Simulation explains Greenland’s later summer warming

The slowdown in summer warming and ice loss in Greenland over the last decade has been linked to El Nino’s shift to events over the Central Pacific through remote coercion of the atmosphere.Credit: Shinji Matsumura

A mysterious decade-long slowdown in summer warming across Greenland was explained by researchers at Hokkaido University in Japan. Their observational analysis and computer simulations have revealed that changes in sea surface temperature in the tropical Pacific, thousands of miles south, cause cooler summer temperatures throughout Greenland.Results published in the journal Communication Earth and environmentHelps improve future predictions that the Greenland ice sheet and Arctic sea ice will melt in the coming decades.

“The Greenland ice sheet is in the long run global warming Related to Greenhouse gas emissions“But the pace of melting has slowed in the last decade,” said Shinji Matsumura, an environmental geoscientist at Hokkaido University. The slowdown was a mystery until it became clear in. “”

El Nino is a natural periodic phenomenon that raises the water temperature of the central and eastern central equatorial Pacific Ocean.Scientists know that such large-scale changes will change Atmospheric conditions It is elsewhere due to its association with a powerful wave of pressure called teleconnection. However, climate experts struggled to find a way for El Nino in the Pacific to cool Greenland in the summer, as tropical easterly winds usually hinder the formation of such teleconnections.

In a new study, the team described recent changes in the Pacific El Nino event. This pushed the warmer sea temperatures further north. This allowed us to form an atmospheric teleconnection that extends to Greenland beyond the effects of the East Wind.

Second, these teleconnections disrupt atmospheric conditions and thus the weather around Greenland in the summer. Specifically, they drive a more intense cyclone, which moves colder air over land. This is enough to explain that the temperature and ice melting in the area are lower than expected, according to new research. Both the temperature and rate of ice sheet melting peaked in 2012.

“The findings and the slowdown in Greenland’s summer warming do not undermine the seriousness of climate change and the need to address greenhouse gas emissions,” Matsumura emphasizes. Rather, they show how changes in nature work with long-term global warming trends to change the situation in the region. The slowdown in warming is local to Greenland. The wider Arctic Circle is one of the warmest places on earth.

The El Nino phenomenon tends to be followed by similar but different natural climate change called La Niña, which lowers sea surface temperatures. These events tend to bring high temperatures to Greenland.

“Global warming and ice sheet melting in Greenland and other parts of the Arctic are expected to accelerate in the future due to the effects of anthropogenic warming,” says Matsumura.

Simulations show that there is a long delay in the impact of global warming on the volume of the Greenland ice sheet.

For more information:
Shinji Matsumura et al., The slowdown of summer warming in Greenland over the last decade related to El Nino in the Central Pacific, Communication Earth and environment (2021). DOI: 10.1038 / s43247-021-00329-x

Quote: Simulation taken from on April 6, 2022 Greenland’s later summer warming (2022) April 6) is explained

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Simulation explains Greenland’s later summer warming

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