气候变化领域集成服务门户(CCPortal): Imminent calving accelerated by increased instability of the Brunt Ice Shelf, in response to climate warming

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DOI	10.1016/j.epsl.2021.117132
	Imminent calving accelerated by increased instability of the Brunt Ice Shelf, in response to climate warming
	Cheng Y.; Xia M.; Qiao G.; Lv D.; Li Y.; Hai G.
发表日期	2021
ISSN	0012821X
卷号	572
英文摘要	Ice shelves in the Southern Weddell Sea have large areas and volumes, and have previously been stable due to their setting in a region of cold near-surface and sub-surface ocean water. The Brunt Ice Shelf (BIS), one of the ice shelves closest to the continental shelf break in the region, just released an iceberg with an area of ∼1,270 km2 in late February 2021 and another large calving event is imminent. However, recent changes in the BIS, since 2017, have not been studied to date. In this study, we used multi-source remote sensing data (including satellite images, ice flow velocity products, digital elevation models, and altimetry data) to conclude that the instability of the ice shelf has been increasing. The increased instability is manifested by rapidly increasing ice flow velocity and the propagation rate of full-thickness rifts. The velocity at the front of the BIS accelerated by more than doubled from 2013–2021, and the width of Chasm 1 increased by almost three-fold from 2012–2021. Based on the expansion of Chasm 1 and the strain rate changes, an iceberg with an area of ∼1,675 km2 is predicted to be released from the BIS during October 2022. We used meteorological data, ocean synthesis, and field observations to attribute the increased instability of the BIS to warm inflow onto the continental shelf, which emphasizes the importance of further observation and analysis. Additionally, owing to its special location, the BIS could be an indicator of the evolution of other ice shelves in the Southern Weddell Sea. © 2021 Elsevier B.V.
关键词	Antarctica Brunt Ice Shelf glacier dynamics iceberg calving remote sensing rifts
英文关键词	Flow velocity; Sea ice; Stability; Strain rate; Antarctica; Brunt ice shelves; Climate warming; Continental shelfs; Glacier dynamics; Ice flow; Ice shelves; Iceberg calfing; Remote-sensing; Rift; Remote sensing
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203056
作者单位	Center for Spatial Information Science and Sustainable Development Applications, Tongji University, 1239 Siping Road, Shanghai, China; College of Surveying and Geo-Informatics, Tongji University, 1239 Siping Road, Shanghai, China
推荐引用方式 GB/T 7714	Cheng Y.,Xia M.,Qiao G.,et al. Imminent calving accelerated by increased instability of the Brunt Ice Shelf, in response to climate warming[J],2021,572.
APA	Cheng Y.,Xia M.,Qiao G.,Lv D.,Li Y.,&Hai G..(2021).Imminent calving accelerated by increased instability of the Brunt Ice Shelf, in response to climate warming.Earth and Planetary Science Letters,572.
MLA	Cheng Y.,et al."Imminent calving accelerated by increased instability of the Brunt Ice Shelf, in response to climate warming".Earth and Planetary Science Letters 572(2021).