Impact of Weakening Jet Stream on British Isles Climate
Jet streams in warming climate show a faster increase in poles than in tropics and temperate zones. This shift affects the average position of the jet stream, likely moving it poleward. Consequently, the British Isles may experience a more Mediterranean-like climate, with deserts expanding northwards. Weakening jet streams reduce the frequency and intensity of weather bombs and associated wind storms. However, a weaker jet stream may lead to more meandering, causing blocking events and potentially increasing the occurrence of dry heatwaves and cold spells. There is also a possibility of prolonged spells of warm, wet, or cool changeable weather when the jet stream remains stationary over the British Isles.
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Presentation Transcript
Jet Stream in the Warming Climate Poles warming faster than tropics & temperate regions of the globe Jet stream average position likely to shift poleward - British Isles climate becomes more Mediterranean, subtropical deserts spread northward Lower temperature contrast reduces average jet stream strength Weaker jet stream reduces frequency and intensity of "weather bombs" & associated wind storms
- but - Weaker jet stream will probably meander more, causing more blocking events Both dry summer heatwaves and cold spells in winter may become more frequent Spells of warm wet or cool changeable weather may tend to become longer when the jet stream remains locked in position over the British Isles CAUTION These effects are speculative due to the extreme complexity of the turbulent flows near jet streams. Also regional effects may not be well represented by global climate models.
