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Study debunks argument that global-warming is driven by natural factor

Study debunks argument that global-warming is driven by natural factor

Skeptics' belief that long-term global warming occurs in an unpredictable manner, independently of external drivers such as human impacts have been put to rest. A study by scientists at Duke University and NASA's Jet Propulsion Laboratory confirms that global temperature does not rise or fall chaotically in the long run. They did so by examining how Earth cools itself back down after a period of natural warming. Unless pushed by outside forces, temperature should remain stable.

Global warming is expected to have far-reaching, long-lasting and, in many cases, devastating consequences for planet Earth. A major report released Sept. 27, 2013, by the Intergovernmental Panel on Climate Change (IPCC) stated that scientists are more certain than ever of the link between human activities and global warming. More than 197 international scientific organizations agree that global warming is real and has been caused by human action.

One of the most immediate and obvious effects of global warming is the increase in temperatures around the world, said Josef Werne, an associate professor in the department of geology and planetary science at the University of Pittsburgh.

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This underscores that large, sustained changes in global temperature like those observed over the last century require drivers such as increased greenhouse gas concentrations, said lead author Patrick Brown, a PhD student at Duke's Nicholas School of the Environment. Natural climate cycles alone are insufficient to explain such changes, he said.

Brown and his colleagues published their peer-reviewed research Feb. 1 in the Journal of Climate.

Using global climate models and NASA satellite observations of Earth's energy budget from the last 15 years, the study finds that a warming Earth is able to restore its temperature equilibrium through complex and seemingly paradoxical changes in the atmosphere and the way radiative heat is transported.

Scientists have long attributed this stabilization to a phenomenon known as the Planck Response, a large increase in infrared energy that Earth emits as it warms. Acting as a safety valve of sorts, this response creates a negative radiative feedback that allows more of the accumulating heat to be released into space through the top of the atmosphere.

The new Duke-NASA research, however, shows it's not as simple as that.

A more detailed investigation of the satellite observations and climate models helped the researchers finally reconcile what was happening globally versus locally.

While global temperature tends to be stable due to the Planck Response, there are other important, previously less appreciated, mechanisms at work too, said Wenhong Li, assistant professor of climate at Duke. These other mechanisms include a net release of energy over regions that are cooler during a natural, unforced warming event. And there can be a transport of energy from the tropical Pacific to continental and polar regions where the Planck Response overwhelms positive, heat-trapping local effects.

This emphasizes the importance of large-scale energy transport and atmospheric circulation changes in restoring Earth's global temperature equilibrium after a natural, unforced warming event, Li said.

Study debunks argument that global-warming is driven by natural factor

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