Study finds global climate events in 3200years may have impacted Indian monsoons

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Global climatic events like the Roman Warm Period, Medieval Climate Anomaly, and the Little Ice Age may have had significant impacts on India's landscape, vegetation, and socio-economic growth, with abrupt shifts in the Indian Summer Monsoon (ISM) coinciding with these climatic events, a study by Indian researchers has found. 



  • The study by the Wadia Institute of Himalayan Geology, an institute of the Department of Science & Technology, shows wet monsoon conditions in the North-Western Himalaya between 1200 and 550 BCE.
  • This condition prevailed till 450 AD, coinciding with the Roman Warm Period. It was followed by reduced precipitation and a weak ISM till 950 AD and then strengthened during the Medieval Climate Anomaly between 950 and 1350 AD.
  • In a recent study published in the journal 'Quaternary International', researchers obtained grain size data, stable isotope ratios of carbon and nitrogen, total organic carbon (TOC), and total nitrogen data from the sediments of the lake.
  • The findings pointed out a revival of wet climatic conditions with a strong ISM around 1600 AD following the Little Ice Age, which prevails in present times.
  • The variability of ISM in the historical past needs to be ascertained to understand present, and future behavior of ISM as climate shifts and water supply has dictated the flourish and demise of ancient civilisations, the study said.
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