Temperature Anomalies in the Northern and Southern Hemispheres. Evidence of Persistence and Trends

Abstract

Abstract Northern and southern hemisphere temperature anomalies along with the difference between the two have been examined in this paper in order to estimate the time trend coefficients and the degrees of persistence in the data. Looking at the overall sample period (from 1880m1 to 2021m10) the results indicate higher degrees of persistence and more accentuated trends in the case of the northern hemisphere temperatures. We also observe some degree of persistence and a positive trend for the differenced series. Finally, observing the evolution of these two characteristics over the last 50 years, we notice that in the northern temperatures, both the degree of persistence and the time trend have increased across time but these increases are not observed in the case of the southern temperatures. JEL Code: C22; Q53; Q54