Deglacial grounding-line retreat in the Ross Embayment, Antarctica, controlled by ocean and atmosphere forcing
Oceanic and atmospheric warming were dominant controls of past ice sheet retreat in Antarctica’s largest catchment. Modern observations appear to link warming oceanic conditions with Antarctic ice sheet grounding-line retreat. Yet, interpretations of past ice sheet retreat over the last deglaciation...
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| Vydané v: | Science advances Ročník 5; číslo 8; s. eaav8754 |
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| Hlavní autori: | , , , , |
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| Jazyk: | English |
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United States
American Association for the Advancement of Science
01.08.2019
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| ISSN: | 2375-2548, 2375-2548 |
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| Abstract | Oceanic and atmospheric warming were dominant controls of past ice sheet retreat in Antarctica’s largest catchment.
Modern observations appear to link warming oceanic conditions with Antarctic ice sheet grounding-line retreat. Yet, interpretations of past ice sheet retreat over the last deglaciation in the Ross Embayment, Antarctica’s largest catchment, differ considerably and imply either extremely high or very low sensitivity to environmental forcing. To investigate this, we perform regional ice sheet simulations using a wide range of atmosphere and ocean forcings. Constrained by marine and terrestrial geological data, these models predict earliest retreat in the central embayment and rapid terrestrial ice sheet thinning during the Early Holocene. We find that atmospheric conditions early in the deglacial period can enhance or diminish ice sheet sensitivity to rising ocean temperatures, thereby controlling the initial timing and spatial pattern of grounding-line retreat. Through the Holocene, however, grounding-line position is much more sensitive to subshelf melt rates, implicating ocean thermal forcing as the key driver of past ice sheet retreat. |
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| AbstractList | Modern observations appear to link warming oceanic conditions with Antarctic ice sheet grounding-line retreat. Yet, interpretations of past ice sheet retreat over the last deglaciation in the Ross Embayment, Antarctica's largest catchment, differ considerably and imply either extremely high or very low sensitivity to environmental forcing. To investigate this, we perform regional ice sheet simulations using a wide range of atmosphere and ocean forcings. Constrained by marine and terrestrial geological data, these models predict earliest retreat in the central embayment and rapid terrestrial ice sheet thinning during the Early Holocene. We find that atmospheric conditions early in the deglacial period can enhance or diminish ice sheet sensitivity to rising ocean temperatures, thereby controlling the initial timing and spatial pattern of grounding-line retreat. Through the Holocene, however, grounding-line position is much more sensitive to subshelf melt rates, implicating ocean thermal forcing as the key driver of past ice sheet retreat.Modern observations appear to link warming oceanic conditions with Antarctic ice sheet grounding-line retreat. Yet, interpretations of past ice sheet retreat over the last deglaciation in the Ross Embayment, Antarctica's largest catchment, differ considerably and imply either extremely high or very low sensitivity to environmental forcing. To investigate this, we perform regional ice sheet simulations using a wide range of atmosphere and ocean forcings. Constrained by marine and terrestrial geological data, these models predict earliest retreat in the central embayment and rapid terrestrial ice sheet thinning during the Early Holocene. We find that atmospheric conditions early in the deglacial period can enhance or diminish ice sheet sensitivity to rising ocean temperatures, thereby controlling the initial timing and spatial pattern of grounding-line retreat. Through the Holocene, however, grounding-line position is much more sensitive to subshelf melt rates, implicating ocean thermal forcing as the key driver of past ice sheet retreat. Oceanic and atmospheric warming were dominant controls of past ice sheet retreat in Antarctica’s largest catchment. Modern observations appear to link warming oceanic conditions with Antarctic ice sheet grounding-line retreat. Yet, interpretations of past ice sheet retreat over the last deglaciation in the Ross Embayment, Antarctica’s largest catchment, differ considerably and imply either extremely high or very low sensitivity to environmental forcing. To investigate this, we perform regional ice sheet simulations using a wide range of atmosphere and ocean forcings. Constrained by marine and