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Synchronous Eurasian heat extremes tied to boreal summer combined extratropical intraseasonal waves
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2024
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Source: npj Climate and Atmospheric Science, 7(1)
[PDF-4.67 MB]
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Journal Title:npj Climate and Atmospheric Science
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Description:Heat extremes frequently hit different regions synchronously during boreal summer over the Eurasian continent. A remarkable coupling is first revealed between Eurasian heat extreme occurrence and individual extratropical intraseasonal oscillation (EISO). Further, the combined EISOs facilitate and largely increase the occurrence probabilities of synchronous Eurasian heat extremes. These dominant combined EISOs together contribute 20–45% to the total heat extreme days over the five Eurasian regions where the climatological heat extremes occur most frequently. A multi-model hindcast further shows that the subseasonal prediction exhibits higher skills for synchronous heat extremes over the combined-EISO hotspot regions when the associated combined EISOs are active, supporting the notion that the monitoring and prediction of EISOs are crucial for heat extremes’ early warning. Skillful prediction of EISOs opens a pathway for heat extremes’ prediction by extending it from the weather to the subseasonal timescales.
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Source:npj Climate and Atmospheric Science, 7(1)
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ISSN:2397-3722
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Rights Information:CC BY
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