Fast-get-faster explains wavier upper-level jet stream under climate change
Shaw, T. A., Miyawaki, O., Chou, H., Blackport, R.. (2024). Fast-get-faster explains wavier upper-level jet stream under climate change. Communications Earth & Environment, doi:https://doi.org/10.1038/s43247-024-01819-4
| Title | Fast-get-faster explains wavier upper-level jet stream under climate change |
|---|---|
| Genre | Article |
| Author(s) | T. A. Shaw, Osamu Miyawaki, H. Chou, R. Blackport |
| Abstract | Earth’s upper-level jet streams primarily flow in the eastward direction. They often exhibit a north-south component or waviness connected to extreme weather at the surface. Recently the upper-level eastward jet stream was found to exhibit a fast-get-faster response under climate change explained by the impact of the nonlinear Clausius-Clapeyron relation on the latitudinal density contrast. Here we show the fast-get-faster mechanism also applies to the upper-level north-south jet stream wind and the longitudinal density contrast, implying increased waviness under climate change. Arctic Sea ice loss, which has been proposed as a driver of increased waviness, cannot explain the response. It leads to a fast-get-slower waviness response at all vertical levels. We demonstrate the fast-get-faster waviness signal has emerged in reanalysis data in the Southern Hemisphere but not yet in the Northern Hemisphere. The results show the fast-get-faster mechanism explains upper-level waviness changes and highlights a tug of war between upper- and mid-level waviness under climate change. |
| Publication Title | Communications Earth & Environment |
| Publication Date | Dec 1, 2024 |
| Publisher's Version of Record | https://doi.org/10.1038/s43247-024-01819-4 |
| OpenSky Citable URL | https://n2t.net/ark:/85065/d7v69pxr |
| OpenSky Listing | View on OpenSky |
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