|Main page| FAQ's| Notes and Comments| References| Short loading course | OSO homepage
| RSS homepage
Notes of praise to this site
are rare. I comfort myself with the few that have arrived.
However, I'm grateful for the
plenty of acknowledgments that haven't passed unnoticed when I read
articles or attend conferences.
Thank you all.
Notes and comments to the ocean
tide loading provider
Thanks very much for making the changes, including the new tide models.
Concerning the ocean geocenter motion, you might be interested in this
feedback from John Ries:
I did a quick check and found that including the tidal geocenter
terms did produce a measurable reduction in the SLR residuals for
both Lageos-1 and Lageos-2...about 5-8 mm2 in variance. So I guess
it is doing some good.
I hope that we can update the future Conventions to be clear on which
techniques should/should not apply the geocenter offset.
Thanks again and best regards,
From: Matt King,
Department of Geomatics
University of Newcastle,
I hope the following comments are helpful.
Researchers should be careful using global tide models for
ocean loading parameters for the Antarctic continent and the
regions. This is because most of these models either totally
ice shelf regions or have insufficient bathymetric and
information. The lack of bathymetric data included in the
is due to
the difficulty in measuring bathymetry in the sub ice shelf
than a failure to include data in the model computations.
For example, the FES99 model is 90 degrees out of phase
significantly increased amplitude in the Amery Ice Shelf
(70E). This error was determined by comparing FES99 with in
In the case of the AIS region this is due to very little
information under the Amery Ice Shelf, including no
in the case
of the southern 200km. The coastline (grounding zone)
Amery Ice Shelf is also incorrect by 200km in this region in
For Antarctica it is recommend that a regional tidal model
extra data have been included and coastline definitions
are the Circum-Antarctic Tidal Simulation (CATS) and
Assimilation (CADA) models developed by Laurence Padman
L., H. A.
Fricker, R. Coleman, S. L. Howard, and L. Erofeeva, A new
the Antarctic ice shelves and seas, Ann. Glaciol., 34, in
As always, buyer beware!