046.doc
EXTREME SOUTHERN
ALTIMETERS
OCEAN
TIDE
MODELING
USING
RADAR
C.K. Shum1, Yuchan Yi1, Ole Andersen2, Per Knudsen2
1
Laboratory for Space Geodesy and Remote Sensing Research, Department of Civil and
Environmental Engineering and Geodetic Science, The Ohio State University, 2070 Neil
Avenue, Columbus, Ohio 43210-1275, USA. Tel: 614-292-7118; Fax: 614-292-2957;
Emails: ckshum@osu.edu; yi.3@osu.edu
2
Kort- og Matrikelstyrelsen DK-2400, Copenhagen NV, Denmark, oa@kms.dk;
pk@kms.dk
Predictability of barotropic ocean tides is significantly less accurate in the coastal regions,
littoral and shallow seas, and oceans not covered by TOPEX/POSEIDON, than in the
deep ocean (>1000 m depth) and within 660 latitude. Barotropic ocean tide models
(mostly with spatial resolutions at 50 km or longer), benefited primarily from
TOPEX/POSEIDON altimetry and hydrodynamic modeling, allow predictions of deep
ocean tidal amplitudes with an estimated accuracy of 1-2 cm (1). Even with the
availability of most recent suite of available global tide models based primarily on
TOPEX/POSEIDON data, e.g., GOT00, NAO99, Delft, FES00, extreme southern ocean
tides (-600 latitude South pole-ward) are limited both in accuracy and resolutions,
especially in regions near Antarctica, seasonally or permanently sea-ice-covered oceans.
In our initial study with the objectives to improve tides in Antarctica oceans for accurate
prediction of ground-line locations to enhance ice mass balance studies, we provide an
assessment of accuracy of tide models in the region. In addition to global models,
regional models such as the Padman models (Weddell Sea and Ross Sea) are currently
available. A test model (-500 latitude South pole-ward) using available over-ocean data
from TOPEX/POSEIDON, ERS-1/2, GEOSAT, GFO, and possibly JASON and
ENVISAT, and over available sea-ice altimeter data from ERS, GFO, and ENVISAT,
will be presented. The results will be discussed toward the objective of using combined
altimeter and InSAR data to develop a fine-resolution tide model in a test region over the
Sulzberger Ice Shelf, Ross Sea (-77.50 latitude, 1500 East Longitude).
Oral or Poster Presentation
Oceanography