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Monsoon drought visible in tree rings

Tree growth rings in America have given an insight into the effects of long-term droughts due to monsoon failure.

Common belief is that dry winter seasons are generally followed by a wet monsoon season, and vice versa. However, new research into tree growth has found that severe droughts that can last for many decades often feature very sparse winter and summer rains, rather than a prolonged period of one or the other.

In fact, it is the absence of summer monsoon rains, rather than dry winter periods, that are the main culprits for prolonged drought.

Read more at University of Arizona

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