Researchers found that an increase in crop water demand explains a great deal of 'half of the cumulative deficits of the agricultural water balance' since 1980.
Crop water demand in California's San Joaquin Valley has increased to the size of a major reservoir in just 12 years due to climate change, a study has found.An integral region for agriculture, particularly in fruit and nut production, it has been subjected in the past 10 years to severe drought conditions, with extreme temperatures that have evaporated water supply.
That is more than 800 gallons a year, which equates to the amount of water in a large reservoir, the study reported.'While it is clear that the atmosphere has warmed, the measurable break to a new, warmer regime impacting agriculture across both wet and dry cycles is eye-catching,' Viers said. 'This isn't a gradual phenomenon, but rather an upward regime shift in evapotranspirative demand.
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