Weather and Climate Dynamics
Weather and Climate Dynamics
WCD
Articles | Volume 4, issue 2
Articles | Volume 4, issue 2
https://doi.org/10.5194/wcd-4-531-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/wcd-4-531-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 4, issue 2
Research article
 | 
22 Jun 2023
Research article |  | 22 Jun 2023

Large uncertainty in observed estimates of tropical width from the meridional stream function

Daniel Baldassare, Thomas Reichler, Piret Plink-Björklund, and Jacob Slawson

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Short summary
Using ensemble members from the ERA5 reanalysis, the most widely used method for estimating tropical-width trends, the meridional stream function, was found to have large error, particularly in the Northern Hemisphere and in the summer, because of weak gradients at the tropical edge and poor data quality. Another method, using the latitude where the surface wind switches from westerly to easterly, was found to have lower error due to better-observed data.
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