TY - CHAP
T1 - Summer monsoon variability in the himalaya over recent centuries
AU - Sano, Masaki
AU - Xu, Chenxi
AU - Dimri, A. P.
AU - Ramesh, R.
N1 - Publisher Copyright:
© Springer Nature Switzerland AG 2020. All rights reserved.
PY - 2019/1/1
Y1 - 2019/1/1
N2 - Hydroclimatic variations during the summer monsoon season (June–September) across the Himalaya are examined over the past several hundred years using tree-ring oxygen isotope records. Owing to their strong associations with hydroclimatic variables including precipitation, relative humidity, and the Palmer Drought Severity Index, tree-ring δ18O chronologies from the Himalaya can be used to reconstruct summer monsoon intensity precisely. A regional chronology derived from five local chronologies across the Himalaya shows a significant correlation with Indian summer rainfall data. One of the most noteworthy features of the regional chronology is a drying trend over the past 180 years, indicating that summer monsoon intensity in the Himalayan region has weakened. A declining land–ocean thermal gradient over South Asia seems to be responsible for the weakened summer monsoon. By analyzing spatio-temporal correlations between zonally distributed tree-ring data over the Himalaya, we also explore possible changes in the relative contributions of source water originating in the Arabian Sea and the Bay of Bengal.
AB - Hydroclimatic variations during the summer monsoon season (June–September) across the Himalaya are examined over the past several hundred years using tree-ring oxygen isotope records. Owing to their strong associations with hydroclimatic variables including precipitation, relative humidity, and the Palmer Drought Severity Index, tree-ring δ18O chronologies from the Himalaya can be used to reconstruct summer monsoon intensity precisely. A regional chronology derived from five local chronologies across the Himalaya shows a significant correlation with Indian summer rainfall data. One of the most noteworthy features of the regional chronology is a drying trend over the past 180 years, indicating that summer monsoon intensity in the Himalayan region has weakened. A declining land–ocean thermal gradient over South Asia seems to be responsible for the weakened summer monsoon. By analyzing spatio-temporal correlations between zonally distributed tree-ring data over the Himalaya, we also explore possible changes in the relative contributions of source water originating in the Arabian Sea and the Bay of Bengal.
UR - http://www.scopus.com/inward/record.url?scp=85085457835&partnerID=8YFLogxK
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U2 - 10.1007/978-3-030-29684-1_14
DO - 10.1007/978-3-030-29684-1_14
M3 - Chapter
AN - SCOPUS:85085457835
SN - 9783030296834
SP - 261
EP - 280
BT - Himalayan Weather and Climate and their Impact on the Environment
PB - Springer International Publishing
ER -
