气候变化领域集成服务门户(CCPortal): Widespread collapse of the Ross Ice Shelf during the late Holocene

CCPortal

DOI	10.1073/pnas.1516908113
	Widespread collapse of the Ross Ice Shelf during the late Holocene
	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.
发表日期	2016
ISSN	0027-8424
起始页码	2354
结束页码	2359
卷号	113 期号:9
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.
英文关键词	Antarctica; Ice sheet; Ice shelf; Radiocarbon; Ross Sea
语种	英语
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
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159080
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 K...
推荐引用方式 GB/T 7714	Yokoyama Y.,Anderson J.B.,Yamane M.,et al. Widespread collapse of the Ross Ice Shelf during the late Holocene[J],2016,113(9).
APA	Yokoyama Y..,Anderson J.B..,Yamane M..,Simkins L.M..,Miyairi Y..,...&Ohkouchi N..(2016).Widespread collapse of the Ross Ice Shelf during the late Holocene.Proceedings of the National Academy of Sciences of the United States of America,113(9).
MLA	Yokoyama Y.,et al."Widespread collapse of the Ross Ice Shelf during the late Holocene".Proceedings of the National Academy of Sciences of the United States of America 113.9(2016).