气候变化领域集成服务门户(CCPortal): Kinematic response of ice-rise divides to changes in ocean and atmosphere forcing

CCPortal

DOI	10.5194/tc-13-2673-2019
	Kinematic response of ice-rise divides to changes in ocean and atmosphere forcing
	Schannwell C.; Drews R.; Ehlers T.A.; Eisen O.; Mayer C.; Gillet-Chaulet F.
发表日期	2019
ISSN	19940416
EISSN	13
起始页码	2673
结束页码	2691
卷号	13 期号:10
英文摘要	The majority of Antarctic ice shelves are bounded by grounded ice rises. These ice rises exhibit local flow fields that partially oppose the flow of the surrounding ice shelves. Formation of ice rises is accompanied by a characteristic upward-arching internal stratigraphy ("Raymond arches"), whose geometry can be analysed to infer information about past ice-sheet changes in areas where other archives such as rock outcrops are missing. Here we present an improved modelling framework to study ice-rise evolution using a satellite-velocity calibrated, isothermal, and isotropic 3-D full-Stokes model including grounding-line dynamics at the required mesh resolution (<500 m). This overcomes limitations of previous studies where ice-rise modelling has been restricted to 2-D and excluded the coupling between the ice shelf and ice rise. We apply the model to the Ekström Ice Shelf, Antarctica, containing two ice rises. Our simulations investigate the effect of surface mass balance and ocean perturbations onto ice-rise divide position and interpret possible resulting unique Raymond arch geometries. Our results show that changes in the surface mass balance result in immediate and sustained divide migration (> 2:0m yr-1) of up to 3.5 km. In contrast, instantaneous ice-shelf disintegration causes a short-lived and delayed (by 60-100 years) response of smaller magnitude (< 0:75m yr-1). The model tracks migration of a triple junction and synchronous ice-divide migration in both ice rises with similar magnitude but differing rates. The model is suitable for glacial/interglacial simulations on the catchment scale, providing the next step forward to unravel the ice-dynamic history stored in ice rises all around Antarctica. © 2019 Author(s).
学科领域	atmosphere-ice-ocean system; atmosphere-ocean coupling; atmospheric forcing; ice core; ice cover; ice sheet; ice shelf; ice-dammed lake; ice-ocean interaction; Antarctica; East Antarctica; Ekstrom Ice Shelf
语种	英语
scopus关键词	atmosphere-ice-ocean system; atmosphere-ocean coupling; atmospheric forcing; ice core; ice cover; ice sheet; ice shelf; ice-dammed lake; ice-ocean interaction; Antarctica; East Antarctica; Ekstrom Ice Shelf
来源期刊	The Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/118825
作者单位	Department of Geosciences, University of Tübingen, Tübingen, Germany; Glaciology, Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany; Department of Geosciences, University of Bremen, Bremen, Germany; Bavarian Academy for Sciences and Humanities, Munich, Germany; Univ. Grenoble Alpes, CNRS, IRD, Grenoble INP, IGE, Grenoble, France
推荐引用方式 GB/T 7714	Schannwell C.,Drews R.,Ehlers T.A.,et al. Kinematic response of ice-rise divides to changes in ocean and atmosphere forcing[J],2019,13(10).
APA	Schannwell C.,Drews R.,Ehlers T.A.,Eisen O.,Mayer C.,&Gillet-Chaulet F..(2019).Kinematic response of ice-rise divides to changes in ocean and atmosphere forcing.The Cryosphere,13(10).
MLA	Schannwell C.,et al."Kinematic response of ice-rise divides to changes in ocean and atmosphere forcing".The Cryosphere 13.10(2019).