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Table 1 Parameters of AG points (Sun et al., 2010) and their nearest GNSS stations

From: Updated absolute gravity rate of change associated with glacial isostatic adjustment in Southeast Alaska and its utilization for rheological parameter estimation

AG point
Name EGAN MGVC GBCL RUSG HNSG BRMC
Latitude [deg] 58.38534 58.41736 58.45462 58.90639 59.23186 60.00183
Longitude [deg] −134.64002 −134.54617 −135.87488 −136.78908 −135.45977 −136.85511
Elevation [m] 38.0 8.0 21.0 10.0 21.0 840.0
Nominal air pressure [hPa] 1008.69 1012.29 1010.73 1012.05 1010.73 916.33
Gravity gradient [\(\upmu\)Gal/cm] −2.734 −2.045a −3.099 −3.468 −3.093 −2.910
   −2.364b     
Distance to nearest glacierc [km] 7.37 1.46 30.82 6.81 11.56 31.09
Continuous GNSS station
Name AB50 AB50 GUS0d QUIC AB44 MDFC
Data analyst UNAVCO UNAVCO UNAVCO NGLe UNAVCO NGL
Latitude [deg] 58.41678 58.41678 58.41776 58.90856 59.52804 60.12182
Longitude [deg] −134.54530 −134.54530 −135.69705 −136.58682 −135.22830 −136.95833
Elipsoidal height [m] 51.6 51.6 19.9 23.8 304.2 897.0
Distance from AG point [km] 6.53 0.08 11.13 11.61 35.42 14.51
  1. a The gravity gradient value at the old AG point in 2006–2008 (Sun et al., 2010).
  2. b The gravity gradient value at the new AG point in 2012–2015. During the AG campaign measurement at MGVC in 2012, we observed the gravity difference between 0.0 and 100.0 cm heights from the new AG point using the LaCoste & Romberg’s G578 relative gravimeter by ten times repeatedly, and determined the gravity gradient value by averaging the observed gravity difference values.
  3. c The 3-D distances from each AG point to the nearest glacier using the PDIM model (UAF07, Larsen et al. 2007).
  4. d Because the GNSS station of GUS2 was replaced to GUS6 on 20 June 2008, we named a hypothetical GNSS station GUS0 and created its continuous time series from those collected at GUS2 and GUS6 by removing coordinate steps due to the relocation of the GNSS station.
  5. e Nevada Geodetic Laboratory (NGL).