Tree ring data helps track rainfall levels

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  • Rainfall from the Asian summer monsoon, which influences water availability, ecosystems and agriculture in India, has been decreasing over the past 80 years, according to a study.
  • Man-made atmospheric pollutants are likely the reason for the decline unprecedented in the last 448 years, said researchers from the University of Arizona in the U.S.
  • The study, published in the journal Geophysical Research Letters, used tree ring records to reconstruct the Asian summer monsoon back to 1566.
  • The study found the monsoon has been weakening since the 1940s, resulting in regional droughts and hardships.
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