气候变化领域集成服务门户(CCPortal): Late-Holocene Indian summer monsoon variability revealed from a 3300-year-long lake sediment record from Nir'pa Co, southeastern Tibet

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DOI	10.1177/0959683616670220
	Late-Holocene Indian summer monsoon variability revealed from a 3300-year-long lake sediment record from Nir'pa Co, southeastern Tibet
	Bird, Broxton W.; Lei, Yanbin; Perello, Melanie; Polissar, Pratigya J.; Yao, Tandong; Finney, Bruce; Bain, Daniel; Pompeani, David; Thompson, Lonnie G.
发表日期	2017
ISSN	0959-6836
EISSN	1477-0911
卷号	27 期号:4
英文摘要	Sedimentological and geochemical results from Nir'pa Co, an alpine lake on the southeastern Tibetan Plateau, detail late-Holocene Indian summer monsoon (ISM) hydroclimate during the last 3300 years. Constrained by modern calibration, elevated silt and lithics and low sand and clay between 3.3 and 2.4 ka and 1.3 ka and the present indicate two pluvial phases with lake levels near their current overflow elevation. Between 2.4 and 1.3 ka, a sharp increase in sand and corresponding decrease in lithics and silt suggest drier conditions and lower lake levels at Nir'pa Co. Hydroclimate expressions in the sedimentological proxies during the Medieval Climate Anomaly (MCA) and Little Ice Age' (LIA) are not statistically significant, suggesting that these events were minor compared to the millennial scale variability on which they were superimposed. However, decreasing sand and increasing lithics and silt during the MCA between 950 and 800 cal. yr BP may suggest briefly wetter conditions, while increasing sand and reduced lithics and silt from 500 to 200 cal. yr BP suggest potentially drier conditions during the LIA. Similarities with regional records from lake sediment and ice cores and speleothem records from the central and eastern Tibetan Plateau, India, and the Arabian Sea, suggest generally coherent late-Holocene ISM variability in these regions. Increased late-Holocene ISM intensity occurred during times when Tibetan Plateau surface air temperatures were warmer, Indo-Pacific sea surface temperatures were elevated, and the tropical Pacific was in a La Nina-like mean state. Conversely, aridity between 2.4 and 1.3 ka occurred in concert with cooling on the Tibetan Plateau and in the Indo-Pacific with more El Nino-like conditions in the tropical Pacific. Differences with western Tibetan records may reflect a weakened ISM and stronger westerlies in this region during the late-Holocene.
关键词	drought hydroclimate "Little Ice Age'Medieval Climate Anomaly paleoclimate pluvial sedimentology Third Pole Environment
学科领域	Physical Geography; Geology
语种	英语
WOS研究方向	Geography, Physical ; Geosciences, Multidisciplinary
来源期刊	HOLOCENE
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/111906
作者单位	Indiana Univ Purdue Univ, Dept Earth Sci, 723 W Michigan SL 118, Indianapolis, IN 46202 USA
推荐引用方式 GB/T 7714	Bird, Broxton W.,Lei, Yanbin,Perello, Melanie,et al. Late-Holocene Indian summer monsoon variability revealed from a 3300-year-long lake sediment record from Nir'pa Co, southeastern Tibet[J]. 中国科学院西北生态环境资源研究院,2017,27(4).
APA	Bird, Broxton W..,Lei, Yanbin.,Perello, Melanie.,Polissar, Pratigya J..,Yao, Tandong.,...&Thompson, Lonnie G..(2017).Late-Holocene Indian summer monsoon variability revealed from a 3300-year-long lake sediment record from Nir'pa Co, southeastern Tibet.HOLOCENE,27(4).
MLA	Bird, Broxton W.,et al."Late-Holocene Indian summer monsoon variability revealed from a 3300-year-long lake sediment record from Nir'pa Co, southeastern Tibet".HOLOCENE 27.4(2017).