## Trends in the Surface Meridional Temperature Gradient

April, 1997

Tech Report

### Author(s)

Alix I. Gitelman, James S. Risbey, Robert E. Kass, and Richard D. Rosen

### Abstract

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 30-35N belt and the 50-55N 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 0.4$$\pm$$0.1C per 100 years, along with indications of substantial multidecadal variability.