气候变化领域集成服务门户(CCPortal): Stable water isotopes and accumulation rates in the Union Glacier region, Ellsworth Mountains, West Antarctica, over the last 35 years

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DOI	10.5194/tc-14-881-2020
	Stable water isotopes and accumulation rates in the Union Glacier region, Ellsworth Mountains, West Antarctica, over the last 35 years
	Hoffmann K.; Fernandoy F.; Meyer H.; Thomas E.R.; Aliaga M.; Tetzner D.; Freitag J.; Opel T.; Arigony-Neto J.; Florian Göbel C.; Jaña R.; Rodríguez Oroz D.; Tuckwell R.; Ludlow E.; Mcconnell J.R.; Schneider C.
发表日期	2020
ISSN	19940416
起始页码	881
结束页码	904
卷号	14 期号:3
英文摘要	Antarctica is well known to be highly susceptible to atmospheric and oceanic warming. However, due to the lack of long-term and in situ meteorological observations, little is known about the magnitude of the warming and the meteorological conditions in the intersection region between the Antarctic Peninsula (AP), the West Antarctic Ice Sheet (WAIS) and the East Antarctic Ice Sheet (EAIS). Here we present new stable water isotope data (δ18O, δD, d) and accumulation rates from firn cores in the Union Glacier (UG) region, located in the Ellsworth Mountains at the northern edge of the WAIS. The firn core stable oxygen isotopes and the d excess exhibit no statistically significant trend for the period 1980-2014, suggesting that regional changes in near-surface air temperature and moisture source variability have been small during the last 35 years. Backward trajectory modelling revealed the Weddell Sea sector, Coats Land and Dronning Maud Land (DML) to be the main moisture source regions for the study site throughout the year. We found that mean annual δ18O (δD) values in the UG region are negatively correlated with sea ice concentrations (SICs) in the northern Weddell Sea but not influenced by large-scale modes of climate variability such as the Southern Annular Mode (SAM) and the El Niño-Southern Oscillation (ENSO). Only mean annual d-excess values show a weak positive correlation with the SAM. On average annual snow accumulation in the UG region amounts to 0.245 m w.e. a-1 in 1980-2014 and has slightly decreased during this period. It is only weakly related to sea ice conditions in the Weddell Sea sector and not correlated with SAM and ENSO. We conclude that neither the rapid warming nor the large increases in snow accumulation observed on the AP and in West Antarctica during the last decades have extended inland to the Ellsworth Mountains. Hence, the UG region, although located at the northern edge of the WAIS and relatively close to the AP, exhibits rather stable climate characteristics similar to those observed in East Antarctica. © Author(s) 2020.
英文关键词	air temperature; hydrogen isotope; meteorology; sea ice; snow accumulation; snow cover; stable isotope; Antarctic Ice Sheet; Antarctic Peninsula; Antarctica; Antarctica; East Antarctic Ice Sheet; East Antarctica; Ellsworth Mountains; Queen Maud Land; Southern Ocean; Union Glacier; Weddell Sea; West Antarctic Ice Sheet; West Antarctica
语种	英语
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/202102
作者单位	Geographisches Institut, Humboldt-Universität zu Berlin, Unter den Linden 6, Berlin, 10099, Germany; Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Research Unit Potsdam, Telegrafenberg A45, Potsdam, 14473, Germany; Facultad de Ingeniería, Universidad Nacional Andrés Bello, Quillota 980, Viña del Mar, 2531015, Chile; Ice Dynamics and Paleoclimate, British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, United Kingdom; Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge, CB2 3EQ, United Kingdom; Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Am Alten Hafen 26, Bremerhaven, 27568, Germany; Department of Geography, Permafrost Laboratory, University of Sussex, Falmer, Brighton, BN1 9QJ, United Kingdom; Instituto de Oceanografia, Laboratório de Monitoramento da Criosfera, Universidade Federal do Rio Grande, Avenida Itália, km 8, Rio Grande, RS, CEP 96203-900, Brazil; Departamento Científico, Instituto Antártico...
推荐引用方式 GB/T 7714	Hoffmann K.,Fernandoy F.,Meyer H.,et al. Stable water isotopes and accumulation rates in the Union Glacier region, Ellsworth Mountains, West Antarctica, over the last 35 years[J],2020,14(3).
APA	Hoffmann K..,Fernandoy F..,Meyer H..,Thomas E.R..,Aliaga M..,...&Schneider C..(2020).Stable water isotopes and accumulation rates in the Union Glacier region, Ellsworth Mountains, West Antarctica, over the last 35 years.Cryosphere,14(3).
MLA	Hoffmann K.,et al."Stable water isotopes and accumulation rates in the Union Glacier region, Ellsworth Mountains, West Antarctica, over the last 35 years".Cryosphere 14.3(2020).