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Ocean tides in the Weddell Sea: New observations on the Filchner-Ronne and Larsen C ice shelves and model validation

Citation

King, MA and Padman, L and Nicholls, K and Clarke, PJ and Gudmundsson, GH and Kulessa, B and Shepherd, A, Ocean tides in the Weddell Sea: New observations on the Filchner-Ronne and Larsen C ice shelves and model validation, Journal of Geophysical Research C: Oceans, 116, (6) Article C06006. ISSN 0148-0227 (2011) [Refereed Article]

DOI: doi:10.1029/2011JC006949

Abstract

Ocean tides under the large Weddell Sea ice shelves are among the least well observed on Earth. Here we present new, spatially extensive observations of the vertical tidal motion of the Filchner-Ronne and Larsen C ice shelves using Global Positioning System (GPS) data spanning a few weeks to years. We pay particular attention to the major tidal constituents (M2, S2, O1, K1) as well as important GRACE aliasing periods (K2 and S1). We compare the estimated constituents with recent global and regional tide models and find that no single model is the most accurate across all constituents or ice shelves. The root-sum-square errors are 7-8 cm (CATS2008a and TPXO7.2) and 11-12 cm (GOT4.7 and FES2004) with the energetic M2 (RMSE = 4-8 cm) and S2 (4-5 cm) generally dominating these statistics. The FES2004 K1 is particularly inaccurate near the Larsen C Ice Shelf, with errors approaching 20 cm, meaning that GRACE Release 4 estimates of mass change in the northern Antarctic Peninsula will be biased. We find tidal energy at 3, 4, 5, 6 and, weakly, at 7 cycles per day at all of our sites. The largest amplitudes within these bands are at M4, MO3 and SP3 and approach 30 mm, although significant spatial variations exist. We show that they generally do not appear to originate in areas of reduced water column in ice shelf grounding zones. Comparing model estimates with our M4, MS4 and MN4 values shows that models do not accurately represent these terms. Copyright 2011 by the American Geophysical Union.

Item Details

Item Type:Refereed Article
Keywords:Aliasing; Antarctic Peninsula; Ice shelves; Mass change; Model estimates; Model validation; Ocean tides; Root-sum-square; Spatial variations; Tidal energy; Tidal motion; Water columns; Weddell Sea; Errors; Global positioning system; Sea ice; Tides
Research Division:Earth Sciences
Research Group:Physical Geography and Environmental Geoscience
Research Field:Physical Geography and Environmental Geoscience not elsewhere classified
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
Author:King, MA (Professor Matt King)
ID Code:82169
Year Published:2011
Web of Science® Times Cited:23
Deposited By:Geography and Environmental Studies
Deposited On:2013-01-17
Last Modified:2017-10-06
Downloads:0

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