气候变化领域集成服务门户(CCPortal): Multi-tracer study of gas trapping in an East Antarctic ice core

CCPortal

DOI	10.5194/tc-13-3383-2019
	Multi-tracer study of gas trapping in an East Antarctic ice core
	Fourteau K.; Martinerie P.; Faïn X.; Schaller C.F.; Tuckwell R.J.; Löwe H.; Arnaud L.; Magand O.; Thomas E.R.; Freitag J.; Mulvaney R.; Schneebeli M.; Lipenkov V.Ya.
发表日期	2019
ISSN	19940416
EISSN	13
起始页码	3383
结束页码	3403
卷号	13 期号:12
英文摘要	We study a firn and ice core drilled at the new "Lock-In" site in East Antarctica, located 136& km away from Concordia station towards Dumont d'Urville. High-resolution chemical and physical measurements were performed on the core, with a particular focus on the trapping zone of the firn where air bubbles are formed. We measured the air content in the ice, closed and open porous volumes in the firn, firn density, firn liquid conductivity, major ion concentrations, and methane concentrations in the ice. The closed and open porosity volumes of firn samples were obtained using the two independent methods of pycnometry and tomography, which yield similar results. The measured increase in the closed porosity with density is used to estimate the air content trapped in the ice with the aid of a simple gas-trapping model. Results show a discrepancy, with the model trapping too much air. Experimental errors have been considered but do not explain the discrepancy between the model and the observations. The model and data can be reconciled with the introduction of a reduced compression of the closed porosity compared to the open porosity. Yet, it is not clear if this limited compression of closed pores is the actual mechanism responsible for the low amount of air in the ice. High-resolution density measurements reveal the presence of strong layering, manifesting itself as centimeter-scale variations. Despite this heterogeneous stratification, all layers, including the ones that are especially dense or less dense compared to their surroundings, display similar pore morphology and closed porosity as a function of density. This implies that all layers close in a similar way, even though some close in advance or later compared to the bulk firn. Investigation of the chemistry data suggests that in the trapping zone, the observed stratification is partly related to the presence of chemical impurities. © 2019 Institute of Electrical and Electronics Engineers Inc.. All rights reserved.
学科领域	ice core; methane; physicochemical property; porosity; stratification; tracer; trapping; Argentina; Concordia; Dumont dUrville; Entre Rios
语种	英语
scopus关键词	ice core; methane; physicochemical property; porosity; stratification; tracer; trapping; Argentina; Concordia; Dumont dUrville; Entre Rios
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/118791
作者单位	Univ. Grenoble Alpes, CNRS, IRD, Grenoble INP, IGE, Grenoble, 38000, France; Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, 27568, Germany; British Antarctic Survey, Natural Environment Research Council, Cambridge, United Kingdom; WSL Institute for Snow and Avalanche Research (SLF), Davos Dorf, 7260, Switzerland; Climate and Environmental Research Laboratory, Arctic and Antarctic Research Institute, St. Petersburg, 199397, Russian Federation
推荐引用方式 GB/T 7714	Fourteau K.,Martinerie P.,Faïn X.,et al. Multi-tracer study of gas trapping in an East Antarctic ice core[J],2019,13(12).
APA	Fourteau K..,Martinerie P..,Faïn X..,Schaller C.F..,Tuckwell R.J..,...&Lipenkov V.Ya..(2019).Multi-tracer study of gas trapping in an East Antarctic ice core.The Cryosphere,13(12).
MLA	Fourteau K.,et al."Multi-tracer study of gas trapping in an East Antarctic ice core".The Cryosphere 13.12(2019).