气候变化领域集成服务门户(CCPortal): Acquisition of isotopic composition for surface snow in East Antarctica and the links to climatic parameters

CCPortal

DOI	10.5194/tc-10-837-2016
	Acquisition of isotopic composition for surface snow in East Antarctica and the links to climatic parameters
	Touzeau A.; Landais A.; Stenni B.; Uemura R.; Fukui K.; Fujita S.; Guilbaud S.; Ekaykin A.; Casado M.; Barkan E.; Luz B.; Magand O.; Teste G.; Le Meur E.; Baroni M.; Savarino J.; Bourgeois I.; Risi C.
发表日期	2016
ISSN	19940416
卷号	10 期号:2
英文摘要	The isotopic compositions of oxygen and hydrogen in ice cores are invaluable tools for the reconstruction of past climate variations. Used alone, they give insights into the variations of the local temperature, whereas taken together they can provide information on the climatic conditions at the point of origin of the moisture. However, recent analyses of snow from shallow pits indicate that the climatic signal can become erased in very low accumulation regions, due to local processes of snow reworking. The signal-to-noise ratio decreases and the climatic signal can then only be retrieved using stacks of several snow pits. Obviously, the signal is not completely lost at this stage, otherwise it would be impossible to extract valuable climate information from ice cores as has been done, for instance, for the last glaciation. To better understand how the climatic signal is passed from the precipitation to the snow, we present here results from varied snow samples from East Antarctica. First, we look at the relationship between isotopes and temperature from a geographical point of view, using results from three traverses across Antarctica, to see how the relationship is built up through the distillation process. We also take advantage of these measures to see how second-order parameters (d-excess and 17O-excess) are related to δ18O and how they are controlled. d-excess increases in the interior of the continent (i.e., when δ18O decreases), due to the distillation process, whereas 17O-excess decreases in remote areas, due to kinetic fractionation at low temperature. In both cases, these changes are associated with the loss of original information regarding the source. Then, we look at the same relationships in precipitation samples collected over 1 year at Dome C and Vostok, as well as in surface snow at Dome C. We note that the slope of the δ18O vs. temperature (T) relationship decreases in these samples compared to those from the traverses, and thus caution is advocated when using spatial slopes for past climate reconstruction. The second-order parameters behave in the same way in the precipitation as in the surface snow from traverses, indicating that similar processes are active and that their interpretation in terms of source climatic parameters is strongly complicated by local temperature effects in East Antarctica. Finally we check if the same relationships between δ18O and second-order parameters are also found in the snow from four snow pits. While the d-excess remains opposed to δ18O in most snow pits, the 17O-excess is no longer positively correlated to δ18O and even shows anti-correlation to δ18O at Vostok. This may be due to a stratospheric influence at this site and/or to post-deposition processes. © Author(s) 2016.
学科领域	climate signal; hydrogen isotope; ice core; isotopic composition; last glaciation; oxygen isotope; paleoclimate; paleotemperature; precipitation (climatology); reconstruction; signal-to-noise ratio; snow; temperature effect; Antarctica; Dome Concordia; East Antarctica
语种	英语
scopus关键词	climate signal; hydrogen isotope; ice core; isotopic composition; last glaciation; oxygen isotope; paleoclimate; paleotemperature; precipitation (climatology); reconstruction; signal-to-noise ratio; snow; temperature effect; Antarctica; Dome Concordia; East Antarctica
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/119661
作者单位	LSCE - UMR CEA-CNRS-UVSQ, Université Paris Saclay, 8212-IPSL, Gif-sur-Yvette, France; DAIS, Ca'Foscari University of Venice, Venice, Italy; Faculty of Science, University of the Ryukyus, Okinawa, Japan; Tateyama Caldera Sabo Museum, Toyama, Japan; National Institute of Polar Research, Research Organization of Information and Systems, Tokyo, Japan; Department of Polar Science, Graduate University for Advanced Studies (SOKENDAI), Tokyo, Japan; LPCA, Université du Littoral Côte d'Opale, Dunkirk, France; Arctic and Antarctic Research Institute, St. Petersburg, Russian Federation; Saint Petersburg State University, St. Petersburg, Russian Federation; Institute of Earth Sciences, Hebrew University of Jerusalem, Jerusalem, Israel; Univ. Grenoble Alpes/CNRS, Laboratoire de Glaciologie et Géophysique de l'Environnement (LGGE), Grenoble, 38041, France; LECA, UMR5553 - CNRS-UJF, Université Joseph Fourier, Grenoble, France; Aix-Marseille Université, CNRS, CEREGE - UM34, Aix-en-Provence, 13545, France; Laboratoire de ...
推荐引用方式 GB/T 7714	Touzeau A.,Landais A.,Stenni B.,et al. Acquisition of isotopic composition for surface snow in East Antarctica and the links to climatic parameters[J],2016,10(2).
APA	Touzeau A..,Landais A..,Stenni B..,Uemura R..,Fukui K..,...&Risi C..(2016).Acquisition of isotopic composition for surface snow in East Antarctica and the links to climatic parameters.Cryosphere,10(2).
MLA	Touzeau A.,et al."Acquisition of isotopic composition for surface snow in East Antarctica and the links to climatic parameters".Cryosphere 10.2(2016).