Abstract
During the middle and late Eocene (∼48-34 Myr ago), the Earth's climate cooled1,2 and an ice sheet built up on Antarctica. The stepwise expansion of ice on Antarctica3,4induced crustal deformation and gravitational perturbations around the continent. Close to the ice sheet, sea level rose5,6despite an overall reduction in the mass of the ocean caused by the transfer of water to the ice sheet. Here we identify the crustal response to ice-sheet growth by forcing a glacial-hydro isostatic adjustment model7 with an Antarctic ice-sheet model. We find that the shelf areas around East Antarctica first shoaled as upper mantle material upwelled and a peripheral forebulge developed. The inner shelf subsequently subsided as lithosphere flexure extended outwards from the ice-sheet margins. Consequently the coasts experienced a progressive relative sea-level rise. Our analysis of sediment cores from the vicinity of the Antarctic ice sheet are in agreement with the spatial patterns of relative sea-level change indicated by our simulations. Our results are consistent with the suggestion8 that near-field processes such as local sea-level change influence the equilibrium state obtained by an icesheet grounding line.
| Original language | English |
|---|---|
| Pages (from-to) | 380-384 |
| Number of pages | 5 |
| Journal | Nature Geoscience |
| Volume | 6 |
| Issue number | 5 |
| DOIs | |
| State | Published - May 2013 |
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Relative sea-level rise around East Antarctica during Oligocene glaciation. / Stocchi, Paolo; Escutia, Carlota; Houben, Alexander J.P.; Vermeersen, Bert L.A.; Bijl, Peter K.; Brinkhuis, Henk; DeConto, Robert M.; Galeotti, Simone; Passchier, Sandra; Pollard, David; Klaus, Adam; Fehr, Annick; Williams, Trevor; Bendle, James A.P.; Bohaty, Steven M.; Carr, Stephanie A.; Dunbar, Robert B.; Flores, Jose Abel; Gonzàlez, Jhon J.; Hayden, Travis G.; Iwai, Masao; Jimenez-Espejo, Francisco J.; Katsuki, Kota; Kong, Gee Soo; McKay, Robert M.; Nakai, Mutsumi; Olney, Matthew P.; Pekar, Stephen F.; Pross, Jörg; Riesselman, Christina; Röhl, Ursula; Sakai, Toyosaburo; Shrivastava, Prakash Kumar; Stickley, Catherine E.; Sugisaki, Saiko; Tauxe, Lisa; Tuo, Shouting; Van De Flierdt, Tina; Welsh, Kevin; Yamane, Masako.
In: Nature Geoscience, Vol. 6, No. 5, 05.2013, p. 380-384.Research output: Contribution to journal › Article
TY - JOUR
T1 - Relative sea-level rise around East Antarctica during Oligocene glaciation
AU - Stocchi, Paolo
AU - Escutia, Carlota
AU - Houben, Alexander J.P.
AU - Vermeersen, Bert L.A.
AU - Bijl, Peter K.
AU - Brinkhuis, Henk
AU - DeConto, Robert M.
AU - Galeotti, Simone
AU - Passchier, Sandra
AU - Pollard, David
AU - Klaus, Adam
AU - Fehr, Annick
AU - Williams, Trevor
AU - Bendle, James A.P.
AU - Bohaty, Steven M.
AU - Carr, Stephanie A.
AU - Dunbar, Robert B.
AU - Flores, Jose Abel
AU - Gonzàlez, Jhon J.
AU - Hayden, Travis G.
AU - Iwai, Masao
AU - Jimenez-Espejo, Francisco J.
AU - Katsuki, Kota
AU - Kong, Gee Soo
AU - McKay, Robert M.
AU - Nakai, Mutsumi
AU - Olney, Matthew P.
AU - Pekar, Stephen F.
AU - Pross, Jörg
AU - Riesselman, Christina
AU - Röhl, Ursula
AU - Sakai, Toyosaburo
AU - Shrivastava, Prakash Kumar
AU - Stickley, Catherine E.
AU - Sugisaki, Saiko
AU - Tauxe, Lisa
AU - Tuo, Shouting
AU - Van De Flierdt, Tina
AU - Welsh, Kevin
AU - Yamane, Masako
PY - 2013/5
Y1 - 2013/5
N2 - During the middle and late Eocene (∼48-34 Myr ago), the Earth's climate cooled1,2 and an ice sheet built up on Antarctica. The stepwise expansion of ice on Antarctica3,4induced crustal deformation and gravitational perturbations around the continent. Close to the ice sheet, sea level rose5,6despite an overall reduction in the mass of the ocean caused by the transfer of water to the ice sheet. Here we identify the crustal response to ice-sheet growth by forcing a glacial-hydro isostatic adjustment model7 with an Antarctic ice-sheet model. We find that the shelf areas around East Antarctica first shoaled as upper mantle material upwelled and a peripheral forebulge developed. The inner shelf subsequently subsided as lithosphere flexure extended outwards from the ice-sheet margins. Consequently the coasts experienced a progressive relative sea-level rise. Our analysis of sediment cores from the vicinity of the Antarctic ice sheet are in agreement with the spatial patterns of relative sea-level change indicated by our simulations. Our results are consistent with the suggestion8 that near-field processes such as local sea-level change influence the equilibrium state obtained by an icesheet grounding line.
AB - During the middle and late Eocene (∼48-34 Myr ago), the Earth's climate cooled1,2 and an ice sheet built up on Antarctica. The stepwise expansion of ice on Antarctica3,4induced crustal deformation and gravitational perturbations around the continent. Close to the ice sheet, sea level rose5,6despite an overall reduction in the mass of the ocean caused by the transfer of water to the ice sheet. Here we identify the crustal response to ice-sheet growth by forcing a glacial-hydro isostatic adjustment model7 with an Antarctic ice-sheet model. We find that the shelf areas around East Antarctica first shoaled as upper mantle material upwelled and a peripheral forebulge developed. The inner shelf subsequently subsided as lithosphere flexure extended outwards from the ice-sheet margins. Consequently the coasts experienced a progressive relative sea-level rise. Our analysis of sediment cores from the vicinity of the Antarctic ice sheet are in agreement with the spatial patterns of relative sea-level change indicated by our simulations. Our results are consistent with the suggestion8 that near-field processes such as local sea-level change influence the equilibrium state obtained by an icesheet grounding line.
UR - http://www.scopus.com/inward/record.url?scp=84877249297&partnerID=8YFLogxK
U2 - 10.1038/NGEO1783
DO - 10.1038/NGEO1783
M3 - Article
AN - SCOPUS:84877249297
VL - 6
SP - 380
EP - 384
JO - Nature Geoscience
JF - Nature Geoscience
SN - 1752-0894
IS - 5
ER -