globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1516908113
论文题名:
Widespread collapse of the Ross Ice Shelf during the late Holocene
作者: Yokoyama Y.; Anderson J.B.; Yamane M.; Simkins L.M.; Miyairi Y.; Yamazaki T.; Koizumi M.; Suga H.; Kusahara K.; Prothro L.; Hasumi H.; Southon J.R.; Ohkouchi N.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2016
卷: 113, 期:9
起始页码: 2354
结束页码: 2359
语种: 英语
英文关键词: Antarctica ; Ice sheet ; Ice shelf ; Radiocarbon ; Ross Sea
Scopus关键词: beryllium ; carbon 14 ; Article ; atmosphere ; climate ; collapse ; concentration (parameters) ; continental shelf ; ice shelf ; last glacial maximum ; Late Holocene ; marine environment ; priority journal ; sediment ; warming
英文摘要: The stability of modern ice shelves is threatened by atmospheric and oceanic warming. The geologic record of formerly glaciated continental shelves provides a window into the past of how ice shelves responded to a warming climate. Fields of deep (-560 m), linear iceberg furrows on the outer, western Ross Sea continental shelf record an early post-Last Glacial Maximum episode of ice-shelf collapse that was followed by continuous retreat of the grounding line for ∼200 km. Runaway grounding line conditions culminated once the ice became pinned on shallow banks in the western Ross Sea. This early episode of ice-shelf collapse is not observed in the eastern Ross Sea, where more episodic grounding line retreat took place. More widespread (∼280,000 km2) retreat of the ancestral Ross Ice Shelf occurred during the late Holocene. This event is recorded in sediment cores by a shift from terrigenous glacimarine mud to diatomaceous open-marine sediment as well as an increase in radiogenic beryllium (10Be) concentrations. The timing of ice-shelf breakup is constrained by compound specific radiocarbon ages, the first application of this technique systematically applied to Antarctic marine sediments. Breakup initiated around 5 ka, with the ice shelf reaching its current configuration ∼1.5 ka. In the eastern Ross Sea, the ice shelf retreated up to 100 km in about a thousand years. Three-dimensional thermodynamic ice-shelf/ocean modeling results and comparison with ice-core records indicate that ice-shelf breakup resulted from combined atmospheric warming and warm ocean currents impinging onto the continental shelf. © 2016, National Academy of Sciences. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162342
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作者单位: Yokoyama, Y., Atmosphere and Ocean Research Institute, University of Tokyo, 5-1-5 Kashiwa-no-ha, Kashiwa, 275-8564, Japan, Department of Earth and Planetary Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, Department of Biogeochemistry, Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-cho, Yokosuka, 237-0061, Japan; Anderson, J.B., Department of Earth Science, Rice University, Houston, TX 77005, United States; Yamane, M., Atmosphere and Ocean Research Institute, University of Tokyo, 5-1-5 Kashiwa-no-ha, Kashiwa, 275-8564, Japan, Department of Biogeochemistry, Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-cho, Yokosuka, 237-0061, Japan; Simkins, L.M., Department of Earth Science, Rice University, Houston, TX 77005, United States; Miyairi, Y., Atmosphere and Ocean Research Institute, University of Tokyo, 5-1-5 Kashiwa-no-ha, Kashiwa, 275-8564, Japan; Yamazaki, T., Atmosphere and Ocean Research Institute, University of Tokyo, 5-1-5 Kashiwa-no-ha, Kashiwa, 275-8564, Japan, Department of Earth and Planetary Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan; Koizumi, M., Atmosphere and Ocean Research Institute, University of Tokyo, 5-1-5 Kashiwa-no-ha, Kashiwa, 275-8564, Japan, Department of Earth and Planetary Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan; Suga, H., Department of Biogeochemistry, Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-cho, Yokosuka, 237-0061, Japan; Kusahara, K., Antarctic Climate and Ecosystems Cooperative Research Centre, Hobart, TAS 7001, Australia; Prothro, L., Department of Earth Science, Rice University, Houston, TX 77005, United States; Hasumi, H., Atmosphere and Ocean Research Institute, University of Tokyo, 5-1-5 Kashiwa-no-ha, Kashiwa, 275-8564, Japan; Southon, J.R., Department of Earth System Science, University of California, Irvine, CA 92697, United States; Ohkouchi, N., Department of Biogeochemistry, Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-cho, Yokosuka, 237-0061, Japan

Recommended Citation:
Yokoyama Y.,Anderson J.B.,Yamane M.,et al. Widespread collapse of the Ross Ice Shelf during the late Holocene[J]. Proceedings of the National Academy of Sciences of the United States of America,2016-01-01,113(9)
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