Trends in the Surface Meridional Temperature Gradient
Alix I. Gitelman, James S. Risbey, Robert
E. Kass, and Richard D. Rosen
Given the presence of a meridional temperature gradient (MTG) across
midlatitudes, large-scale eddies transport heat poleward, thereby
shaping Earth's climate. Defining an MTG index here as the
difference in surface temperature between the
--N belt and the --N
belt, we use a temperature record compiled from observations over a
110-year period to determine a trend in the MTG in the last century.
We find a significant decreasing trend in the MTG over this period
of C per 100 years, along with indications of
substantial multidecadal variability.
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