Decreasing Indian summer monsoon on the northern Indian sub-continent during the last 180 years

Evidence from five tree-ring cellulose oxygen isotope chronologies

Chenxi Xu, Masaki Sano, Ashok Priyadarshan DImri, Rengaswamy Ramesh, Takeshi Nakatsuka, Feng Shi, Zhengtang Guo

    Research output: Contribution to journalArticle

    8 Citations (Scopus)

    Abstract

    We have constructed a regional tree-ring cellulose oxygen isotope (δ18O) record for the northern Indian sub-continent based on two new records from northern India and central Nepal and three published records from northwestern India, western Nepal and Bhutan. The record spans the common interval from 1743 to 2008 CE. Correlation analysis reveals that the record is significantly and negatively correlated with the three regional climatic indices: all India rainfall (AIR; r = -0.5, p < 0.001, n = 138), Indian monsoon index (IMI; r = -0.45, p < 0.001, n = 51) and the intensity of monsoonal circulation (r = -0.42, p < 0.001, n = 51). The close relationship between tree-ring cellulose δ18O and the Indian summer monsoon (ISM) can be explained by oxygen isotope fractionation mechanisms. Our results indicate that the regional tree-ring cellulose δ18O record is suitable for reconstructing high-resolution changes in the ISM. The record exhibits significant interannual and long-term variations. Interannual changes are closely related to the El Niño-Southern Oscillation (ENSO), which indicates that the ISM was affected by ENSO in the past. However, the ISM-ENSO relationship was not consistent over time, and it may be partly modulated by Indian Ocean sea surface temperature (SST). Long-term changes in the regional tree-ring δ18O record indicate a possible trend of weakened ISM intensity since 1820. Decreasing ISM activity is also observed in various high-resolution ISM records from southwest China and Southeast Asia, and may be the result of reduced land-ocean thermal contrasts since 1820 CE.

    Original languageEnglish
    Pages (from-to)653-664
    Number of pages12
    JournalClimate of the Past
    Volume14
    Issue number5
    DOIs
    Publication statusPublished - 2018 May 24

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    tree ring
    oxygen isotope
    chronology
    cellulose
    monsoon
    summer
    Southern Oscillation
    continent
    long-term change
    new record
    sea surface
    sea surface temperature
    fractionation
    rainfall
    ocean

    ASJC Scopus subject areas

    • Global and Planetary Change
    • Stratigraphy
    • Palaeontology

    Cite this

    Decreasing Indian summer monsoon on the northern Indian sub-continent during the last 180 years : Evidence from five tree-ring cellulose oxygen isotope chronologies. / Xu, Chenxi; Sano, Masaki; DImri, Ashok Priyadarshan; Ramesh, Rengaswamy; Nakatsuka, Takeshi; Shi, Feng; Guo, Zhengtang.

    In: Climate of the Past, Vol. 14, No. 5, 24.05.2018, p. 653-664.

    Research output: Contribution to journalArticle

    Xu, Chenxi ; Sano, Masaki ; DImri, Ashok Priyadarshan ; Ramesh, Rengaswamy ; Nakatsuka, Takeshi ; Shi, Feng ; Guo, Zhengtang. / Decreasing Indian summer monsoon on the northern Indian sub-continent during the last 180 years : Evidence from five tree-ring cellulose oxygen isotope chronologies. In: Climate of the Past. 2018 ; Vol. 14, No. 5. pp. 653-664.
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    AU - Sano, Masaki

    AU - DImri, Ashok Priyadarshan

    AU - Ramesh, Rengaswamy

    AU - Nakatsuka, Takeshi

    AU - Shi, Feng

    AU - Guo, Zhengtang

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    AB - We have constructed a regional tree-ring cellulose oxygen isotope (δ18O) record for the northern Indian sub-continent based on two new records from northern India and central Nepal and three published records from northwestern India, western Nepal and Bhutan. The record spans the common interval from 1743 to 2008 CE. Correlation analysis reveals that the record is significantly and negatively correlated with the three regional climatic indices: all India rainfall (AIR; r = -0.5, p < 0.001, n = 138), Indian monsoon index (IMI; r = -0.45, p < 0.001, n = 51) and the intensity of monsoonal circulation (r = -0.42, p < 0.001, n = 51). The close relationship between tree-ring cellulose δ18O and the Indian summer monsoon (ISM) can be explained by oxygen isotope fractionation mechanisms. Our results indicate that the regional tree-ring cellulose δ18O record is suitable for reconstructing high-resolution changes in the ISM. The record exhibits significant interannual and long-term variations. Interannual changes are closely related to the El Niño-Southern Oscillation (ENSO), which indicates that the ISM was affected by ENSO in the past. However, the ISM-ENSO relationship was not consistent over time, and it may be partly modulated by Indian Ocean sea surface temperature (SST). Long-term changes in the regional tree-ring δ18O record indicate a possible trend of weakened ISM intensity since 1820. Decreasing ISM activity is also observed in various high-resolution ISM records from southwest China and Southeast Asia, and may be the result of reduced land-ocean thermal contrasts since 1820 CE.

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