DOI: 10.1002/jgrd.50664
论文题名: May-September precipitation in the Bhutan Himalaya since 1743 as reconstructed from tree ring cellulose δ18O
作者: Sano M. ; Tshering P. ; Komori J. ; Fujita K. ; Xu C. ; Nakatsuka T.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 15 起始页码: 8399
结束页码: 8410
语种: 英语
英文关键词: Bhutan
; ENSO
; Isotope dendroclimatology
; Larch
; Monsoon
Scopus关键词: Atmospheric pressure
; Atmospheric thermodynamics
; Climatology
; Forestry
; Isotopes
; Production platforms
; Trees (mathematics)
; Bhutan
; Dendroclimatology
; ENSO
; Larch
; Monsoon
; Data reduction
; cellulose
; coniferous tree
; dendroclimatology
; El Nino-Southern Oscillation
; monsoon
; oxygen isotope
; Pacific Decadal Oscillation
; precipitation (climatology)
; reconstruction
; sea surface temperature
; tree ring
; twentieth century
; Bhutan
; China
; Himalayas
; Qinghai-Xizang Plateau
; Juniperus indica
; Larix
; Larix griffithiana
; Picea spinulosa
英文摘要: We developed a 50-year tree ring δ18O chronology for each of three tree species (Juniperus indica, Larix griffithii, and Picea spinulosa) using a total of 12 trees (four trees per species) from the Bhutan Himalaya. Despite originating from different species sampled at two different altitudes, the δ18O chronologies are highly correlated with one another (r = 0.76-0.89). Response analyses reveal that tree ring δ18O values are controlled mainly by summer precipitation, irrespective of species. Based on these results, a robust 269-year δ18O chronology was established to reconstruct the amount of May-September precipitation based on data from four larch trees. Our tree ring δ18O data show significant correlations with those from other regions of the Himalaya and the Tibetan Plateau, indicating that common signals related to monsoon activity are recorded in the data. However, at centennial timescales, our data from Bhutan show normal conditions during the 20th century, whereas records from sites in western Nepal and the southern/eastern Tibetan Plateau show weakening trends in monsoon intensity during the last 100-200 years; the weakening trends may be the result of a reduction in the meridional sea surface temperature gradient in the Indian Ocean during this time. At continental scales, the tree ring records show that areas more from ocean basins are particularly sensitive to reduced monsoon circulation. Correlation analyses suggest that the El Niño-Southern Oscillation (ENSO) plays an important role in modulating summer precipitation. However, the teleconnected relationship disappears during the period 1951-1970, coinciding with a negative phase of the Pacific Decadal Oscillation (PDO), implying interdecadal modulation of the PDO on the influence of the ENSO on precipitation in Bhutan. Key Points Tree ring delta-18O data are strongly correlated among different species No delta-18O trends in Bhutan since 1900 but inland data show reduced rainfall Link between delta-18O data and ENSO disappears when PDO is in negative phase ©2013. American Geophysical Union. All Rights Reserved. 资助项目: 19253001
; 2310262
; 23242047
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63495
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Graduate School of Environmental Studies, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan; Department of Geology, Mines Royal Government of Bhutan, Thimphu, Bhutan
Recommended Citation:
Sano M.,Tshering P.,Komori J.,et al. May-September precipitation in the Bhutan Himalaya since 1743 as reconstructed from tree ring cellulose δ18O[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(15)