Anti-persistence in the global temperature anomaly field
- 1Dept. of Atmospheric Sciences, University of São Paulo, Brazil
- 2Dept. of Mathematical Sciences, Atmospheric Sciences Group, University of Wisconsin, Milwaukee, USA
- 3Institute for Computational Earth System Sciences, University of California, Santa Barbara, USA
- 4Dept. of Physical Oceanography, University of São Paulo, Brazil
Abstract. In this study, low-frequency variations in temperature anomaly are investigated by mapping temperature anomaly records onto random walks. We show evidence that global overturns in trends of temperature anomalies occur on decadal time-scales as part of the natural variability of the climate system. Paleoclimatic summer records in Europe and New-Zealand provide further support for these findings as they indicate that anti-persistence of temperature anomalies on decadal time-scale have occurred in the last 226 yrs. Atmospheric processes in the subtropics and mid-latitudes of the SH and interactions with the Southern Oceans seem to play an important role to moderate global variations of temperature on decadal time-scales.