CLICK ON THE GRAPH TO SEE AN ENHANCED IMAGE
EXPLANATION OF THE GRAPH: The blue line represents the variability in the tropospheric temperature throughout 1998, which was the warmest year of the last 200 years. The average of the variability was of 0.52 °C. The green line represents the variability of the tropospheric temperature 10 meters above the sea level during 2006, in which the variability of the temperature averaged 0.34 °C.
Entering the years from 1979 to 2006, inclusively, the variability in the tropospheric temperature was 0.144 °C per decade. If we considered that the margins of the natural variability for the Holocene period are from -3 °C to 3 °C, then the global warming has not yet satisfied the lower and the upper natural limits corresponding to our era.
It is evident that 2006 has been one of the coldest years since 1998. If we compare the graph of the variability registered during 2006 at 10 meters above the sea level with the graph of the registered temperature variability for the same year at 1000 meters above the sea level, we clearly see that the oscillation in both records behaved in line with the normal oscillations. The yellow dashed lines indicate the day of October when the variation in the tropospheric temperature in 2006 was exactly the same than in 1998. There was no global warming tendency in 2006.