An Arctic Ocean ice shelf during MIS 6 constrained by new geophysical and geological data
The hypothesis of floating ice shelves covering the Arctic Ocean during glacial periods was developed in the 1970s. In its most extreme form, this theory involved a 1000 m thick continuous ice shelf covering the Arctic Ocean during Quaternary glacial maxima including the Last Glacial Maximum (LGM)....
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Online Access: | https://orca.cardiff.ac.uk/id/eprint/7543/ https://doi.org/10.1016/j.quascirev.2010.03.015 |
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ftunivcardiff:oai:https://orca.cardiff.ac.uk:7543 2023-05-15T14:27:26+02:00 An Arctic Ocean ice shelf during MIS 6 constrained by new geophysical and geological data Jakobsson, M. Nilsson, J. O'Regan, Matthew Backman, J. Lowemark, L. Dowdeswell, J. A. Mayer, L. Polyak, L. Colleoni, F. Anderson, L. G. Bjork, G. Darby, D. Eriksson, B. Hanslik, D. Hell, B. Marcussen, C. Sellen, E. Wallin, A. 2010-12 https://orca.cardiff.ac.uk/id/eprint/7543/ https://doi.org/10.1016/j.quascirev.2010.03.015 unknown Jakobsson, M., Nilsson, J., O'Regan, Matthew, Backman, J., Lowemark, L., Dowdeswell, J. A., Mayer, L., Polyak, L., Colleoni, F., Anderson, L. G., Bjork, G., Darby, D., Eriksson, B., Hanslik, D., Hell, B., Marcussen, C., Sellen, E. and Wallin, A. 2010. An Arctic Ocean ice shelf during MIS 6 constrained by new geophysical and geological data. Quaternary Science Reviews 29 (25-26) , pp. 3505-3517. 10.1016/j.quascirev.2010.03.015 https://doi.org/10.1016/j.quascirev.2010.03.015 doi:10.1016/j.quascirev.2010.03.015 QE Geology Article PeerReviewed 2010 ftunivcardiff https://doi.org/10.1016/j.quascirev.2010.03.015 2022-09-25T20:16:07Z The hypothesis of floating ice shelves covering the Arctic Ocean during glacial periods was developed in the 1970s. In its most extreme form, this theory involved a 1000 m thick continuous ice shelf covering the Arctic Ocean during Quaternary glacial maxima including the Last Glacial Maximum (LGM). While recent observations clearly demonstrate deep ice grounding events in the central Arctic Ocean, the ice shelf hypothesis has been difficult to evaluate due to a lack of information from key areas with severe sea ice conditions. Here we present new data from previously inaccessible, unmapped areas that constrain the spatial extent and timing of marine ice sheets during past glacials. These data include multibeam swath bathymetry and subbottom profiles portraying glaciogenic features on the Chukchi Borderland, southern Lomonosov Ridge north of Greenland, Morris Jesup Rise, and Yermak Plateau. Sediment cores from the mapped areas provide age constraints on the glaciogenic features. Combining these new geophysical and geological data with earlier results suggests that an especially extensive marine ice sheet complex, including an ice shelf, existed in the Amerasian Arctic Ocean during Marine Isotope Stage (MIS) 6. From a conceptual oceanographic model we speculate that the cold halocline of the Polar Surface Water may have extended to deeper water depths during MIS 6 inhibiting the warm Atlantic water from reaching the Amerasian Arctic Ocean and, thus, creating favorable conditions for ice shelf development. The hypothesis of a continuous 1000 m thick ice shelf is rejected because our mapping results show that several areas in the central Arctic Ocean substantially shallower than 1000 m water depth are free from glacial influence on the seafloor. Article in Journal/Newspaper Arctic Arctic Arctic Ocean Chukchi Greenland Ice Sheet Ice Shelf Ice Shelves Lomonosov Ridge Sea ice Yermak plateau Cardiff University: ORCA (Online Research @ Cardiff) Arctic Arctic Ocean Greenland Yermak Plateau ENVELOPE(5.000,5.000,81.250,81.250) Morris Jesup Rise ENVELOPE(-20.000,-20.000,83.750,83.750) Chukchi Borderland ENVELOPE(-165.000,-165.000,77.000,77.000) Quaternary Science Reviews 29 25-26 3505 3517 |
institution |
Open Polar |
collection |
Cardiff University: ORCA (Online Research @ Cardiff) |
op_collection_id |
ftunivcardiff |
language |
unknown |
topic |
QE Geology |
spellingShingle |
QE Geology Jakobsson, M. Nilsson, J. O'Regan, Matthew Backman, J. Lowemark, L. Dowdeswell, J. A. Mayer, L. Polyak, L. Colleoni, F. Anderson, L. G. Bjork, G. Darby, D. Eriksson, B. Hanslik, D. Hell, B. Marcussen, C. Sellen, E. Wallin, A. An Arctic Ocean ice shelf during MIS 6 constrained by new geophysical and geological data |
topic_facet |
QE Geology |
