TY - JOUR
T1 - Evidence for a Highly Dynamic West Antarctic Ice Sheet During the Pliocene
AU - IODP Expedition 379 Scientists
AU - Gohl, Karsten
AU - Uenzelmann-Neben, Gabriele
AU - Gille-Petzoldt, Johanna
AU - Hillenbrand, Claus Dieter
AU - Klages, Johann P.
AU - Bohaty, Steven M.
AU - Passchier, Sandra
AU - Frederichs, Thomas
AU - Wellner, Julia S.
AU - Lamb, Rachel
AU - Leitchenkov, German
AU - Klaus, A.
AU - Kulhanek, D.
AU - Bauersachs, T.
AU - Courtillat, M.
AU - Cowan, E.
AU - De Lira Mota, M.
AU - Esteves, M.
AU - Fegyveresi, J.
AU - Gao, L.
AU - Halberstadt, A.
AU - Horikawa, K.
AU - Iwai, M.
AU - Kim, J.
AU - King, T.
AU - Penkrot, M.
AU - Prebble, J.
AU - Rahaman, W.
AU - Reinardy, B.
AU - Renaudie, J.
AU - Robinson, D.
AU - Scherer, R.
AU - Siddoway, C.
AU - Wu, L.
AU - Yamane, M.
N1 - Funding Information:
The authors are grateful to the International Ocean Discovery Program (IODP) organizations, in particular the JOIDES Resolution Science Operator (JRSO) as well as the master and his ship and drill crews of RV JOIDES Resolution for their support in conducting IODP Expedition 379. This research used samples and data provided by the IODP. Thanks to John B. Anderson for providing SCS line NBP9902‐11. The TH86 line is from the SCAR Antarctic Seismic Data Library System (SDLS). Our thanks also go to the master, crew and science team of the RV Akademik Alexander Karpinsky for collecting and providing swath bathymetry data of the deep‐sea channel. The contribution of R. Lamb was funded by the Deutsche Forschungsgemeinschaft (DFG) in the framework of Priority Program 527 IODP through grant GO724/19‐1. Contribution of C.‐D. Hillenbrand was funded through Natural Environment Research Council (NERC) UK IODP grant NE/T010975/1. S. Passchier was funded by the U.S. Science Support Program under National Science Foundation (NSF) award #OCE1450528 subcontract 94 (GG009393). The study contributes to the Scientific Research Program “Instabilities and Thresholds in Antarctica” (INSTANT) of the Scientific Committee for Antarctic Research (SCAR). The authors would like to thank Emerson E&P Software, Emerson Automation Solutions, for providing licenses for the seismic software Paradigm in the scope of the Emerson Academic Program. Constructive comments by Laura De Santis and two anonymous reviewers helped improve the manuscript. Open access funding enabled and organized by Projekt DEAL.
Funding Information:
The authors are grateful to the International Ocean Discovery Program (IODP) organizations, in particular the JOIDES Resolution Science Operator (JRSO) as well as the master and his ship and drill crews of RV JOIDES Resolution for their support in conducting IODP Expedition 379. This research used samples and data provided by the IODP. Thanks to John B. Anderson for providing SCS line NBP9902-11. The TH86 line is from the SCAR Antarctic Seismic Data Library System (SDLS). Our thanks also go to the master, crew and science team of the RV Akademik Alexander Karpinsky for collecting and providing swath bathymetry data of the deep-sea channel. The contribution of R. Lamb was funded by the Deutsche Forschungsgemeinschaft (DFG) in the framework of Priority Program 527 IODP through grant GO724/19-1. Contribution of C.-D. Hillenbrand was funded through Natural Environment Research Council (NERC) UK IODP grant NE/T010975/1. S. Passchier was funded by the U.S. Science Support Program under National Science Foundation (NSF) award #OCE1450528 subcontract 94 (GG009393). The study contributes to the Scientific Research Program ?Instabilities and Thresholds in Antarctica? (INSTANT) of the Scientific Committee for Antarctic Research (SCAR). The authors would like to thank Emerson E&P Software, Emerson Automation Solutions, for providing licenses for the seismic software Paradigm in the scope of the Emerson Academic Program. Constructive comments by Laura De Santis and two anonymous reviewers helped improve the manuscript. Open access funding enabled and organized by Projekt DEAL.
Publisher Copyright:
© 2021. The Authors.
PY - 2021/7/28
Y1 - 2021/7/28
N2 - Major ice loss in the Amundsen Sea sector of the West Antarctic Ice Sheet (WAIS) is hypothesized to have triggered ice sheet collapses during past warm periods such as those in the Pliocene. International Ocean Discovery Program (IODP) Expedition 379 recovered continuous late Miocene to Holocene sediments from a sediment drift on the continental rise, allowing assessment of sedimentation processes in response to climate cycles and trends since the late Miocene. Via seismic correlation to the shelf, we interpret massive prograding sequences that extended the outer shelf by 80 km during the Pliocene through frequent advances of grounded ice. Buried grounding zone wedges indicate prolonged periods of ice-sheet retreat, or even collapse, during an extended mid-Pliocene warm period from ∼4.2–3.2 Ma inferred from Expedition 379 records. These results indicate that the WAIS was highly dynamic during the Pliocene and major retreat events may have occurred along the Amundsen Sea margin.
AB - Major ice loss in the Amundsen Sea sector of the West Antarctic Ice Sheet (WAIS) is hypothesized to have triggered ice sheet collapses during past warm periods such as those in the Pliocene. International Ocean Discovery Program (IODP) Expedition 379 recovered continuous late Miocene to Holocene sediments from a sediment drift on the continental rise, allowing assessment of sedimentation processes in response to climate cycles and trends since the late Miocene. Via seismic correlation to the shelf, we interpret massive prograding sequences that extended the outer shelf by 80 km during the Pliocene through frequent advances of grounded ice. Buried grounding zone wedges indicate prolonged periods of ice-sheet retreat, or even collapse, during an extended mid-Pliocene warm period from ∼4.2–3.2 Ma inferred from Expedition 379 records. These results indicate that the WAIS was highly dynamic during the Pliocene and major retreat events may have occurred along the Amundsen Sea margin.
KW - Amundsen Sea Embayment
KW - grounding zone wedge
KW - IODP Expedition 379
KW - Pliocene climate
KW - seismic stratigraphy
KW - West Antarctic Ice Sheet
UR - http://www.scopus.com/inward/record.url?scp=85112368519&partnerID=8YFLogxK
U2 - 10.1029/2021GL093103
DO - 10.1029/2021GL093103
M3 - Article
AN - SCOPUS:85112368519
SN - 0094-8276
VL - 48
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 14
M1 - e2021GL093103
ER -