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Analysis of continuous GPS measurements from southern Victoria Land, Antarctica

January 1, 2007

Several years of continuous data have been collected at remote bedrock Global Positioning System (GPS)
sites in southern Victoria Land, Antarctica. Annual to sub-annual variations are observed in the position time-series. An
atmospheric pressure loading (APL) effect is calculated from pressure field anomalies supplied by the European Centre
for Medium-Range Weather Forecasts (ECMWF) model loading an elastic Earth model. The predicted APL signal has
a moderate correlation with the vertical position time-series at McMurdo, Ross Island (International Global Navigation
Satellite System Service (IGS) station MCM4), produced using a global solution. In contrast, a local solution in which
MCM4 is the fiducial site generates a vertical time series for a remote site in Victoria Land (Cape Roberts, ROB4)
which exhibits a low, inverse correlation with the predicted atmospheric pressure loading signal. If, in the future,
known and well modeled geophysical loads can be separated from the time-series, then local hydrological loading, of
interest for glaciological and climate applications, can potentially be extracted from the GPS time-series.

Publication Year 2007
Title Analysis of continuous GPS measurements from southern Victoria Land, Antarctica
DOI 10.3133/ofr20071047SRP065
Authors Michael J. Willis
Publication Type Report
Publication Subtype USGS Numbered Series
Series Title Open-File Report
Series Number 2007-1047-SRP-064
Index ID ofr20071047SRP065
Record Source USGS Publications Warehouse