Thus, the warm signal, attributed to intrusion of the TWC during interglacial maxima, is not expected to be recorded in the benthic δ18O values, thereby eliminating δ18O minima induced by warm temperatures during the interglacial maxima.
To match the signal change contrast conditions (e.g. mild versus warm), each analysis controlled for the temperature and unpleasantness ratings in the referent pain condition also (e.g. warm temperature or unpleasantness if the focus in on the mild versus warm signal change condition).
"There is a common warming signal," he said.
These are rigorously verified, globally, against average meteorological conditions and including trends such as the overall warming signal.
In each case, the study found that the greenhouse gas-global warming signal was statistically significant, supporting the robustness of the IPCC statement on human-caused global warming.
Unlike the general warming signal, any testing for the presence of trends in extremes is difficult because by definition rare events are infrequent.
At first, the years vacillate inward and outward, showing that a clear warming signal had yet to emerge from the natural fluctuations that happen from year to year.
A human-caused warming signal is embedded in the rich, year-to-year and decade-to-decade noise of natural internal climate variability.
Three of the four climate models used produce increasing damage with time, with the global warming signal emerging on time scales of 40, 113, and 170 yr, respectively.
The global warming signal is now louder than the noise of random weather, as I predicted would happen by now in the journal Science in 1981.
