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The Dynamical Relationship between Subtropical and Eddy-Driven Jets

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  • 1 Department of Meteorology, The Pennsylvania State University, University Park, Pennsylvania
  • 2 Climate Prediction Center, National Centers for Environmental Prediction, Camp Springs, Maryland
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Abstract

This study examines the impact of a subtropical jet on the development of baroclinic waves and polar-front jets with an idealized multilevel primitive equation model. Linear stability analysis and initial-value approaches suggest that baroclinic wave growth is most favored along the subtropical jet only when this jet is sufficiently strong. For a subtropical jet of modest strength, the most favorable region for baroclinic wave growth often lies 20° to 30° poleward of the subtropical jet, establishing an eddy-driven jet that is latitudinally well separated from the subtropical jet.

Corresponding author address: Dr. Sukyoung Lee, The Pennsylvania State University, 503 Walker Bldg., University Park, PA 16802. Email: sl@essc.psu.edu

Abstract

This study examines the impact of a subtropical jet on the development of baroclinic waves and polar-front jets with an idealized multilevel primitive equation model. Linear stability analysis and initial-value approaches suggest that baroclinic wave growth is most favored along the subtropical jet only when this jet is sufficiently strong. For a subtropical jet of modest strength, the most favorable region for baroclinic wave growth often lies 20° to 30° poleward of the subtropical jet, establishing an eddy-driven jet that is latitudinally well separated from the subtropical jet.

Corresponding author address: Dr. Sukyoung Lee, The Pennsylvania State University, 503 Walker Bldg., University Park, PA 16802. Email: sl@essc.psu.edu

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