Simulation der dynamischen Wechselwirkung zwischen Eischild und Meeresspiegel mit einem gekoppelten Eis-/Erdmodell

• Antragsteller: Dr. Ingo Sasgen
• Fachliche Zuordnung: Geodäsie, Photogrammetrie, Fernerkundung, Geoinformatik, Kartographie ; Paläontologie
• Förderung: Förderung von 2013 bis 2015
• Projektkennung: Deutsche Forschungsgemeinschaft (DFG) - Projektnummer 248087342

• Erstellungsjahr: 2015

Zusammenfassung der Projektergebnisse

Both of our studies have shown the importance of a thorough treatment of the solid Earth when simulating the AIS through periods of millennial time scales, and we suggest that similar studies can be undertaken in order to test this for the Northern hemispheric paleo ice sheets, such as the Laurentide Ice Sheet or the Barents Sea Ice Sheet, which both featured significant portions of grounded ice below sea level and therefore should be affected by these mechanisms of ice/Earth interplay. However, the importance of the ice / solid Earth feedback depends on the magnitude of the climatic forcing of the ice sheet. Only if this climatic forcing is modest, the weak or soft characteristics of the applied solid Earth structure leads the ice sheet to either stability or partial collapse. The evaluation of the climatic forcing has not been part of this project, and we relied on common approaches for parameterizing multimillennial variations of atmospheric and oceanic conditions. A more quantitative study of the Earth's possible impact on the AIS dynamics in the future or in the past will therefore require a more rigorous and physicallybased prescription of the AIS atmospheric and oceanic environment. This could be realized in a fully coupled atmosphere / ocean / ice / solid Earth system. Likewise, an assessment of the Earth structure's impact on the Antarctic post-LGM deglaciation could be improved by a more comprehensive prescription of the past climate conditions. Finally, Earth structure models need to be improved to tighten the range of plausible viscosity profiles on a global scale.

Projektbezogene Publikationen (Auswahl)

• (2013) Antarctic regional ice-mass trends 2002 to 2012 from GRACE satellite gravimetry and an improved estimate of glacial-isostatic adjustment. The Cryosphere, 7, 1499–1512
  Sasgen, I.; Konrad, H.; van den Broeke, M.; Ivins, E.; Bamber, J.; Martinec, Z.
  (Siehe online unter https://doi.org/10.5194/tc-7-1499-2013)
• (2014): ESA ITT CryoSat+ REGINA: Final Report (D6.1) for determining Regional glacial isostatic adjustment and CryoSat elevation rate corrections in Antarctica, Issue 2.2 Doc. Ref. REGINA_D6_1_issue_2.2,
  Sasgen, I. & Konrad, H. the REGINA Consortium
  
• The deformational response of a viscoelastic solid earth model coupled to a thermomechanical ice sheet model. Surv. Geophys., 35(6):1441-1458, 2014
  Konrad, H., M. Thoma, I. Sasgen, V. Klemann, D. Barbi, K. Grosfeld, and Z. Martinec
  (Siehe online unter https://doi.org/10.1007/s10712-013-9257-8)
• Potential of the solid-Earth response for limiting long-term West Antarctic Ice Sheet retreat in a warming climate. Earth Planet. Sci. Lett.
  Konrad, H., I. Sasgen, D. Pollard, and V. Klemann
  (Siehe online unter https://doi.org/10.1016/j.epsl.2015.10.008)
• Sea-level and solid-Earth feedbacks on ice-sheet dynamics (2015), Dissertation, Freie Universität Berlin
  Konrad, H.
  
• Sensitivity of grounding-line dynamics to viscoelastic deformaition of the solid-earth in an idealized szenario. Polarforschung 85 (2), 89–99, 2015 (erschienen 2016)
  Konrad, H., Sasgen, I., Klemann, V., Thoma, M., Grosfeld, K. and Martinec, Z.
  (Siehe online unter https://dx.doi.org/10.2312/polfor.2016.005)