The rapid development of unexpected drought, called flash drought, can severely impact agricultural and ecological systems with ripple effects that extend even further. Researchers at the University of Oklahoma are assessing how our warming climate will affect the frequency of flash droughts and the risk to croplands globally. Jordan Christian, a postdoctoral researcher, is the lead author of the study, “Global projections of flash drought show increased risk in a warming climate,” published today in Nature Communications Earth and Environment.
“In this study, projected changes in flash drought frequency and cropland risk from flash drought are quantified using global climate model simulations,” Christian said. “We find that flash drought occurrence is expected to increase globally among all scenarios, with the sharpest increases seen in scenarios with higher radiative forcing and greater fossil fuel usage.”
Radiative forcing describes the imbalance of radiation where more radiation enters Earth’s atmosphere than leaves it. Like burning fossil fuels, these activities are among the most significant contributors to climate warming. The changing climate is expected to increase severe weather events from storms, flash flooding, flash droughts and more.
“Flash drought risk over cropland is expected to increase globally, with the largest increases projected across North America and Europe,” Christian said.
“CMIP6 models projected a 1.5 times increase in the annual risk of flash droughts over croplands across North America by 2100, from the 2015 baseline of a 32% yearly risk in 2015 to 49% in 2100, while Europe is expected to have the largest increase in the most extreme emissions scenario (32% to 53%), a 1.7 times increase in annual risk,” he said.
“This study continues to emphasize that agricultural producers, both domestic and abroad, will face increasing risks associated with water availability due to the rapid development of drought. As a result, socioeconomic pressures associated with food production, including higher prices and social unrest, will also increase when crop losses occur due to flash drought,” Basara said.
Fig. 3: Flash drought risk over cropland. From: Global projections of flash drought show increased risk in a warming climate
The multi-model mean of the yearly percentage of cropland experiencing flash drought over entire continents for the historical (black), SSP126 (blue), SSP245 (orange), and SSP585 (red) scenarios. A 30-year centered moving average is applied to each time series. The shaded regions indicate the variability (±1σ) among the 30-year centered moving averages between all six models for the corresponding historical and future scenarios.
Sources:
The University of Oklahoma
Provided by the IKCEST Disaster Risk Reduction Knowledge Service System
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