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学科主题: 地理学::自然地理学
题名: Southern Tibetan Plateau ice core delta O-18 reflects abrupt shifts in atmospheric circulation in the late 1970s
作者: Gao, J (Gao, Jing)1, 2; Risi, C (Risi, Camille)3; Masson-Delmotte, V (Masson-Delmotte, Valerie)4; He, Y (He, You)1, 5; Xu, BQ (Xu, Baiqing)1, 2
通讯作者: Gao, J
刊名: CLIMATE DYNAMICS
发表日期: 2016
DOI: 10.1007/s00382-015-2584-3
卷: 46, 期:1-2, 页:291-302
收录类别: SCI
合作性质: 国际
文章类型: Article
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.
语种: 英语
WOS记录号: WOS:000370040100021
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.itpcas.ac.cn/handle/131C11/7876
Appears in Collections:图书馆_期刊论文

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作者单位: 1.Chinese Acad Sci, Key Lab Tibetan Environm Changes & Land Surface P, Inst Tibetan Plateau Res, Beijing, Peoples R China
2.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
3.UPMC, CNRS, LMD IPSL, Paris, France
4.UMR 8212 CEA CNRS UVSQ IPSL, LSCE, Gif Sur Yvette, France
5.Chinese Acad Sci, State Key Lab Cryospher Sci, Cold & Arid Reg Environm & Engn Res Inst, Beijing, Peoples R China

Recommended Citation:
Gao, J ,Risi, C ,Masson-Delmotte, V ,et al. Southern Tibetan Plateau ice core delta O-18 reflects abrupt shifts in atmospheric circulation in the late 1970s[J]. CLIMATE DYNAMICS,2016,46(1-2):291-302.
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文件名: V.46(1-2) 291-302 2016.pdf
格式: Adobe PDF
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