Human influence on climate change is traced back to the 19th century

Human influence on climate change is traced back to the 19th century
A graphic illustration for the anthropogenic-induced decrease in the difference of summer and winter temperatures. The thermometers represent the difference between summer and winter temperatures. Credit: Jianping Duan

Climate change poses a serious challenge to the human society and it is generally believed that humans are themselves to blame. The Intergovernmental Panel on Climate Change has concluded that, with high confidence, human activities are responsible for the continuing rise of global mean surface air temperature since the 1950s.

A recent article published in the journal Nature Sustainability by Duan et al. has shown that on can be traced back to the late 19th century based on summer-winter temperature difference. This research has been carried out by scientists from the Institute of Atmospheric Physics, Chinese Academy of Sciences in collaboration with leading experts on from the UK and Germany.

"it is well known that humans are driving global warming, but when did this begin?" said the lead author, Dr. Jianping Duan, "Our study has shown that anthropogenic influence on climate change started much earlier than we previously believe."

Anthropogenic climate change is usually focused on the rise of surface air temperature, namely global warming, and the increase of climate extremes. Duan et al. (2019) have found that the amplitude of seasonal temperature fluctuations has been decreasing widely, and this trend can be traced back to the late 19th century. They find that temperature seasonality had been stable until 1860s, from which there have been continuous downward trends across northern hemisphere mid-high latitudes.

A formal detection and attribution analysis using the latest climate model simulations has shown that increased greenhouse gas concentrations and anthropogenic aerosols are the main contributors to the observed downward trends.


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More information: Detection of human influences on temperature seasonality from the nineteenth century, Nature Sustainability (2019). DOI: 10.1038/s41893-019-0276-4 , https://www.nature.com/articles/s41893-019-0276-4
Journal information: Nature Sustainability

Citation: Human influence on climate change is traced back to the 19th century (2019, April 22) retrieved 24 June 2019 from https://phys.org/news/2019-04-human-climate-19th-century.html
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Apr 23, 2019
Interesting method, it seems more sensitive than earlier ones.

There is also an open question if not humans changed the climate at the start of the current interglacial by starting farming [ http://www.realcl...-update/ ]. "For over a decade, paleoclimate scientists have argued whether the warmth of the last several thousand years was natural or anthropogenic. ... a major shift in viewpoint of published papers: 30 papers favor aspects of the EAH, 6 papers oppose it, and 5 are in the middle."

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