Estimates of Global Sea Level Rise from Tide Gauges

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Estimates of Global Sea Level Rise from Tide
Gauges
Sea level trend, 1994-2008
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Method

• Compute average trend in 10 latitude bands
• Estimate sampling error w/ Monte Carlo
  simulations
• Assess error due to vertical land motion (VLM)
  using TG-ALT residual trends

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Sampling error
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VLM GPS vs. AVISO
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Area of bands
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Comparison with Church and White (2006)
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Conclusions

• Tide gauge networks provide estimates of global
  sea level change consistent with altimetry.
• Error analysis provides means for assessing
  impact of individual tide gauges and GPS on
  global trend uncertainty.
• Largest errors to global trend due to sparse
  Southern Hemisphere coverage.
• Estimates from GCOS (170 stations) are comparable
  to GLOSS (290 stations).
• Land motion contributes 30 increase in
  uncertainty of global trend, and possibly a 0.5
  mm/yr bias error. GPS trend corrections are
  consistent with TG-ALT differences.
• Tide gauges show a statistically significant
  acceleration in global sea level trend,
  transitioning from 1-2 mm/yr rise prior to 1980
  to 3 mm/yr at present, consistent with altimetry
  and previous tide gauge trend estimates.

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VLM GIA vs AVISO
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