Abstract
This study explores the relationship between latitudinal shifts in the eddy-driven jet and in the Hadley cell edge as depicted in models and reanalyses. We calculate an interannual shift ratio of approximately 1.5:1 between the eddy-driven jet and the Hadley cell edge over the Southern Hemisphere during austral summer in model data. We further find that the ratio varies from season to season, with similarities between corresponding seasons over each hemisphere. Ratios are broadly consistent between models in this study, and appear to be realistic when compared to those from reanalyses. Mean tropical SSTs and the strength of zonal winds in the tropics appear to be critical to determining the ratio, while sea surface temperature variability is not. We argue that conditions in the tropics act to modulate the effect of midlatitude eddies on the Hadley cell, and the action of eddies in turn explains most of the correlated shifts from year to year. In contrast, the mean state of the tropics is a poor predictor of both the ratio of observed trends in reanalyses and the ratio of modeled externally forced shifts. We show that the ratios of modeled shifts are dependent on the type of external forcing.
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Notes
We integrate to 90° in all cases, since the poleward edge of the Ferrel cell is often poorly defined. This necessitates masking out any oppositely signed polar circulation that may be present.
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Acknowledgments
The authors thank two anonymous reviewers for their helpful suggestions. The work described in this publication was performed at the University of Utah department of Atmospheric Sciences. The writing and publication of this publication was supported by the JPL, Caltech, under a contract with NASA. We acknowledge the Program for Climate Model Diagnosis and Intercomparison (PCMDI) and the WCRP Working Group on Coupled Modelling (WGCM) for their roles in making available the WCRP CMIP3 multi-model dataset. We likewise acknowledge GFDL for making available their model framework and data. We thank the University of Utah Center for High Performance Computing (CHPC) for computing support. This research makes use of NCAR model data obtained from the NCAR Earth System Grid, as well as resources of the National Energy Research Scientific Computing Center, which is supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. This research was funded in part by a NSF-GK12 grant.
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Staten, P.W., Reichler, T. On the ratio between shifts in the eddy-driven jet and the Hadley cell edge. Clim Dyn 42, 1229–1242 (2014). https://doi.org/10.1007/s00382-013-1905-7
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DOI: https://doi.org/10.1007/s00382-013-1905-7