Our comparison of the GPS data to models
for glacial isostatic adjustment suggests that some parts of western coastal Greenland were experiencing accelerated melting of coastal ice by the late 1990s.
Konfal, S. A., Wilson, T. J., Bevis, M. G., Kendrick, E. C., Dalziel, I. W., Smalley, R., Willis, M. J., Heeszel, D. S., Wiens, D. A., (2013), GPS observations of
glacial isostatic adjustment into the Antarctic Interior, Abstract G43B - 0981 presented at 2013 Fall Meeting, AGU, San Francisco, Calif., 9 - 13 Dec..
Vertical land movements such as resulting
from glacial isostatic adjustment (GIA), tectonics, subsidence and sedimentation influence local sea level measurements but do not alter ocean water volume; nonetheless, they affect global mean sea level through their alteration of the shape and hence the volume of the ocean basins containing the water.
Additionally, unadjusted GRACE gravity data has suggested no lost ice mass and all estimates of ice gains or loss depend on
which Glacial Isostatic Adjustments modelers choose to use.
«We have to account for the fact that the ocean basins are actually getting slightly bigger... water volume is expanding,» he said, a phenomenon they
call glacial isostatic adjustment (GIA).
«B) how much SLR Note that B is dependent on A.» True but not only due to A So there is no glacial rebound
[glacial isostatic adjustment] and no erosion?
Wilson, T., Bevis, M., Konfal, S., Barletta, V., Aster, R., Chaput, J., Heeszel, D., Wiens, D., Lloyd, A., (2014), The POLENET - ANET integrated GPS and seismology approach to
understanding glacial isostatic adjustment and ice mass change in Antarctica, Abstract G51A - 034, presented at 2014 Fall Meeting, AGU, San Francisco, Calif..
Wiens, D., Heeszel, D., Sun, X., Lloyd, A., Nyblade, A., Anandakrishnan, S., Aster, R., Chaput, J., Huerta, A., Wilson, T., New Antarctic seismic structure models and implications for
glacial isostatic adjustment, Proc.
Eight new GPS receivers have been installed on bedrock in the southern Antarctic Peninsula for improvements in
glacial isostatic adjustment (GIA) model accuracy and GRACE - based ice mass change estimates.
But as you have just pointed out, the signal of
glacial isostatic adjustment is now smaller than the signal derived from GRACE.
You really need to look at multi-decadal time periods to determine trends, as in Church and White 2011 who found «1900 to 2009 is 1.7 ± 0.2 mm / year and since 1961 is 1.9 ± 0.4 mm / year» and «For 1993 — 2009 and after correcting for
glacial isostatic adjustment, the estimated rate of rise is 3.2 ± 0.4 mm / year from the satellite data and 2.8 ± 0.8 mm / year from the in situ data».
Some groups have tried to develop models of the rebounding land, so that sea level researchers can apply «
Glacial Isostatic Adjustments» (GIA) to their data to correct for the effects.
Finally, they believe that an adjustment of +0.3 mm / yr is necessary to account for Peltier's
Glacial Isostatic Adjustments (see Section 4).
Both are as a result of
glacial isostatic adjustment, the ongoing movement of land once burdened by ice - age glaciers.
These highstands imply an ongoing and moderate, sub - mm / yr, sea - level fall in the far field of the Late Pleistocene ice cover that has long been linked to the process of
glacial isostatic adjustment (GIA; Clark et al., 1978).
The only obvious match is what is expected:
Glacial isostatic adjustment.
The yearly mass balance estimates, based on pointmass inversion methods, have relatively large errors, both due to uncertainties in
the glacial isostatic adjustment (GIA) processes, especially for Antarctica, leakage from unmodelled ocean mass changes, and (for Greenland) difficulties in separating mass signals from the Greenland ice sheet and the adjacent Canadian ice caps.
Glacial isostatic adjustment, why we have glacial and interglacial periods, how we can reconstruct climate history, and how the Earth is responding to the retreat of the continental glaciers.
The data has been adjusted for
glacial isostatic adjustment.