气候变化领域集成服务门户(CCPortal): A 2700-year annual timescale and accumulation history for an ice core from Roosevelt Island; West Antarctica

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DOI	10.5194/cp-15-751-2019
	A 2700-year annual timescale and accumulation history for an ice core from Roosevelt Island; West Antarctica
	Winstrup M.; Vallelonga P.; Kjær H.A.; Fudge T.J.; Lee J.E.; Riis M.H.; Edwards R.; Bertler N.A.N.; Blunier T.; Brook E.J.; Buizert C.; Ciobanu G.; Conway H.; Dahl-Jensen D.; Ellis A.; Emanuelsson B.D.; Hindmarsh R.C.A.; Keller E.D.; Kurbatov A.V.; Mayewski P.A.; Neff P.D.; Pyne R.L.; Simonsen M.F.; Svensson A.; Tuohy A.; Waddington E.D.; Wheatley S.
发表日期	2019
ISSN	18149324
起始页码	751
结束页码	779
卷号	15 期号:2
英文摘要	We present a 2700-year annually resolved chronology and snow accumulation history for the Roosevelt Island Climate Evolution (RICE) ice core, Ross Ice Shelf, West Antarctica. The core adds information on past accumulation changes in an otherwise poorly constrained sector of Antarctica. The timescale was constructed by identifying annual cycles in high-resolution impurity records, and it constitutes the top part of the Roosevelt Island Ice Core Chronology 2017 (RICE17). Validation by volcanic and methane matching to the WD2014 chronology from the WAIS Divide ice core shows that the two timescales are in excellent agreement. In a companion paper, gas matching to WAIS Divide is used to extend the timescale for the deeper part of the core in which annual layers cannot be identified. Based on the annually resolved timescale, we produced a record of past snow accumulation at Roosevelt Island. The accumulation history shows that Roosevelt Island experienced slightly increasing accumulation rates between 700 BCE and 1300 CE, with an average accumulation of 0:250:02m water equivalent (w.e.) per year. Since 1300 CE, trends in the accumulation rate have been consistently negative, with an acceleration in the rate of decline after the mid-17th century. The current accumulation rate at Roosevelt Island is 0:2100:002m w.e. yr1 (average since 1965 CE), and it is rapidly declining with a trend corresponding to 0.8mmyr2. The decline observed since the mid-1960s is 8 times faster than the long-term decreasing trend taking place over the previous centuries, with decadal mean accumulation rates consistently being below average. Previous research has shown a strong link between Roosevelt Island accumulation rates and the location and intensity of the Amundsen Sea Low, which has a significant impact on regional sea-ice extent. The decrease in accumulation rates at Roosevelt Island may therefore be explained in terms of a recent strengthening of the ASL and the expansion of sea ice in the eastern Ross Sea. The start of the rapid decrease in RICE accumulation rates observed in 1965 CE may thus mark the onset of significant increases in regional seaice extent. © Author(s) 2019.
语种	英语
scopus关键词	accumulation rate; annual cycle; chronology; environmental history; historical record; ice core; model validation; sea ice; snow accumulation; temporal variation; timescale; Amundsen Sea; Antarctica; Roosevelt Island [West Antarctica]; Ross Ice Shelf; Southern Ocean; West Antarctica
来源期刊	Climate of the Past
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/146826
作者单位	Centre for Ice and Climate, Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark; Earth and Space Sciences, University of Washington, Seattle, WA, United States; College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR, United States; Physics and Astronomy, Curtin University, Perth, WA, Australia; Department of Civil and Environmental Engineering, University of Wisconsin-Madison, Madison, WI, United States; Antarctic Research Centre, Victoria University of Wellington, Wellington, New Zealand; GNS Science, Lower Hutt, New Zealand; British Antarctic Survey, Cambridge, United Kingdom; Climate Change Institute, University of Maine, Orono, ME, United States; Earth and Environmental Sciences, University of Rochester, Rochester, NY, United States; Danish Meteorological Institute, Copenhagen, Denmark
推荐引用方式 GB/T 7714	Winstrup M.,Vallelonga P.,Kjær H.A.,et al. A 2700-year annual timescale and accumulation history for an ice core from Roosevelt Island; West Antarctica[J],2019,15(2).
APA	Winstrup M..,Vallelonga P..,Kjær H.A..,Fudge T.J..,Lee J.E..,...&Wheatley S..(2019).A 2700-year annual timescale and accumulation history for an ice core from Roosevelt Island; West Antarctica.Climate of the Past,15(2).
MLA	Winstrup M.,et al."A 2700-year annual timescale and accumulation history for an ice core from Roosevelt Island; West Antarctica".Climate of the Past 15.2(2019).