Articles | Volume 43, issue 1
https://doi.org/10.5194/jm-43-187-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/jm-43-187-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
01 Jul 2024
Research article |
| 01 Jul 2024
| 01 Jul 2024
Return to the Ross Ice Shelf Project (RISP), Site J-9 (1977–1979): perspectives of West Antarctic Ice Sheet history from Miocene and Holocene benthic foraminifera
Serena N. Dameron
CORRESPONDING AUTHOR
Department of Earth, Geographic, and Climate Sciences, University of Massachusetts, Amherst, MA 01003, USA
R. Mark Leckie
Department of Earth, Geographic, and Climate Sciences, University of Massachusetts, Amherst, MA 01003, USA
David Harwood
Department of Earth and Atmospheric Sciences, University of Nebraska-Lincoln, Lincoln, NE 68588, USA
Reed Scherer
Department of Earth, Atmosphere and Environment, Northern Illinois University, DeKalb, IL 60115, USA
Peter-Noel Webb
School of Earth Sciences, Ohio State University, Columbus, OH 43210, USA
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Sci. Dril., 35, 21–37, https://doi.org/10.5194/sd-35-21-2026, https://doi.org/10.5194/sd-35-21-2026, 2026
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Choosing samples from large sections of hard-rock cores often relies on preliminary chemical analyses, which can be limited and therefore misrepresentative of full chemical variability. This study adapts X-ray fluorescence core-scanning techniques for use on hard-rock basalt cores to outline a method that provides accurate chemical information in greater detail relative to traditional analytical methods. The presented workflow suggests significant contributions to new and legacy core research.
Samantha E. Bombard, R. Mark Leckie, Imogen M. Browne, Amelia E. Shevenell, Robert M. McKay, David M. Harwood, and the IODP Expedition 374 Scientists
J. Micropalaeontol., 43, 383–421, https://doi.org/10.5194/jm-43-383-2024, https://doi.org/10.5194/jm-43-383-2024, 2024
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The Ross Sea record of the Miocene Climatic Optimum (~16.9–14.7 Ma) and the Middle Miocene Climate Transition (~14.7–13.8 Ma) can provide critical insights into the Antarctic ocean–cryosphere system during an ancient time of extreme warmth and subsequent cooling. Benthic foraminifera inform us about water masses, currents, and glacial conditions in the Ross Sea, and planktic foram invaders can inform us of when warm waters melted the Antarctic Ice Sheet in the past.
Joseph A. Ruggiero, Reed P. Scherer, Joseph Mastro, Cesar G. Lopez, Marcus Angus, Evie Unger-Harquail, Olivia Quartz, Amy Leventer, and Claus-Dieter Hillenbrand
J. Micropalaeontol., 43, 323–336, https://doi.org/10.5194/jm-43-323-2024, https://doi.org/10.5194/jm-43-323-2024, 2024
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We quantify sea surface temperature (SST) in the past Southern Ocean using the diatom Fragilariopsis kerguelensis that displays variable population with SST. We explore the use of this relatively new proxy by applying it to sediment assemblages from the Sabrina Coast and Amundsen Sea. We find that Amundsen Sea and Sabrina Coast F. kerguelensis populations are different from each other. An understanding of F. kerguelensis dynamics may help us generate an SST proxy to apply to ancient sediments.
Heather Furlong and Reed Paul Scherer
J. Micropalaeontol., 43, 269–282, https://doi.org/10.5194/jm-43-269-2024, https://doi.org/10.5194/jm-43-269-2024, 2024
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Diatom assemblages are vital components of the Antarctic ecosystem and nutrient supply chain, and they are often utilized as paleoclimate proxies to better understand past climatic changes. We demonstrate enhanced diatom production and accumulation in the outer Amundsen Sea during a Mid-Pliocene interglacial that coincides with pulses of ice-rafted terrestrial debris, providing compelling evidence that iceberg calving seeds diatom productivity in the Southern Ocean.
Julia L. Seidenstein, R. Mark Leckie, Robert McKay, Laura De Santis, David Harwood, and IODP Expedition 374 Scientists
J. Micropalaeontol., 43, 211–238, https://doi.org/10.5194/jm-43-211-2024, https://doi.org/10.5194/jm-43-211-2024, 2024
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Warmer waters in the Southern Ocean have led to the loss of Antarctic ice during past interglacial times. The shells of foraminifera are preserved in Ross Sea sediment, which is collected in cores. Benthic species from Site U1523 inform us about changing water masses and current activity, including incursions of Circumpolar Deep Water. Warm water planktic species were found in sediment samples from four intervals within 3.72–1.82 million years ago, indicating warmer than present conditions.
Molly O. Patterson, Richard H. Levy, Denise K. Kulhanek, Tina van de Flierdt, Huw Horgan, Gavin B. Dunbar, Timothy R. Naish, Jeanine Ash, Alex Pyne, Darcy Mandeno, Paul Winberry, David M. Harwood, Fabio Florindo, Francisco J. Jimenez-Espejo, Andreas Läufer, Kyu-Cheul Yoo, Osamu Seki, Paolo Stocchi, Johann P. Klages, Jae Il Lee, Florence Colleoni, Yusuke Suganuma, Edward Gasson, Christian Ohneiser, José-Abel Flores, David Try, Rachel Kirkman, Daleen Koch, and the SWAIS 2C Science Team
Sci. Dril., 30, 101–112, https://doi.org/10.5194/sd-30-101-2022, https://doi.org/10.5194/sd-30-101-2022, 2022
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How much of the West Antarctic Ice Sheet will melt and how quickly it will happen when average global temperatures exceed 2 °C is currently unknown. Given the far-reaching and international consequences of Antarctica’s future contribution to global sea level rise, the SWAIS 2C Project was developed in order to better forecast the size and timing of future changes.
Sarah U. Neuhaus, Slawek M. Tulaczyk, Nathan D. Stansell, Jason J. Coenen, Reed P. Scherer, Jill A. Mikucki, and Ross D. Powell
The Cryosphere, 15, 4655–4673, https://doi.org/10.5194/tc-15-4655-2021, https://doi.org/10.5194/tc-15-4655-2021, 2021
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We estimate the timing of post-LGM grounding line retreat and readvance in the Ross Sea sector of Antarctica. Our analyses indicate that the grounding line retreated over our field sites within the past 5000 years (coinciding with a warming climate) and readvanced roughly 1000 years ago (coinciding with a cooling climate). Based on these results, we propose that the Siple Coast grounding line motions in the middle to late Holocene were driven by relatively modest changes in regional climate.
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Short summary
In 1977-79, the Ross Ice Shelf Project recovered ocean sediments ~ 450 km south of the present-day ice shelf calving front. Within these sediments are microfossils, which are used to recreate the history of the West Antarctic Ice Sheet (WAIS) and address how the ice sheet responded to past times of extreme warmth. The microfossils reveal the WAIS collapsed multiple times in the past 17 million years. These results inform predictions of future WAIS response to rising global temperatures.
In 1977-79, the Ross Ice Shelf Project recovered ocean sediments ~ 450 km south of the...
