decreasing indian summer monsoon on the northern indian sub-continent during the last 180 years: evidence from five tree-ring cellulose oxygen isotope chronologies
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2018
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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.
| Reference Key |
xu2018climatedecreasing
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| Authors | ;C. Xu;C. Xu;M. Sano;M. Sano;A. P. Dimri;R. Ramesh;R. Ramesh;R. Ramesh;T. Nakatsuka;F. Shi;F. Shi;Z. Guo;Z. Guo;Z. Guo |
| Journal | proceedings - 16th ieee/acis international conference on computer and information science, icis 2017 |
| Year | 2018 |
| DOI |
10.5194/cp-14-653-2018
|
| URL | |
| Keywords |
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