Increased extreme hourly precipitation over China's rice paddies from 1961 to 2012.

For late rice, all four indices showed upward tendencies during periods 1 and 2, of which the proportion of extreme precipitation showed a significant trend (2.6% to 3.1% per decade, p < 0.01).

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A positive Z value indicates an increasing trend while a negative Z value indicates a decreasing trend.

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By analyzing 265 stations in South Asia in 1961–2000, an increasing trend of extreme precipitation was identified in tropical regions, while decreasing in the Himalaya and desert regions 15 .

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This study found a positive trend of the frequency (2.5–7.5% per decade) in Northeast China and the middle and lower reaches of the Yangtze river Basin, while not evident for the intensity.

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