terrestrial geological data, these models predict earliest retreat in the central embayment and rapid terrestrial ice sheet thinning during the Early Holocene. We find that atmospheric conditions early in the deglacial period can enhance or diminish ice sheet sensitivity to rising ocean temperatures, thereby controlling the initial timing and spatial pattern of grounding-line retreat. Through the Holocene, however, grounding-line position is much more sensitive to subshelf melt rates, implicating ocean thermal forcing as the key driver of past ice sheet retreat. Modern observations appear to link warming oceanic conditions with Antarctic ice sheet grounding-line retreat. Yet, interpretations of past ice sheet retreat over the last deglaciation in the Ross Embayment, Antarctica's largest catchment, differ considerably and imply either extremely high or very low sensitivity to environmental forcing. To investigate this, we perform regional ice sheet simulations using a wide range of atmosphere and ocean forcings. Constrained by marine and terrestrial geological data, these models predict earliest retreat in the central embayment and rapid terrestrial ice sheet thinning during the Early Holocene. We find that atmospheric conditions early in the deglacial period can enhance or diminish ice sheet sensitivity to rising ocean temperatures, thereby controlling the initial timing and spatial pattern of grounding-line retreat. Through the Holocene, however, grounding-line position is much more sensitive to subshelf melt rates, implicating ocean thermal forcing as the key driver of past ice sheet retreat. Oceanic and atmospheric warming were dominant controls of past ice sheet retreat in Antarctica’s largest catchment. Modern observations appear to link warming oceanic conditions with Antarctic ice sheet grounding-line retreat. Yet, interpretations of past ice sheet retreat over the last deglaciation in the Ross Embayment, Antarctica’s largest catchment, differ considerably and imply either extremely high or very low sensitivity to environmental forcing. To investigate this, we perform regional ice sheet simulations using a wide range of atmosphere and ocean forcings. Constrained by marine and terrestrial geological data, these models predict earliest retreat in the central embayment and rapid terrestrial ice sheet thinning during the Early Holocene. We find that atmospheric conditions early in the deglacial period can enhance or diminish ice sheet sensitivity to rising ocean temperatures, thereby controlling the initial timing and spatial pattern of grounding-line retreat. Through the Holocene, however, grounding-line position is much more sensitive to subshelf melt rates, implicating ocean thermal forcing as the key driver of past ice sheet retreat. |
| Author | McKay, Robert Lowry, Daniel P. Jones, R. Selwyn Bertler, Nancy A. N. Golledge, Nicholas R. |
| Author_xml | – sequence: 1 givenname: Daniel P. orcidid: 0000-0002-9668-0850 surname: Lowry fullname: Lowry, Daniel P. organization: Antarctic Research Centre, Victoria University of Wellington, Wellington 6012, New Zealand – sequence: 2 givenname: Nicholas R. orcidid: 0000-0001-7676-8970 surname: Golledge fullname: Golledge, Nicholas R. organization: Antarctic Research Centre, Victoria University of Wellington, Wellington 6012, New Zealand., GNS Science, Lower Hutt 5010, New Zealand – sequence: 3 givenname: Nancy A. N. orcidid: 0000-0001-6028-4891 surname: Bertler fullname: Bertler, Nancy A. N. organization: Antarctic Research Centre, Victoria University of Wellington, Wellington 6012, New Zealand., GNS Science, Lower Hutt 5010, New Zealand – sequence: 4 givenname: R. Selwyn orcidid: 0000-0003-2988-0999 surname: Jones fullname: Jones, R. Selwyn organization: Department of Geography, Durham University, Durham DH1 3LE, UK – sequence: 5 givenname: Robert orcidid: 0000-0002-5602-6985 surname: McKay fullname: McKay, Robert organization: Antarctic Research Centre, Victoria University of Wellington, Wellington 6012, New Zealand |
| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/31565668$$D View this record in MEDLINE/PubMed |
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| Snippet | Oceanic and atmospheric warming were dominant controls of past ice sheet retreat in Antarctica’s largest catchment.
Modern observations appear to link warming... Modern observations appear to link warming oceanic conditions with Antarctic ice sheet grounding-line retreat. Yet, interpretations of past ice sheet retreat... Oceanic and atmospheric warming were dominant controls of past ice sheet retreat in Antarctica’s largest catchment. Modern observations appear to link warming... |
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| Title | Deglacial grounding-line retreat in the Ross Embayment, Antarctica, controlled by ocean and atmosphere forcing |
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