Tibetan Tree Rings Traced Climate Change Early in 1870s

Admin | Published 2017-01-18 16:15

The Tibetan plateau is known as the third pole of the world responds sensitively to climate change than other zones in same-lying latitude. The observation of the tree-rings in the plateau showed the onset of seasonal gap in the area that started as early as in the 1870s.

Duan Jianping, a researcher at the Beijing-based Institute of Botany at the Chinese Academy of Sciences and one of the authors of the report told Sixth Tone that the findings matched with those in the previous study. The onset of a decrease in summer-to-winter temperature difference over the Tibetan Plateau matched with the rise in sulfate concentrations in the atmosphere in that period. “We wondered if climate change existed at the beginning of the industrial era, especially in places far away from the industrialization,” said Duan. “The study shows it existed.” The researchers believe that the "future human influence may further contribute to a weakening of the annual temperature cycle, with subsequent effects on ecosystem functioning and productivity." Using natural inferences with proxy data to examine past conditions, the researchers found that the region experienced a pronounced weakening of temperature seasonality of 0.18 °C reduction per decade over the 1955–2011 period. The Picea likiangensis var. balfouriana trees showed reduce radial growth rates by the interaction between snow cover and fine root mortality. According to the report, a deep snow pack in late winter has been shown to effectively reduce radial growth rates by maintaining low soil temperatures and delaying the initiation of cambial activity. Their findings are published in Nature Communications. See: Geoengineering May Use Aerosol To Repair Ozone Layer Decelerating Climate Change
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