A Reanalysis and Reinterpretation of Geodetic and Geological Evidence of Glacial-Isostatic Adjustment in the Churchill Region, Hudson Bay |
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| Authors: | Detlef Wolf Volker Klemann Johann Wünsch Fei-peng Zhang |
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| Institution: | (1) GeoForschungsZentrum Potsdam, Telegrafenberg, D-14473 Potsdam, Germany;(2) Geodetic Institute, University of Stuttgart, Geschwister-Scholl-Str. 24D D-70174 Stuttgart, Germany |
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| Abstract: | We review the historical, geological, tide-gauge, GPS and gravimetric evidence advanced in favour of, or against, continuing
land uplift around Hudson Bay, Canada. We also reanalyse the tide-gauge and GPS data for Churchill using longer time series
than those available to previous investigators. The dependence of the mean rate of relative sea-level change obtained from
the tide-gauge record on the length and mid-epoch of the observation interval considered is investigated by means of a newly
developed linear-trend analysis diagram. For studying the shorter-period variability of the tide-gauge record, the wavelet
transform is used. The mean rate of land uplift obtained from GPS is based on a new analysis using IGS solutions of GFZ. To
include the post-glacial land uplift, sea-level indicators from the Churchill region representing the relative sea-level history
during the past 8000 years are also used. Finally, the values of the four observables are jointly inverted in terms of mantle
viscosity. The optimum values are ~3.2 × 1020 Pa s and ~1.6 × 1022 Pa s for the upper- and lower-mantle viscosities, respectively. |
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| Keywords: | absolute gravimetry glacial-isostatic adjustment GPS Hudson Bay linear-trend analysis mantle viscosity sea-level indicator tide gauge wavelet-transform analysis |
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