Mar 29, 2012
Perception of climate change
by
,
Proceedings of the National Academy of Sciences
- States that “climate dice,” describing the chance of unusually warm or cool seasons, have become more and more “loaded” in the past 30 y, coincident with rapid global warming
- Finds the distribution of seasonal mean temperature anomalies has shifted toward higher temperatures and the range of anomalies has increased
- Finds an important change is the emergence of a category of summertime extremely hot outliers, more than three standard deviations (3σ) warmer than the climatology of the 1951–1980 base period
- Holds that this hot extreme, which covered much less than 1% of Earth’s surface during the base period, now typically covers about 10% of the land area
- Says it follows that we can state, with a high degree of confidence, that extreme anomalies such as those in Texas and Oklahoma in 2011 and Moscow in 2010 were a consequence of global warming because their likelihood in the absence of global warming was exceedingly small
- Discusses the practical implications of this substantial, growing, climate change