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The jet stream that brought the storm Eunice has been faster over the last century

The location of the average seasonal jet stream that overlaps the temperature of 2 m during the period 1871-2011. The dark blue line shows the location of the average jet stream, and the green line is based on 56 ensemble members and is smoothed every 6 hours for 91 days using the Parzen filter for the period shown. Indicates the ± 2 standard deviation of. The cyan blue line is ± 2 standard deviations of the jet latitude every 6 hours smoothed over 91 days using the Parzen filter, based on aging over the period shown. The jet stream overlaps with a seasonal average of 2m. Credit: DOI: 10.1007 / s00382-022-06185-5

According to a new study at the University of Southampton, winter jet streams in the North Atlantic and Eurasia have increased average speeds from 8% to 132 miles per hour. This week, the jet stream that brought the Dudley, Eunice, and Franklin storms to Britain also moved up to 330 kilometers north.


The findings are relevant for 141 years from 1871 to 2011.

A jet stream is a fast band of air that flows around the world about 10,000 meters above the surface of the earth. They have a significant impact on storm activity and temperature patterns throughout the Northern Hemisphere, where strong winds and floods can affect the weather. This is the longest area studies of jet streams in the Northern Hemisphere, and the observed trends are potential indicators of climate change.

New research published in Climate dynamicsProvided a comparison of jet streams in the Northern Hemisphere across the ocean and continents, and found that jet stream trends vary by region and season. Between 1871 and 2011, the average winter movement of jet stream latitudes over the North Atlantic was 44 ° to 47 ° north, with an increase in velocity of 10 mph, but increased in the North Pacific. Was not observed.

The study was led by Dr. Samantha Haram of the University of Maynooth, Ireland, while she received her PhD. At the University of Southampton.

Dr. Haram said: “In the North Atlantic and Eurasia, we see significant increases in winter jet latitude and velocity. These changes are consistent with the decrease in temperature and increase in pressure gradient observed between the Equator and the Arctic during the period. The warming Arctic winter. “

“In the North Pacific, we do not see any increase in jet latitude or velocity, but changes in North Pacific sea surface temperature account for more than 50% of jet latitude fluctuations.”

The result emphasizes that Northern hemisphere Jet variability and trends vary by region in the North Atlantic, North Pacific, Eurasia, and North America. This is important in making climate forecasts and planning to combat climate change.

These findings are the result of a statistical analysis of a 250mb jet stream using a 20th century reanalysis dataset.


Non-linear effect of wind on Atlantic circulation


For more information:
Samantha Hallam et al, Northern Hemisphere Jet Stream 1871–2011 Seasonal and 10-Year Regional (Land-Sea) Comparison, Climate dynamics (2022). DOI: 10.1007 / s00382-022-06185-5

Quote: The jet stream that brought about the storm Eunice accelerated in the last century (February 22, 2022). Obtained February 22, 2022 from https: //phys.org/news/2022-02-jet-stream-brought-storm-eunice.html.

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The jet stream that brought the storm Eunice has been faster over the last century

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