气候变化领域集成服务门户(CCPortal): Statistical extraction of volcanic sulphate from nonpolar ice cores

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DOI	10.1029/2011JD016592
	Statistical extraction of volcanic sulphate from nonpolar ice cores
	Moore, J. C.; Beaudon, E.; Kang, Shichang; Divine, D.; Isaksson, E.; Pohjola, V. A.; van de Wal, R. S. W.
发表日期	2012
ISSN	2169-897X
EISSN	2169-8996
卷号	117
英文摘要	Ice cores from outside the Greenland and Antarctic ice sheets are difficult to date because of seasonal melting and multiple sources (terrestrial, marine, biogenic and anthropogenic) of sulfates deposited onto the ice. Here we present a method of volcanic sulfate extraction that relies on fitting sulfate profiles to other ion species measured along the cores in moving windows in log space. We verify the method with a well dated section of the Belukha ice core from central Eurasia. There are excellent matches to volcanoes in the preindustrial, and clear extraction of volcanic peaks in the post-1940 period when a simple method based on calcium as a proxy for terrestrial sulfate fails due to anthropogenic sulfate deposition. We then attempt to use the same statistical scheme to locate volcanic sulfate horizons within three ice cores from Svalbard and a core from Mount Everest. Volcanic sulfate is < 5% of the sulfate budget in every core, and differences in eruption signals extracted reflect the large differences in environment between western, northern and central regions of Svalbard. The Lomonosovfonna and Vestfonna cores span about the last 1000 years, with good extraction of volcanic signals, while Holtedahlfonna which extends to about AD1700 appears to lack a clear record. The Mount Everest core allows clean volcanic signal extraction and the core extends back to about AD700, slightly older than a previous flow model has suggested. The method may thus be used to extract historical volcanic records from a more diverse geographical range than hitherto.
学科领域	Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Meteorology & Atmospheric Sciences
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/111656
作者单位	Beijing Normal Univ, Coll Global Change & Earth Syst Sci, Beijing 100875, Peoples R China
推荐引用方式 GB/T 7714	Moore, J. C.,Beaudon, E.,Kang, Shichang,et al. Statistical extraction of volcanic sulphate from nonpolar ice cores[J]. 中国科学院西北生态环境资源研究院,2012,117.
APA	Moore, J. C..,Beaudon, E..,Kang, Shichang.,Divine, D..,Isaksson, E..,...&van de Wal, R. S. W..(2012).Statistical extraction of volcanic sulphate from nonpolar ice cores.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,117.
MLA	Moore, J. C.,et al."Statistical extraction of volcanic sulphate from nonpolar ice cores".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 117(2012).