Jökull - 01.01.2010, Page 9

Fifteen years of CGPS in Iceland
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Figure 3
Figure 2: Time series of detrended motion for a selected set of CGPS stations north of Vatnajökull. The mean velocity of
each site has been removed from the time series to emphasize time-varying motion of the sites. The original time series
were processed using Bernese 5.0. Data before 2007 was processed with reprocessed products (orbits, earth-orientation
parameters) from the Potsdam-Dresden Reprocessing. After 2007, final products from IGS were used for the processing.
The coordinates and velocities of 11 IGS sites surrounding the North Atlantic were also constrained in the PDR05 (Rülke
et al., 2008) using a minimum constraint condition, see Völksen et al. (2009) for details. All sites but MYVA are affected
by the filling and seasonal level changes of the Hálslón reservoir, the Upptyppingar-Álftadalsdyngja intrusion, and seasonal
load variations from Vatnajökull glacier. – Tímaraðir samfelldra GPS stöðva norðan Vatnajökuls. Meðalhraði hverrar
stöðvar hefur verið dreginn frá upprunalegu tímaröðinni til að draga fram tímaháðar breytingar í hreyfingum stöðvanna.
Unnið var úr gögnum með Bernese 5.0, og notaðar voru mismunandi gervitunglabrautir fyrir og eftir 2007 (Völksen et al.,
2009). Myndun Hálslóns, innskot undir Upptyppingum og Álftadalsdyngju og árlegar fargbreytingar á Vatnajökli hafa áhrif
á hreyfingar flestra stöðvanna.
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