Lead author, Dr Kai Kornhuber from the University of Oxford\u2019s Department of Physics and Colombia University\u2019s Earth Institute, said: \u2018Co-occurring heatwaves will become more severe in the coming decades if greenhouse gases are not mitigated. In an interconnected world, this can lead to food price spikes and have impacts on food availability even in remote regions not directly affected by heatwaves.<\/p>\n
\u2018We found a 20-fold increase in the risk of simultaneous heatwaves in major crop producing regions when these global scale wind patterns are in place. Until now this was an underexplored vulnerability in the food system. We have found that during these events there actually is a global structure in the otherwise quite chaotic circulation. The bell can ring in multiple regions at once and the impacts of those specific interconnections were not quantified previously.\u2019<\/p>\n
Western North America, Western Europe and the Caspian Sea region are particularly susceptible to these atmospheric patterns that get heat and drought locked into one place simultaneously where they then affect crops production yields.<\/p>\n
Dr Dim Coumou, co-author from the Institute for Environmental Studies at VU Amsterdam, said: \u2018Normally low harvests in one region are expected to be balanced out by good harvests elsewhere but these waves can cause reduced harvests in several important breadbaskets simultaneously, creating risks for global food production.\u2019<\/p>\n
Dr Elisabeth Vogel, co-author from Melbourne University, said: \u2018During years in which two or more summer weeks featured the amplified wave pattern, cereal crop production was reduced by more than 10% in individual regions, and by 4% when averaged across all crop regions affected by the pattern.\u2019<\/p>\n
Dr Radley Horton, co-author from the Lamont-Doherty Earth Observatory at Colombia University, said: \u2018If climate models are unable to reproduce these wave patterns, risk managers such as reinsurers and food security experts may face a blind spot when assessing how simultaneous heat waves and their impacts could change in a warming climate.\u2019<\/p>\n
The scientists conclude that a thorough understanding of what drives this jet stream behavior could ultimately improve seasonal predictions of agricultural production at the global scale and inform risk assessments of harvest failures across multiple food-producing regions.<\/p>\n
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<\/p>\n","protected":false},"excerpt":{"rendered":"
Researchers at Oxford University, together with and international colleagues, have discovered jet stream patterns that could affect up to a quarter of global food production. In a new study published today in\u00a0Nature Climate Change,\u00a0scientists show how specific wave patterns in the jet stream strongly increase the chance of co-occurring heatwaves in major food producing regions […]<\/p>\n","protected":false},"author":410,"featured_media":48108,"comment_status":"open","ping_status":"open","sticky":true,"template":"","format":"standard","meta":{"footnotes":""},"categories":[984,6030],"tags":[6325,7664,7466],"yoast_head":"\n