Eddy sensitivity to jet characteristics

Eddy sensitivity to jet characteristics AbstractThe atmosphere exhibits two distinct types of jets: the thermally driven subtropical jet and the more poleward eddy-driven jet. Depending on location and season these jets are often merged or separated, and their position, structure and intensity strongly influence the eddy fields. Here, we study the sensitivity of eddies to changes in the jets’ amplitude and position in an idealized general circulation model. A modified Newtonian relaxation scheme that has a very short relaxation time for the mean state, and a long relaxation time for eddies is used. This scheme allows obtaining any zonally symmetric temperature distribution, and is used to systematically modify the jets’ amplitude and location. It is found that eddies are more sensitive to changes in the amplitude of the eddy-driven jet than to changes in the amplitude of the subtropical jet. Furthermore, when the eddy-driven jet is shifted poleward, eddies tend to intensify. These results are tested for robustness in two different reference simulations, one resembling a situation where the subtropical and eddy-driven jets are nearly merged, and one when they are separated. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of the Atmospheric Sciences American Meteorological Society

Eddy sensitivity to jet characteristics

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Publisher
American Meteorological Society
Copyright
Copyright © American Meteorological Society
ISSN
1520-0469
D.O.I.
10.1175/JAS-D-17-0139.1
Publisher site
See Article on Publisher Site

Abstract

AbstractThe atmosphere exhibits two distinct types of jets: the thermally driven subtropical jet and the more poleward eddy-driven jet. Depending on location and season these jets are often merged or separated, and their position, structure and intensity strongly influence the eddy fields. Here, we study the sensitivity of eddies to changes in the jets’ amplitude and position in an idealized general circulation model. A modified Newtonian relaxation scheme that has a very short relaxation time for the mean state, and a long relaxation time for eddies is used. This scheme allows obtaining any zonally symmetric temperature distribution, and is used to systematically modify the jets’ amplitude and location. It is found that eddies are more sensitive to changes in the amplitude of the eddy-driven jet than to changes in the amplitude of the subtropical jet. Furthermore, when the eddy-driven jet is shifted poleward, eddies tend to intensify. These results are tested for robustness in two different reference simulations, one resembling a situation where the subtropical and eddy-driven jets are nearly merged, and one when they are separated.

Journal

Journal of the Atmospheric SciencesAmerican Meteorological Society

Published: Feb 14, 2018

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