Frequency‐Dependent Behavior of Zonal Jet Variability
Name
Geophysical Research Letters - 2020 - Lindgren - Frequency‐Dependent Behavior of Zonal Jet Variability.pdf
Description
Published version
Size
1.61 MB
Format
Adobe PDF
Checksum (MD5)
389f81678f3800a5860e6b84a17e9a9f
Author(s)
Lindgren, Erik A
Sheshadri, Aditi
Plumb, R Alan
Date Issued
March 12, 2020
Journal
Geophysical Research Letters
Publisher
American Geophysical Union
Citation
Lindgren, E. A., Sheshadri, A., & Plumb, R. A. (2020). Frequency-dependent behavior of zonal jet variability. Geophysical Research Letters, 47, e2019GL086585.
Version
Final published version
Abstract
Recent work suggests that storm track diagnostics such as eddy heat fluxes and eddy kinetic energies have very small signatures in the first annular mode of zonal mean zonal wind, suggesting a lack of co‐variability between the locations of the extratropical jet and storm tracks. The frequency‐dependence of this apparent decoupling is explored in ERA‐Interim reanalysis data. The annular modes show similar spatial characteristics in the different frequency ranges considered. Cancellation between the signatures of storm track diagnostics in the leading low‐pass and high‐pass filtered annular modes is evident, partly explaining their small signature in the total. It is shown that at timescales greater than 30 days, the first zonal wind mode describes latitudinal shifts of both the midlatitude jet and its associated storm tracks, and it appears that the persistence of zonal wind anomalies is sustained primarily by a baroclinic feedback.
MIT Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1029/2019gl086585
