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143653 - Bathymetry-constrained navigation of Argo floats.pdf (1.99 MB)

Bathymetry-constrained navigation of Argo floats under sea ice on the Antarctic Continental Shelf

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posted on 2023-05-20, 22:19 authored by Wallace, LO, van Wijk, EM, Stephen Rintoul, Hally, B
Antarctic continental shelf waters are poorly sampled, particularly beneath sea ice during winter. Profiling floats could help fill this gap, but floats are unable to surface to obtain a satellite position when ice is present. We deployed Argo profiling floats in a coastal polynya with a novel mission to rest on the sea floor between profiles. “Parking” on the seabed minimized the drift of the floats and allowed year‐round, full‐depth measurements over multiple winters. Measurements of water depth derived from the floats were used in combination with known bathymetry to constrain the position of profiles collected under ice. Errors were quantified by withholding known positions and comparing them to estimated positions; the bathymetrically constrained algorithm outperformed linear interpolation. A similar approach could potentially be used to geolocate other under‐ice oceanographic platforms that measure water depth.

History

Publication title

Geophysical Research Letters

Volume

47

Issue

11

Article number

e2020GL087019

Number

e2020GL087019

Pagination

1-9

ISSN

0094-8276

Department/School

Institute for Marine and Antarctic Studies

Publisher

Amer Geophysical Union

Place of publication

2000 Florida Ave Nw, Washington, USA, Dc, 20009

Rights statement

©2020. American Geophysical Union.

Repository Status

  • Open

Socio-economic Objectives

Antarctic and Southern Ocean ice dynamics

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