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Glaciation-Induced Sea-Level Change: Theory and Applications

Glaciation-Induced Sea-Level Change: Theory and Applications. Glenn Milne, University of Durham. February 2004. GIA MODEL. Earth Forcing. Earth Rheology. Impulse response formalism Linear Maxwell rheology 1D structure. Rotational potential. Surface loading. Euler equations. Ice.

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Glaciation-Induced Sea-Level Change: Theory and Applications

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  1. Glaciation-Induced Sea-Level Change: Theory and Applications Glenn Milne, University of Durham February 2004

  2. GIA MODEL Earth Forcing Earth Rheology Impulse response formalism Linear Maxwell rheology 1D structure Rotational potential Surface loading Euler equations Ice Other? Interdisciplinary approach Ice dammed lakes Sediment redistribution Ocean Sea-level equation Ice history and Earth rheology are the key inputs

  3. http://www.ngdc.noaa.gov/paleo/slides/slideset/index11.htm

  4. Geoid Perturbation Mitrovica et al., Nature, 409, 2001.

  5. Solid Surface Perturbation

  6. Ice-Induced Syphoning Mitrovica & Milne (2002)

  7. Ocean-Induced Syphoning Mitrovica & Milne (2002)

  8. Solving the Sea-Level Equation • General methodology used is straightforward. • Most groups now adopt the pseudo-spectral algorithm (Mitrovica and Peltier 1991). • Some recent improvements have been incorporated: • - Time-dependent shorelines (Lambeck &Nakada 1990; Johnston 1993; Peltier 1994) • Rotational feedback (Han & Wahr 1989; Milne & Mitrovica 1996;1998) • Near-field water influx (Milne 1998; Milne et al. 1999).

  9. Applications of Sea-Level Model • Infer solid earth rheology. • Constrain regional ice sheet histories. • Infer magnitude and source of glacial melt water • -Glacial • -Holocene • -Present.

  10. Clark et al. (2002) • Data from 3 far-field sites indicate a massive melt water influx at ~14,250 yr BP (mwp-IA). • Event of this magnitude would have a dramatic effect on climate system. • Source(s) of mwp-IA strongly debated.

  11. Fingerprinting the Source of mwp-IA Clark et al. (2002)

  12. Fingerprinting the Source of mwp-IA Clark et al. (2002)

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