A reanalysis and reinterpretation of geodetic and geomorphologic evidence of 
glacial-isostatic uplift in the Churchill region, Manitoba

Wolf, D.; Wünsch, J.; Klemann, Volker; Zhang, F.; Gravity Field and Gravimetry -2009, Geoengineering Centres, GFZ Publication Database, Deutsches GeoForschungsZentrum; 1.1 GPS/GALILEO Earth Observation, 1.0 Geodesy and Remote Sensing, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum; 1.3 Earth System Modelling, 1.0 Geodesy and Remote Sensing, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum; 1.2 Global Geomonitoring and Gravity Field, 1.0 Geodesy and Remote Sensing, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum

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A reanalysis and reinterpretation of geodetic and geomorphologic evidence of glacial-isostatic uplift in the Churchill region, Manitoba

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Wolf, D.
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Wünsch, J.
External Organizations;

/persons/resource/volkerk

Klemann, Volker
Deutsches GeoForschungsZentrum;

Zhang, F.
External Organizations;

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Zitation

Wolf, D., Wünsch, J., Klemann, V., Zhang, F. (2004): A reanalysis and reinterpretation of geodetic and geomorphologic evidence of glacial-isostatic uplift in the Churchill region, Manitoba, (EOS, Transactions, American Geophysical Union, 85(17), Suppl.), CGU-AGU-SEG-EEGS 2004 Joint Assembly (Montreal 2004) (Montreal, Canada).

https://gfzpublic.gfz-potsdam.de/pubman/item/item_231176

Zusammenfassung

We review the history of analyses of the tide-gauge record for Churchill, Manitoba, and advance a new analysis of the record using a longer time series than that available to Tushingham (1992). The sensitivity of the mean rate of relative sea-level change obtained to the averaging procedure employed is demonstrated by calculating rates for sliding observation intervals of variable widths. After that, the 'best' mean rate of relative sea-level rise is compared with estimates of the mean rate of land uplift and the mean rate of gravity change based on GPS and absolute gravimetry data, respectively. As an additional type of observation, the postglacial relative sea-level change obtained from paleo-shoreline evidence in the Churchill region is also included. Assuming that the governing process is glacial-isostatic adjustment, a joint inversion of the four types of data return upper- and lower-mantle viscosities of about $3 imes 10^{20}$ Pa s and $> 5 imes 10^{21}$ Pa s, respectively.