Sensitivity of the Latitude of the Westerly Jet Stream to Climate Forcing

Chen, Gang; Zhang, Pengfei; Lu, Jian

doi:10.1029/2019GL086563

Sensitivity of the Latitude of the Westerly Jet Stream to Climate Forcing

Journal Article · Thu Feb 13 00:00:00 EST 2020 · Geophysical Research Letters

DOI:https://doi.org/10.1029/2019GL086563· OSTI ID:1599466

^[1]; Zhang, Pengfei ^[1]; ^[2]

Department of Atmospheric and Oceanic Sciences University of California Los Angeles CA USA
Atmospheric Sciences and Global Change Division Pacific Northwest National Laboratory Richland WA USA

Abstract

The latitude of the westerly jet stream is influenced by a variety of climate forcings, but their effects on the jet latitude often manifest as a tug of war between tropical forcing (e.g., tropical upper‐tropospheric warming) and polar forcing (e.g., Antarctic stratospheric cooling or Arctic amplification). Here we present a unified forcing‐feedback framework relating different climate forcings to their forced jet changes, in which the interactions between the westerly jet and synoptic eddies are synthesized by a zonal advection feedback, analogous to the feedback framework for assessing climate sensitivity. This framework is supported by a prototype feedback analysis in the atmospheric dynamical core of a climate model with diverse thermal and mechanical forcings. Our analysis indicates that the latitude of a westerly jet is most sensitive to the climate change‐induced jet speed changes near the tropopause. The equatorward jet shift also displays a larger deviation from linearity than the poleward counterpart.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

OSTI ID:: 1599466

Alternate ID(s):: OSTI ID: 1605422

Journal Information:: Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 4 Vol. 47; ISSN 0094-8276

Publisher:: American Geophysical Union (AGU)Copyright Statement

Country of Publication:: United States

Language:: English

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