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Cryospheric and Hydrologic Contributions to Global Sea Level Change

This presentation discusses sea level rise contributions from Greenland, Antarctica, and Alaskan glaciers using GRACE data. It covers trends, mass loss rates, and uncertainties for different regions, along with the global ocean mass budget.

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Cryospheric and Hydrologic Contributions to Global Sea Level Change

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  1. Cryospheric and Hydrologic Contributionsto Global Sea Level Change M. Tamisiea Proudman Oceanographic Laboratory R. Steven Nerem University of Colorado AGU Meeting of the Americas, August 8-11, 2010

  2. Measurements of Sea Level Change GRAVITY

  3. Global Mean Sea Level Trend = 3.3 mm/year

  4. Mean Sea Level

  5. Area-Weighted Contribution to GMSL

  6. MSL Rates in 10° Latitude Bands

  7. Spatial Variations in Sea Level Rise 1993-2010

  8. Detrended GMSL and MEI

  9. Hydrology Model vs GRACE [Llovel et al., 2010]

  10. Hydrology Model vs Altimeter GMSL [Llovel et al., 2010]

  11. Hydrology Model vs Tide Gauge GMSL [Llovel et al., 2010]

  12. GRACE Secular Trends (2002-2009) GIA Model Removed [Wahr, 2009]

  13. Greenland Ice Mass Changes from GRACE April, 2002 – June, 2010 Total Greenland ice volume Rate of Ice mass change: All Greenland: -239 Gton/yr South Greenland: -162 Gton/yr North Greenland: -77 Gton/yr (1 Gton = 1 km3 of water) -239 Gton/yr = 0.66 mm/yr sea level rise [Wahr, 2010]

  14. Antarctica Ice Mass Variations from GRACE Total Antarctic ice mass (noisy because of atmospheric pressure errors) April, 2002 – June, 2010 Rate of ice mass change: All Antarctica: -143 Gton/yr West Antarctica: -155 Gton/yr East Antarctica: +15 Gton/yr Uncertainty of GIA correction: All Antarctica: ± 80 Gton/yr West Antarctica: ± 20 Gton/yr East Antarctica: ± 55 Gton/yr -143 Gton/yr = 0.40 mm/yr sea level rise [Wahr, 2010]

  15. Alaskan Glaciers from GRACE Rate of mass change between April, 2002 and May, 2010 . Rate of mass change: -55 Gton/yr = 0.15 mm/yr sea level rise [Wahr, 2010]

  16. Summary of GRACE Ice GMSL Contributions GRACE provides mass loss estimates for entire ice sheets. Between April 2002 and May/June 2010: Greenland lost ice at a rate of 239 Gton/yr. Antarctica lost ice at a rate of 143 Gton/yr. Alaskan glaciers lost ice at a rate of 55 Gton/yr. Total: 437 Gt/yr, equivalent to 1.2 mm/yr sea level rise.

  17. Global Ocean Mass from GRACE

  18. Global Ocean Mass from GRACE

  19. GIA Correction to GRACE Ocean Mass Rate

  20. Current Sea Level Budget Thermal Expansion: ~ 1.1 mm/year + Mountain Glaciers: ~ 1.2 mm/year + Greenland Ice Melt: ~ 0.6 mm/year + Antarctic Ice Melt: ~ 0.4 mm/year Land Water Storage: ? = Total: ~ 3.3 mm/year

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