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New determinations of tides on the north-western Ross Ice Shelf

Published online by Cambridge University Press:  14 October 2020

Richard D. Ray*
NASA Goddard Space Flight Center, Greenbelt, MD, USA
Kristine M. Larson
University of Colorado, Boulder, CO, USA
Bruce J. Haines
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA


New determinations of ocean tides are extracted from high-rate Global Positioning System (GPS) solutions at nine stations sitting on the Ross Ice Shelf. Five are multi-year time series. Three older time series are only 2–3 weeks long. These are not ideal, but they are still useful because they provide the only in situ tide observations in that sector of the ice shelf. The long tide-gauge observations from Scott Base and Cape Roberts are also reanalysed. They allow determination of some previously neglected tidal phenomena in this region, such as third-degree tides, and they provide context for analysis of the shorter datasets. The semidiurnal tides are small at all sites, yet M2 undergoes a clear seasonal cycle, which was first noted by Sir George Darwin while studying measurements from the Discovery expedition. Darwin saw a much larger modulation than we observe, and we consider possible explanations - instrumental or climatic - for this difference.

Physical Sciences
Copyright © Antarctic Science Ltd 2020

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