Global Warming Was A Fifth Worse In The Last 150 Years Than Historical Records Show

Models appear to show a warmer world than calculations based on historical data. Why is that? lexaarts/Shutterstock
Robin Andrews 26 Jul 2016, 14:28

When making predictions, scientists tend to be quite conservative. On occasion, this can mean that they have underestimated something, and as a new comprehensive study has shown, one of these things may be the extent of historic man-made climate change.

Writing in Nature Climate Change, a team from NASA’s Jet Propulsion Laboratory (JPL) points out that there are a few “quirks” in the historical records of global temperature changes, small lapses in data collection that climatologists are acutely aware of. These range from changes in how temperature is measured in some parts of the world to there simply being not enough weather stations to get acceptable amounts of local climate readings.

As this study points out, models that circumvent these quirks, such as those used by the authoritative Intergovernmental Panel on Climate Change (IPCC), show a comparatively warmer future world than about 90 percent of calculations that are based solely on historical records. Some have pointed to these apparently cooler historical record calculations as evidence that predictive models are overestimating the degree of future global temperature rises.

This team of researchers wanted to know if applying these quirks would remove this discrepancy. They performed a series of rigorous calculations on both historical record data and commonly used climate change models, with and without the quirks taken into account, in order to attempt to replicate pre-existing, real-world data.

The team found that as much as 19 percent of air-temperature based global warming over the past 150 years may have been underrepresented in the historical record. They discovered that, when the quirks were taken into account, the historical records matched up far more closely with the modelling studies.

This means that the most recent IPCC modelling studies are absolutely not overestimating temperature changes – they really are showing us what the next few decades hold in terms of global warming.

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The Arctic is often underrepresented in terms of its temperature records. British Columbia Ministry of Transport

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