns. These prerequisites are often met in the open ocean and it is shown that the method is successful in 95 % of data collected in the central Arctic Ocean. The primary advantages of acoustically mapping the MLD over CTD measurements are: (1) considerably higher temporal and horizontal resolutions and (2) potentially larger spatial coverage.

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Environmental Science

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CTD Mixed layer Environmental science Geology Atmosphere (unit) The arctic Remote sensing Arctic Feature (linguistics) Oceanography Layer (electronics) Meteorology Materials science Geography Philosophy Composite material Linguistics

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Type: preprint
Language: en
Landing Page: https://doi.org/10.5194/os-2017-103
PDF: https://doi.org/10.5194/os-2017-103
OA Status: gold
Cited By: 4
References: 56
Related Works: 10
OpenAlex ID: https://openalex.org/W4230623152

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DOI: https://doi.org/10.5194/os-2017-103

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Title: Acoustic mapping of mixed layer depth

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Type: preprint

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Language: en

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Publication year: 2018

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Publication date: 2018-01-30

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Authors: Christian Stranne, Larry A. Mayer, Martin Jakobsson, Elizabeth Weidner, Kevin Jerram, Thomas C. Weber, Leif G. Anderson, Johan Nilsson, Göran Björk, Katarina Gårdfeldt

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Landing page: https://doi.org/10.5194/os-2017-103

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Concepts: CTD, Mixed layer, Environmental science, Geology, Atmosphere (unit), The arctic, Remote sensing, Arctic, Feature (linguistics), Oceanography, Layer (electronics), Meteorology, Materials science, Geography, Philosophy, Composite material, Linguistics

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Cited by: 4

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Citations by year (recent): 2021: 1, 2020: 1, 2018: 2

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