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Cowan, Ellen A; Zellers, Sarah D; Müller, Juliane; Walczak, Maureen H; Worthington, Lindsay L; Caissie, Beth; Clary, Wesley A; Jaeger, John M; Gulick, Sean P S; Pratt, Jacob W; Mix, Alan C; Fallon, Stewart J (2020): A multiproxy record of IODP Site 341-U1421 [dataset bundled publication]. PANGAEA, https://doi.org/10.1594/PANGAEA.919655

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Abstract:
The uncertain response of marine terminating outlet glaciers to climate change at time scales beyond short-term observation limits models of future sea level rise. At temperate tidewater margins, abundant subglacial meltwater forms morainal banks (marine shoals) or ice-contact deltas that reduce water depth, stabilizing grounding lines and slowing or reversing glacial retreat. Here we present a radiocarbon-dated record from Integrated Ocean Drilling Program (IODP) Site U1421 that tracks the terminus of the largest Alaskan Cordilleran Ice Sheet outlet glacier during Last Glacial Maximum climate transitions. Sedimentation rates, ice-rafted debris, and microfossil and biogeochemical proxies, show repeated abrupt collapses and slow advances typical of the tidewater glacier cycle observed in modern systems. When global sea level rise exceeded the local rate of bank building, the cycle of readvances stopped leading to irreversible retreat. These results support theory that suggests sediment dynamics can control tidewater terminus position on an open shelf under temperate conditions delaying climate-driven retreat.
Keyword(s):
Cordilleran Ice Sheet; deglacial; Gulf of Alaska; LGM
Supplement to:
Cowan, Ellen A; Zellers, Sarah D; Müller, Juliane; Walczak, Maureen H; Worthington, Lindsay L; Caissie, Beth; Clary, Wesley A; Jaeger, John M; Gulick, Sean P S; Pratt, Jacob W; Mix, Alan C; Fallon, Stewart J (2020): Sediment controls dynamic behavior of a Cordilleran Ice Stream at the Last Glacial Maximum. Nature Communications, 11(1), https://doi.org/10.1038/s41467-020-15579-0
Project(s):
Integrated Ocean Drilling Program / International Ocean Discovery Program (IODP)
Coverage:
Median Latitude: 59.507239 * Median Longitude: -144.045617 * South-bound Latitude: 59.507200 * West-bound Longitude: -144.045700 * North-bound Latitude: 59.507300 * East-bound Longitude: -144.045500
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Size:
9 datasets

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Datasets listed in this bundled publication

  1. Cowan, EA; Zellers, SD; Müller, J et al. (2020): Age determination of IODP Site 341-U1421. https://doi.org/10.1594/PANGAEA.919582
  2. Cowan, EA; Zellers, SD; Müller, J et al. (2020): Bchron age model of IODP Site 341-U1421. https://doi.org/10.1594/PANGAEA.919585
  3. Cowan, EA; Zellers, SD; Müller, J et al. (2020): Foraminifera of IODP Site 341-U1421. https://doi.org/10.1594/PANGAEA.919654
  4. Cowan, EA; Zellers, SD; Müller, J et al. (2020): Geochemical analysis of IODP Site 341-U1421. https://doi.org/10.1594/PANGAEA.919644
  5. Cowan, EA; Zellers, SD; Müller, J et al. (2020): Ice rafted debris of IODP Site 341-U1421. https://doi.org/10.1594/PANGAEA.919746
  6. Cowan, EA; Zellers, SD; Müller, J et al. (2020): Stable carbon and oxygen isotope ratios of foraminifera of IODP Site 341-U1421. https://doi.org/10.1594/PANGAEA.919588
  7. Cowan, EA; Zellers, SD; Müller, J et al. (2020): Diatom analyses of IODP Site 341-U1421. https://doi.org/10.1594/PANGAEA.919613
  8. Cowan, EA; Zellers, SD; Müller, J et al. (2020): Sea ice rafted quartz grains of IODP Site 341-U1421. https://doi.org/10.1594/PANGAEA.919645
  9. Cowan, EA; Zellers, SD; Müller, J et al. (2020): Sedimentation rates of IODP Site 341-U1421. https://doi.org/10.1594/PANGAEA.919587