气候变化领域集成服务门户(CCPortal): The influence of the synoptic regime on stable water isotopes in precipitation at Dome C, East Antarctica

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DOI	10.5194/tc-11-2345-2017
	The influence of the synoptic regime on stable water isotopes in precipitation at Dome C, East Antarctica
	Schlosser E.; Dittmann A.; Stenni B.; Powers J.G.; Manning K.W.; Valt M.; Cagnati A.; Grigioni P.; Scarchilli C.
发表日期	2017
ISSN	19940416
卷号	11 期号:5
英文摘要	The correct derivation of paleotemperatures from ice cores requires exact knowledge of all processes involved before and after the deposition of snow and the subsequent formation of ice. At the Antarctic deep ice core drilling site Dome C, a unique data set of daily precipitation amount, type, and stable water isotope ratios is available that enables us to study in detail atmospheric processes that influence the stable water isotope ratio of precipitation. Meteorological data from both automatic weather station and a mesoscale atmospheric model were used to investigate how different atmospheric flow patterns determine the precipitation parameters. A classification of synoptic situations that cause precipitation at Dome C was established and, together with back-Trajectory calculations, was utilized to estimate moisture source areas. With the resulting source area conditions (wind speed, sea surface temperature, and relative humidity) as input, the precipitation stable isotopic composition was modeled using the so-called Mixed Cloud Isotope Model (MCIM). The model generally underestimates the depletion of 18O in precipitation, which was not improved by using condensation temperature rather than inversion temperature. Contrary to the assumption widely used in ice core studies, a more northern moisture source does not necessarily mean stronger isotopic fractionation. This is due to the fact that snowfall events at Dome C are often associated with warm air advection due to amplification of planetary waves, which considerably increases the site temperature and thus reduces the temperature difference between source area and deposition site. In addition, no correlation was found between relative humidity at the moisture source and the deuterium excess in precipitation. The significant difference in the isotopic signal of hoarfrost and diamond dust was shown to disappear after removal of seasonality. This study confirms the results of an earlier study carried out at Dome Fuji with a shorter data set using the same methods.
学科领域	atmospheric modeling; climate modeling; data set; ice core; isotopic composition; precipitation (climatology); relative humidity; stable isotope; synoptic meteorology; weather station; Antarctica; Dome Concordia; Dome Fuji; East Antarctica
语种	英语
scopus关键词	atmospheric modeling; climate modeling; data set; ice core; isotopic composition; precipitation (climatology); relative humidity; stable isotope; synoptic meteorology; weather station; Antarctica; Dome Concordia; Dome Fuji; 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/119324
作者单位	Inst. of Atmospheric and Cryospheric Sciences, University of Innsbruck, Innsbruck, Austria; Austrian Polar Research Institute, Vienna, Austria; Department of Environmental Sciences, Informatics and Statistics, Ca 'Foscari University of Venice, Venice, Italy; National Center for Atmospheric Research, Boulder, CO, United States; Laboratoire des Sciences du Climate et de l'Environnement, Gif-sur-Yvette, France; ARPA Center of Avalanches, Arabba, Italy; Laboratory for Observations and Analyses of the Earth and Climate, ENEA, Rome, Italy
推荐引用方式 GB/T 7714	Schlosser E.,Dittmann A.,Stenni B.,et al. The influence of the synoptic regime on stable water isotopes in precipitation at Dome C, East Antarctica[J],2017,11(5).
APA	Schlosser E..,Dittmann A..,Stenni B..,Powers J.G..,Manning K.W..,...&Scarchilli C..(2017).The influence of the synoptic regime on stable water isotopes in precipitation at Dome C, East Antarctica.Cryosphere,11(5).
MLA	Schlosser E.,et al."The influence of the synoptic regime on stable water isotopes in precipitation at Dome C, East Antarctica".Cryosphere 11.5(2017).