气候变化领域集成服务门户(CCPortal): Snowfall and Water Stable Isotope Variability in East Antarctica Controlled by Warm Synoptic Events

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DOI	10.1029/2020JD032863
	Snowfall and Water Stable Isotope Variability in East Antarctica Controlled by Warm Synoptic Events
	Servettaz A.P.M.; Orsi A.J.; Curran M.A.J.; Moy A.D.; Landais A.; Agosta C.; Winton V.H.L.; Touzeau A.; McConnell J.R.; Werner M.; Baroni M.
发表日期	2020
ISSN	2169897X
卷号	125 期号:17
英文摘要	Understanding climate proxy records that preserve physical characteristics of past climate is a prerequisite to reconstruct long-term climatic conditions. Water stable isotope ratios (δ18O) constitute a widely used proxy in ice cores to reconstruct temperature and climate. However, the original climate signal is altered between the formation of precipitation and the ice, especially in low-accumulation areas such as the East Antarctic Plateau. Atmospheric conditions under which the isotopic signal is acquired at Aurora Basin North (ABN), East Antarctica, are characterized with the regional atmospheric model Modèle Atmosphérique Régional (MAR). The model shows that 50% of the snow is accumulated in less than 24 days year−1. Snowfall occurs throughout the year and intensifies during winter, with 64% of total accumulation between April and September, leading to a cold bias of −0.86°C in temperatures above inversion compared to the annual mean of −29.7°C. Large snowfall events are associated with high-pressure systems forcing warm oceanic air masses toward the Antarctic interior, which causes a warm bias of +2.83°C. The temperature-δ18O relationship, assessed with the global atmospheric model ECHAM5-wiso, is primarily constrained by the winter variability, but the observed slope is valid year-round. Three snow δ18O records covering 2004–2014 indicate that the anomalies recorded in the ice core are attributable to the occurrence of warm winter storms bringing precipitation to ABN and support the interpretation of δ18O in this region as a marker of temperature changes related to large-scale atmospheric conditions, particularly blocking events and variations in the Southern Annular Mode. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Antarctica; climate; precipitation; water stable isotopes
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185787
作者单位	Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, Gif-sur-Yvette, France; Australian Antarctic Division, Kingston, TAS, Australia; Antarctic Climate and Ecosystems Cooperative Research Centre, University of Tasmania, Hobart, TAS, Australia; Physics and Astronomy, Curtin University, Perth, WA, Australia; Antarctic Research Centre, Victoria University of Wellington, Wellington, New Zealand; Geophysical Institute and Bjerknes Centre for Climate Research, University of Bergen, Bergen, Norway; Division of Hydrologic Sciences, Desert Research Institute, Reno, NV, United States; Helmholtz Centre for Polar and Marine Research, Alfred Wegener Institute, Bremerhaven, Germany; Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement, Université Aix-Marseille, Aix-en-Provence, France
推荐引用方式 GB/T 7714	Servettaz A.P.M.,Orsi A.J.,Curran M.A.J.,et al. Snowfall and Water Stable Isotope Variability in East Antarctica Controlled by Warm Synoptic Events[J],2020,125(17).
APA	Servettaz A.P.M..,Orsi A.J..,Curran M.A.J..,Moy A.D..,Landais A..,...&Baroni M..(2020).Snowfall and Water Stable Isotope Variability in East Antarctica Controlled by Warm Synoptic Events.Journal of Geophysical Research: Atmospheres,125(17).
MLA	Servettaz A.P.M.,et al."Snowfall and Water Stable Isotope Variability in East Antarctica Controlled by Warm Synoptic Events".Journal of Geophysical Research: Atmospheres 125.17(2020).