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Moisture source signals preserved in a 242-year tree-ring delta O-18 chronology in the western Himalaya

文献类型：期刊论文

作者Sano, Masaki1,2; Dimri, A. P.3; Ramesh, R.4,5; Xu, Chenxi1,6; Li, Zhen1; Nakatsuka, Takeshi1
刊名GLOBAL AND PLANETARY CHANGE
出版日期2017-10-01
卷号157页码:73-82
关键词Isotope dendroclimatology Indian summer monsoon Moisture source Arabian Sea ENSO
ISSN号0921-8181
DOI10.1016/j.gloplacha.2017.08.009
文献子类Article
英文摘要The oxygen isotope ratio (delta O-18) of tree-ring cellulose is known to be a reliable proxy for hydroclimate in monsoon Asia. However, tree-ring delta O-18 data are still spatially and temporally limited, so a denser tree-ring network in Asia is required to better understand the dynamics of the monsoon circulation and its past variability. Here, we present a 242-year delta O-18 chronology calculated from five silver fir trees collected in the western (Indian) Himalaya, a region located on the northwestern periphery of the summer monsoon incursions. Response analyses using regionalized climatic data revealed that tree-ring delta O-18 is controlled by hydroclimatic variables, including precipitation, relative humidity, and the drought index, during the summer monsoon season. In addition, spatial correlation analyses with gridded climatic parameters showed that the strongest correlations of tree-ring delta O-18 are not observed with the climatic parameters at the sampling site, but with those in a region several hundred kilometers to the southwest, indicating that water vapor originating in the Arabian Sea is transported to the study site. Based on these results, we reconstructed the self-calibrating Palmer Drought Severity Index (scPDSI) for the summer monsoon season (June-September) over the past 242 years (1767-2008 CE), using a linear regression model that accounts for 45.0% of the actual scPDSI variance. Our chronology showed significant correlations with other tree-ring delta O-18 data from Nepal and Bhutan, indicating that common signals related to the moisture supply from the Bay of Bengal are also recorded in the present reconstruction. However, the tree-ring record from India often showed weak correlations with that from Bhutan, especially when the summer monsoon was relatively weak. This result, together with the fact that the water vapor at the tree site was also derived from the Arabian Sea, implies that a weaker monsoon circulation enhances the flux of Arabian Sea moisture and reduces the flux of Bay of Bengal moisture to the study region.
WOS关键词SOUTHEASTERN TIBETAN PLATEAU ; ASIAN SUMMER MONSOON ; SOUTHERN-OSCILLATION ; STABLE-ISOTOPES ; TIME-SERIES ; CLOUD COVER ; PRECIPITATION ; INDIA ; VARIABILITY ; CELLULOSE
WOS研究方向Physical Geography ; Geology
语种英语
WOS记录号WOS:000413612100007
出版者ELSEVIER SCIENCE BV
资助机构Indian Space Research Organization-Geosphere Biosphere Programme, Government of India(ISRO-GBP-PRL:CCD881) ; Japan Society for the Promotion of Science, Japan(2310262 ; Chinese Academy of Sciences (CAS) ; 23242047 ; 26244049) ; Indian Space Research Organization-Geosphere Biosphere Programme, Government of India(ISRO-GBP-PRL:CCD881) ; Japan Society for the Promotion of Science, Japan(2310262 ; Chinese Academy of Sciences (CAS) ; 23242047 ; 26244049) ; Indian Space Research Organization-Geosphere Biosphere Programme, Government of India(ISRO-GBP-PRL:CCD881) ; Japan Society for the Promotion of Science, Japan(2310262 ; Chinese Academy of Sciences (CAS) ; 23242047 ; 26244049) ; Indian Space Research Organization-Geosphere Biosphere Programme, Government of India(ISRO-GBP-PRL:CCD881) ; Japan Society for the Promotion of Science, Japan(2310262 ; Chinese Academy of Sciences (CAS) ; 23242047 ; 26244049)
源URL[http://ir.iggcas.ac.cn/handle/132A11/61999]  
专题地质与地球物理研究所_中国科学院新生代地质与环境重点实验室
通讯作者Sano, Masaki
作者单位1.Res Inst Humanity & Nat, Kyoto, Japan
2.Waseda Univ, Fac Human Sci, 2-579-15 Mikajima, Tokorozawa, Saitama 3591192, Japan
3.Jawaharlal Nehru Univ, Sch Environm Sci, New Delhi, India
4.Phys Res Lab, Geosci Div, Ahmadabad, Gujarat, India
5.Natl Inst Sci Educ & Res, Sch Earth & Planetary Sci, Odisha, India
6.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Sano, Masaki,Dimri, A. P.,Ramesh, R.,et al. Moisture source signals preserved in a 242-year tree-ring delta O-18 chronology in the western Himalaya[J]. GLOBAL AND PLANETARY CHANGE,2017,157:73-82.
APA Sano, Masaki,Dimri, A. P.,Ramesh, R.,Xu, Chenxi,Li, Zhen,&Nakatsuka, Takeshi.(2017).Moisture source signals preserved in a 242-year tree-ring delta O-18 chronology in the western Himalaya.GLOBAL AND PLANETARY CHANGE,157,73-82.
MLA Sano, Masaki,et al."Moisture source signals preserved in a 242-year tree-ring delta O-18 chronology in the western Himalaya".GLOBAL AND PLANETARY CHANGE 157(2017):73-82.

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来源：地质与地球物理研究所

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