Assessment of trends in an intergrated climate metric-Analysis of 200 mbar zonal wind for the period 1958-2021

2022/04/25 by Nenghan Wan, Wan, Nenghan, Xiaomao Lin +3
Earth and Planetary Sciences · Environmental Science · #Atmospheric and Environmental Gas Dynamics #Atmospheric and Oceanic Physics (physics.ao-ph) #Climate variability and models #FOS: Physical sciences #Oceanographic and Atmospheric Processes

paper · pdf · doi:10.48550/arxiv.2204.11693

openalex publication_date 2022/04/25 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

Using the ERA5 and JRA-55 reanalysis datasets on latitude bands of nearly equal area, we analyze the trend of 200 mbar zonal wind anomalies for the period 1958-2021 as well as annual-mean latitude of the polar jet stream. We find basically no change of 200 mbar zonal wind in either the JRA-55 or ERA5 dataset. In addition, the polar jet core moves poleward in the Northern Hemisphere, but the movement is not statistically significant, while no poleward shift at all has occurred in the Southern Hemisphere.

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