Solar forcing of the Indian summer monsoon variability during the Ållerød period

Rapid climatic shifts across the last glacial to Holocene transition are pervasive feature of the North Atlantic as well as low latitude proxy archives. Our decadal to centennial scale record of summer monsoon proxy Globigerina bulloides from rapidly accumulating sediments from Hole 723A, Arabian Se...

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Bibliographic Details
Published in:Scientific Reports
Main Authors: Gupta, Anil K., Mohan, Kuppusamy, Das, Moumita, Singh, Raj K.
Format: Text
Language:English
Published: Nature Publishing Group 2013
Subjects:
Article
Indian
North Atlantic
Online Access:http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3782882
http://www.ncbi.nlm.nih.gov/pubmed/24067487
https://doi.org/10.1038/srep02753
Description
Summary:Rapid climatic shifts across the last glacial to Holocene transition are pervasive feature of the North Atlantic as well as low latitude proxy archives. Our decadal to centennial scale record of summer monsoon proxy Globigerina bulloides from rapidly accumulating sediments from Hole 723A, Arabian Sea shows two distinct intervals of weak summer monsoon wind coinciding with cold periods within Ållerød inerstadial of the North Atlantic named here as IACP-A1 and IACP-A2 and dated (within dating uncertainties) at 13.5 and 13.3 calibrated kilo years before the present (cal kyr BP), respectively. Spectral analysis of the Globigerina bulloides time series for the segment 13.6–13.1 kyr (Ållerød period) reveals a strong solar 208-year cycle also known as de Vries or Suess cycle, suggesting that the centennial scale variability in Indian summer monsoon winds during the Ållerød inerstadial was driven by changes in the solar irradiance through stratospheric-tropospheric interactions.

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