气候变化领域集成服务门户(CCPortal): Spatial and temporal distributions of surface mass balance between Concordia and Vostok stations, Antarctica, from combined radar and ice core data: First results and detailed error analysis

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DOI	10.5194/tc-12-1831-2018
	Spatial and temporal distributions of surface mass balance between Concordia and Vostok stations, Antarctica, from combined radar and ice core data: First results and detailed error analysis
	Le Meur E.; Magand O.; Arnaud L.; Fily M.; Frezzotti M.; Cavitte M.; Mulvaney R.; Urbini S.
发表日期	2018
ISSN	19940416
卷号	12 期号:5
英文摘要	Results from ground-penetrating radar (GPR) measurements and shallow ice cores carried out during a scientific traverse between Dome Concordia (DC) and Vostok stations are presented in order to infer both spatial and temporal characteristics of snow accumulation over the East Antarctic Plateau. Spatially continuous accumulation rates along the traverse are computed from the identification of three equally spaced radar reflections spanning about the last 600 years. Accurate dating of these internal reflection horizons (IRHs) is obtained from a depth-age relationship derived from volcanic horizons and bomb testing fallouts on a DC ice core and shows a very good consistency when tested against extra ice cores drilled along the radar profile. Accumulation rates are then inferred by accounting for density profiles down to each IRH. For the latter purpose, a careful error analysis showed that using a single and more accurate density profile along a DC core provided more reliable results than trying to include the potential spatial variability in density from extra (but less accurate) ice cores distributed along the profile. The most striking feature is an accumulation pattern that remains constant through time with persistent gradients such as a marked decrease from 26 mm w.e. yr-1 at DC to 20 mm w.e. yr-1 at the south-west end of the profile over the last 234 years on average (with a similar decrease from 25 to 19 mm w.e. yr-1 over the last 592 years). As for the time dependency, despite an overall consistency with similar measurements carried out along the main East Antarctic divides, interpreting possible trends remains difficult. Indeed, error bars in our measurements are still too large to unambiguously infer an apparent time increase in accumulation rate. For the proposed absolute values, maximum margins of error are in the range 4 mm w.e. yr-1 (last 234 years) to 2 mm w.e. yr-1 (last 592 years), a decrease with depth mainly resulting from the time-averaging when computing accumulation rates. © 2018 Author(s).
学科领域	error analysis; glacier mass balance; ground penetrating radar; ice core; mass balance; radar; snow accumulation; spatial distribution; spatial variation; spatiotemporal analysis; Antarctica; Concordia Station; Dome Concordia; East Antarctica; Vostok Station
语种	英语
scopus关键词	error analysis; glacier mass balance; ground penetrating radar; ice core; mass balance; radar; snow accumulation; spatial distribution; spatial variation; spatiotemporal analysis; Antarctica; Concordia Station; Dome Concordia; East Antarctica; Vostok Station
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119141
作者单位	University Grenoble Alpes, CNRS, IGE, Grenoble, France; ENEA, Agenzia Nazionale per le Nuove Tecnologie, l'Energia e Lo Sviluppo Sostenibile, Rome, Italy; Institute for Geophysics, University of Texas, Austin, TX, United States; British Antarctic Survey, Cambridge, United Kingdom; Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy
推荐引用方式 GB/T 7714	Le Meur E.,Magand O.,Arnaud L.,et al. Spatial and temporal distributions of surface mass balance between Concordia and Vostok stations, Antarctica, from combined radar and ice core data: First results and detailed error analysis[J],2018,12(5).
APA	Le Meur E..,Magand O..,Arnaud L..,Fily M..,Frezzotti M..,...&Urbini S..(2018).Spatial and temporal distributions of surface mass balance between Concordia and Vostok stations, Antarctica, from combined radar and ice core data: First results and detailed error analysis.Cryosphere,12(5).
MLA	Le Meur E.,et al."Spatial and temporal distributions of surface mass balance between Concordia and Vostok stations, Antarctica, from combined radar and ice core data: First results and detailed error analysis".Cryosphere 12.5(2018).