气候变化领域集成服务门户(CCPortal): Southern Tibetan Plateau ice core delta O-18 reflects abrupt shifts in atmospheric circulation in the late 1970s

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DOI	10.1007/s00382-015-2584-3
	Southern Tibetan Plateau ice core delta O-18 reflects abrupt shifts in atmospheric circulation in the late 1970s
	Gao, Jing; Risi, Camille; Masson-Delmotte, Valerie; He, You; Xu, Baiqing
通讯作者	Gao, J (通讯作者)
发表日期	2016
ISSN	0930-7575
EISSN	1432-0894
起始页码	291
结束页码	302
卷号	46 期号:1-2
英文摘要	Ice cores from the Tibetan Plateau provide high-resolution records of changes in the snow and ice isotopic composition. In the monsoon sector of southern Tibetan Plateau, their climatic interpretation has been controversial. Here, we present a new high-resolution delta O-18 record obtained from 2206 measurements performed at 2-3 cm depth resolution along a 55.1 m depth ice core retrieved from the Noijinkansang glacier (NK, 5950 m a.s.l.) that spans the period from 1864 to 2006 AD. The data are characterized by high delta O-18 values in the nineteenth century, 1910s and 1960s, followed by a drop in the late 1970s and a recent increasing trend. The comparison with regional meteorological data and with a simulation performed with the LMDZiso general circulation model leads to the attribution of the abrupt shift in the late 1970s predominantly to changes in regional atmospheric circulation, together with the impact of atmospheric temperature change. Correlation analyses suggest that the large-scale modes of variability (PDO and ENSO, i.e. Pacific Decadal Oscillation and El Nino-Southern Oscillation) play important roles in modulating NK delta O-18 changes. The NK delta O-18 minimum at the end of the 1970s coincides with a PDO phase shift, an inflexion point of the zonal index (representing the overall intensity of the surface westerly anomalies over middle latitudes) as well as ENSO, implying inter-decadal modulation of the influence of the PDO/ENSO on the Indian monsoon on southern TP precipitation delta O-18. While convective activity above North India controls the intra-seasonal variability of precipitation delta O-18 in southern TP, other processes associated with changes in large-scale atmospheric circulation act at the inter-annual scale.
关键词	HIGH-RESOLUTION RECORD NORTH PACIFIC CLIMATE VARIABILITY PRECIPITATION ACCUMULATION PALEOCLIMATE TEMPERATURES EVEREST TROPICS MONSOON
英文关键词	Ice core delta O-18; Large-scale atmospheric circulation; Isotopic general circulation model; Southern Tibetan Plateau
语种	英语
WOS研究方向	Meteorology & Atmospheric Sciences
WOS类目	Meteorology & Atmospheric Sciences
WOS记录号	WOS:000370040100021
来源期刊	CLIMATE DYNAMICS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258859
推荐引用方式 GB/T 7714	Gao, Jing,Risi, Camille,Masson-Delmotte, Valerie,et al. Southern Tibetan Plateau ice core delta O-18 reflects abrupt shifts in atmospheric circulation in the late 1970s[J]. 中国科学院青藏高原研究所,2016,46(1-2).
APA	Gao, Jing,Risi, Camille,Masson-Delmotte, Valerie,He, You,&Xu, Baiqing.(2016).Southern Tibetan Plateau ice core delta O-18 reflects abrupt shifts in atmospheric circulation in the late 1970s.CLIMATE DYNAMICS,46(1-2).
MLA	Gao, Jing,et al."Southern Tibetan Plateau ice core delta O-18 reflects abrupt shifts in atmospheric circulation in the late 1970s".CLIMATE DYNAMICS 46.1-2(2016).