description |
The hypothesis of floating ice shelves covering the Arctic Ocean during glacial periods was developed in the 1970s. In its most extreme form, this theory involved a 1000 m thick continuous ice shelf covering the Arctic Ocean during Quaternary glacial maxima including the Last Glacial Maximum (LGM). While recent observations clearly demonstrate deep ice grounding events in the central Arctic Ocean, the ice shelf hypothesis has been difficult to evaluate due to a lack of information from key areas with severe sea ice conditions. Here we present new data from previously inaccessible, unmapped areas that constrain the spatial extent and timing of marine ice sheets during past glacials. These data include multibeam swath bathymetry and subbottom profiles portraying glaciogenic features on the Chukchi Borderland, southern Lomonosov Ridge north of Greenland, Morris Jesup Rise, and Yermak Plateau. Sediment cores from the mapped areas provide age constraints on the glaciogenic features. Combining these new geophysical and geological data with earlier results suggests that an especially extensive marine ice sheet complex, including an ice shelf, existed in the Amerasian Arctic Ocean during Marine Isotope Stage (MIS) 6. From a conceptual oceanographic model we speculate that the cold halocline of the Polar Surface Water may have extended to deeper water depths during MIS 6 inhibiting the warm Atlantic water from reaching the Amerasian Arctic Ocean and, thus, creating favorable conditions for ice shelf development. The hypothesis of a continuous 1000 m thick ice shelf is rejected because our mapping results show that several areas in the central Arctic Ocean substantially shallower than 1000 m water depth are free from glacial influence on the seafloor. |
format |
Article in Journal/Newspaper |
author |
Jakobsson, M. Nilsson, J. O'Regan, Matthew Backman, J. Lowemark, L. Dowdeswell, J. A. Mayer, L. Polyak, L. Colleoni, F. Anderson, L. G. Bjork, G. Darby, D. Eriksson, B. Hanslik, D. Hell, B. Marcussen, C. Sellen, E. Wallin, A. |
author_facet |
Jakobsson, M. Nilsson, J. O'Regan, Matthew Backman, J. Lowemark, L. Dowdeswell, J. A. Mayer, L. Polyak, L. Colleoni, F. Anderson, L. G. Bjork, G. Darby, D. Eriksson, B. Hanslik, D. Hell, B. Marcussen, C. Sellen, E. Wallin, A. |
author_sort |
Jakobsson, M. |
title |
An Arctic Ocean ice shelf during MIS 6 constrained by new geophysical and geological data |
title_short |
An Arctic Ocean ice shelf during MIS 6 constrained by new geophysical and geological data |
title_full |
An Arctic Ocean ice shelf during MIS 6 constrained by new geophysical and geological data |
title_fullStr |
An Arctic Ocean ice shelf during MIS 6 constrained by new geophysical and geological data |
title_full_unstemmed |
An Arctic Ocean ice shelf during MIS 6 constrained by new geophysical and geological data |
title_sort |
arctic ocean ice shelf during mis 6 constrained by new geophysical and geological data |
publishDate |
2010 |
url |
https://orca.cardiff.ac.uk/id/eprint/7543/ https://doi.org/10.1016/j.quascirev.2010.03.015 |
long_lat |
ENVELOPE(5.000,5.000,81.250,81.250) ENVELOPE(-20.000,-20.000,83.750,83.750) ENVELOPE(-165.000,-165.000,77.000,77.000) |
geographic |
Arctic Arctic Ocean Greenland Yermak Plateau Morris Jesup Rise Chukchi Borderland |
geographic_facet |
Arctic Arctic Ocean Greenland Yermak Plateau Morris Jesup Rise Chukchi Borderland |
genre |
Arctic Arctic Arctic Ocean Chukchi Greenland Ice Sheet Ice Shelf Ice Shelves Lomonosov Ridge Sea ice Yermak plateau |
genre_facet |
Arctic Arctic Arctic Ocean Chukchi Greenland Ice Sheet Ice Shelf Ice Shelves Lomonosov Ridge Sea ice Yermak plateau |
op_relation |
Jakobsson, M., Nilsson, J., O'Regan, Matthew, Backman, J., Lowemark, L., Dowdeswell, J. A., Mayer, L., Polyak, L., Colleoni, F., Anderson, L. G., Bjork, G., Darby, D., Eriksson, B., Hanslik, D., Hell, B., Marcussen, C., Sellen, E. and Wallin, A. 2010. An Arctic Ocean ice shelf during MIS 6 constrained by new geophysical and geological data. Quaternary Science Reviews 29 (25-26) , pp. 3505-3517. 10.1016/j.quascirev.2010.03.015 https://doi.org/10.1016/j.quascirev.2010.03.015 doi:10.1016/j.quascirev.2010.03.015 |
op_doi |
https://doi.org/10.1016/j.quascirev.2010.03.015 |
container_title |
Quaternary Science Reviews |
container_volume |
29 |
container_issue |
25-26 |
container_start_page |
3505 |
op_container_end_page |
3517 |
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1766301161580658688 |