Topic IV: Observations and calibrated reconstructions

  • Quantifying requirements for an optimal and integrated (satellite and ground based) sea level observing system; improvement of observational record of mass balance estimates and sea level change in shelf sea regions (drainage basin scale); improvement of GIA models and separation of different contributions to mass loss; quantifying mass loss based on natural system, intrinsic variability versus response to atmospheric/oceanic forcing.
  • Participating in coordinated multi-method, multi-model reconstructions of regional sea level changes during the last century which will, in particular, be needed to quantify remaining uncertainties; complementing the analysis of sparse tide gauge records by exploring information residing in corals, salt marshes and other geological archives, and their potential use as proxy data for regional sea level on multi-decadal and longer time scales.
  • Identifying weaknesses in the observational datasets of paleo sea level change; supplementing geologic sea level indicators with geodetic data, while accounting for other contributors to these observations.

Approach

The work program of SeaLevel is structured in four basic topics, which are addressed by several working groups: 

Topic I

Origin of regional sea level changes at decadal-to-centennial time scale

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Topic II

Historic sea level estimates (paleo time scale)

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Topic III

Sea level projections

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Topic IV

Observations and calibrated reconstructions

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