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

doi:https://doi.org/10.5194/cp-14-653-2018

Articles | Volume 14, issue 5

https://doi.org/10.5194/cp-14-653-2018

© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue:

Climate of the past 2000 years: regional and trans-regional...

https://doi.org/10.5194/cp-14-653-2018

© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 14, issue 5

Research article

|

24 May 2018

Research article |

| 24 May 2018

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, and Zhengtang Guo

Data sets

Tree-ring oxygen isotope chronology in western Nepal M. Sano, R. Ramesh, M. Sheshshayee, and R. Sukumar https://www.ncdc.noaa.gov/paleo/study/22547

Tree-ring oxygen isotope chronology in Bhutan M. Sano, P. Tshering, J. Komori, K. Fujita, C. Xu, and T. Nakatsuka https://www.ncdc.noaa.gov/paleo/study/22548

Tree-ring oxygen isotope chronology in Northwest India M. Sano, A. Dimri, R., Ramesh, C. Xu, Z. Li, and T. Nakatsuka https://www.ncdc.noaa.gov/paleo/study/22549

Tree-ring oxygen isotope chronology in northern India C. Xu, M. Sano, A. P. Dimri, R. Ramesh, T. Nakatsuka, F. Shi, and Z. Guo https://www.ncdc.noaa.gov/paleo/study/22550

Tree-ring oxygen isotope chronology in central Nepal C. Xu, M. Sano, A. P. Dimri, R. Ramesh, T. Nakatsuka, F. Shi, and Z. Guo https://www.ncdc.noaa.gov/paleo/study/22551

Regional tree-ring oxygen isotope chronology from the Himalaya C. Xu, M. Sano, A. P. Dimri, R. Ramesh, T. Nakatsuka, F. Shi, and Z. Guo https://www.ncdc.noaa.gov/paleo/study/23830

Short summary

We have constructed a regional tree ring cellulose oxygen isotope record using a total of five chronologies obtained from the Himalaya. Centennial changes in the regional tree ring record indicate a trend of weakened Indian summer monsoon (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.