Net benefits to US soy and maize yields from intensifying hourly rainfall

Corey Lesk (), Ethan Coffel and Radley Horton
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Corey Lesk: Lamont–Doherty Earth Observatory
Ethan Coffel: Dartmouth College
Radley Horton: Lamont–Doherty Earth Observatory

Nature Climate Change, 2020, vol. 10, issue 9, 819-822

Abstract: Abstract Many varieties of short-duration extreme weather pose a threat to global crop production, food security and farmer livelihoods1–4. Hourly exposure to extreme heat has been identified as detrimental to crop yields1,5; however, the influence of hourly rainfall intensity and extremes on yields remains unknown4,6,7. Here, we show that while maize and soy yields in the United States are severely damaged by the rarest hourly rainfall extremes (≥50 mm hr−1), they benefit from heavy rainfall up to 20 mm hr−1, roughly the heaviest downpour of the year on average. We also find that yields decrease in response to drizzle (0.1–1 mm hr−1), revealing a complex pattern of yield sensitivity across the range of hourly intensities. We project that crop yields will benefit by ~1–3% on average due to projected future rainfall intensification under climate warming8,9, slightly offsetting the larger expected yield declines from excess heat, with the benefits of more heavy rainfall hours outweighing the damages due to additional extremes. Our results challenge the view that an increasing frequency of high-intensity rainfall events poses an unequivocal risk to crop yields2,7,10 and provide insights that may guide adaptive crop management and improve crop models.

Date: 2020
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DOI: 10.1038/s41558-020-0830-0

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