143653 - Bathymetry-constrained navigation of Argo floats.pdf (1.99 MB)
Download fileBathymetry-constrained navigation of Argo floats under sea ice on the Antarctic Continental Shelf
journal contribution
posted on 2023-05-20, 22:19 authored by Wallace, LO, van Wijk, EM, Stephen Rintoul, Hally, BAntarctic 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 LettersVolume
47Issue
11Article number
e2020GL087019Number
e2020GL087019Pagination
1-9ISSN
0094-8276Department/School
Institute for Marine and Antarctic StudiesPublisher
Amer Geophysical UnionPlace of publication
2000 Florida Ave Nw, Washington, USA, Dc, 20009Rights statement
©2020. American Geophysical Union.Repository Status
- Open