Richard M Bingley ESEASRI WP2 Leader

1
Overview of the ESEAS-RI Project WP2 Absolute
Sea Level Variations

• Richard M Bingley (ESEAS-RI WP2 Leader)
• IESSG, University of Nottingham
• ESEAS-RI WP2 5th Meeting13 May 2005, University
  of Nottingham, UK

2
WP2 Task 2.1

• Define, implement and validate a CGPS processing
  strategy, with special emphasis on the vertical
  component, which will enable the determination of
  vertical station velocities
• in a consistent reference frame
• with an accuracy of 1mm/yr
• To Do
• Produce final ESEAS-RI documents that are
  consistent with what was actually carried out
  through Task T2.3 by June 2005

3
WP2 Task 2.2

• Define, implement and validate a strategy for the
  analysis of CGPS time series which will enable
  the determination of vertical station velocities
• in a consistent reference frame
• with an uncertainty of less than 0.5mm/yr
• To Do
• Produce a final ESEAS-RI document that is
  consistent with what was actually carried out
  through Task T2.5 by August 2005

4
WP2 Task 2.3

• Carry out a coherent processing of all of the
  observations from CGPS stations co-located with
  ESEAS Observing Sites
• based on the strategy developed in T2.1
• To Do
• All ACs to produce final coordinate time series
  for the period from January 2000 to March 2005
  for all CGPS stations co-located with ESEAS
  Observing Sites by the end of June 2005

5
WP2 Task 2.4

• Assemble information on physical parameters that
  may affect CGPS time series, eg
• ocean tide loading
• atmospheric pressure loading
• hydrological loading
• To Do
• Time series for atmospheric pressure loading
  effects on all IGb00 stations to be added to the
  ESEAS data server by June 2005

6
WP2 Task 2.5

• Carry out a coherent analysis of the time series
  from the CGPS_at_TG stations co-located with ESEAS
  Observing Sites
• based on the strategy developed in T2.2
• To Do
• Produce final results for the period from January
  2000 to March 2005 for all CGPS stations
  co-located with ESEAS Observing Sites by the end
  of August 2005

7
WP2 Task 2.6

• Carry out absolute gravity measurements at
  selected ESEAS Observing Sites
• To Do
• Available information must be made available on
  the ESEAS Data Server by the end of June 2005 and
  September 2005

8
WP2 Task 2.7

• Assemble information on (historical and current)
  precise levelling at all ESEAS Observing Sites
  that are co-located with CGPS_at_TG stations
• To Do
• Available information must be made available on
  the ESEAS Data Server by the end of June 2005

9
WP2 Task 2.8

• Assess the contribution of vertical land
  movements and absolute sea level variations to
  changes in relative sea level, using the results
  of
• T2.5
• T2.6
• T2.7
• To Do
• Carry out the task in August and September 2005

10
Final Report/Papers

• Outputs from Task T2.5 reported by T2.8 as
• Intra-software comparisons
• NMA_jpl / ROA_jpl / UPC_jpl and NMA_igs /
  UPC_igs
• Regional versus global solution tests
• UNOTT_rnh4 / UNOTT_gnh7
• GCM_rns / GCM_gns
• UNOTT_rnh4 / GCM_rns / SRC_rns
• Global solution vertical station velocity
  estimates
• Independent NMA_jpl and ROA_jpl solutions
• UNOTT_gnh7
• GCM_gns

11
Final Report/Papers

• Outputs from Task T2.5 reported by T2.8 as
• Comparisons of global solution coordinate
  timeseries with APL
• Testing of the impact, but recommend not to
  correct until APL is accounted for in global
  products
• Comparison of global solution coordinate time
  series with IGS TIGA coordinate time series
• based on daily SINEX files (re Woppelmann)
• Estimation of time series length required based
  on uncertainties
• /- 0.5 mm/yr requires 11 years
• /- 0.1 mm/yr requires 52 years

12
Final Report/Papers

• Outputs from Task T2.8 reported as
• Range of values based on the four global solution
  coordianate time series
• Vertical station velocity of X.X to Z.Z
  mm/yrwith an uncertainty of x.x to z.z mm/yr

13
WP2 Schematic
T2.1 T2.2 T2.3 T2.5 T2.6 CGPS ( absg)
Tide gauge measurements of changes in sea level
T2.4 T2.5 T2.7 Loading, Levelling
Periodic and local vertical land movements
Changes in sea level decoupled from
land movements
Long-term vertical land movements