Science Source
Recent enhanced high-summer North Atlantic Jet variability emerges from three-century context
- States that a recent increase in mid-latitude extreme weather events has been linked to Northern Hemisphere polar jet stream anomalies
- States that a long-term, historical perspective of jet stream variability is needed
- Combines two tree-ring records from the British Isles and the northeastern Mediterranean to reconstruct variability in the latitudinal position of the high-summer North Atlantic Jet (NAJ) back to 1725 CE
- Finds that northward NAJ anomalies have resulted in heatwaves and droughts in northwestern Europe and southward anomalies have promoted wildfires in southeastern Europe
- Finds an unprecedented increase in NAJ variance since the 1960s, which co-occurs with enhanced late twentieth century variance in the Central and North Pacific Basin
- Results suggest increased late twentieth century interannual meridional jet stream variability and support more sinuous jet stream patterns and quasi-resonant amplification as potential dynamic pathways for Arctic warming to influence mid-latitude weather
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Headline
Jan 17, 2018 | Weather Underground | Category 6
Extreme Temperature Workout: The Gyrations of January 2018
