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An exercise of combining tide gauge and GPS
results to derive trends in sea level
G. Wöppelmann, B. Martín, M-N. Bouin, Z. Altamimi

• Considering the major advances recently made in
• Absolute antenna phase centre corrections for
  both GPS satellites and receivers
• (IGSMAIL-5272, Gendt 2005)
• Troposphere VMF or GMF mapping function (Boehm
  et al. 2005)
• Atmospheric pressure loading corrections
  (Tregoning and van Dam 2005)
• RF network extension to 92 IGb00 RF stations
  (IGSSTATION-352, Ferland 2005)
• New ITRF2005 datum (Altamimi)
• Approach of time series combination of
  coordinates solutions (Altamimi et al 2002)
• we started to reprocess backwards GPS data (from
  2005.7 to 2001.4)
• and
• we carried out an exercise of combining TG and
  GPS results
• to derive GPS-corrected TG trends

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1.24 1.25
1.63 1.50
1.57 2.06
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Transformation parameters between each weekly
solution and the combined one expressed in
ITRF2005
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