"Surge in Mercury Emissions as Global Warming Melts Antarctic Glaciers"

A Chinese research team has analyzed that a large amount of mercury, which has long been trapped in glaciers and other ice, is being released as glaciers on the Antarctic Peninsula melt due to global warming.

According to the Global Times, an English-language newspaper affiliated with the People's Daily, the official newspaper of the Chinese Communist Party, on September 1, a research team from the College of Urban and Environmental Sciences at Peking University recently published the results of this study in the Proceedings of the National Academy of Sciences (PNAS).

The research team analyzed that human-induced mercury emissions and global warming have jointly accelerated the mercury cycle in the Antarctic Peninsula since the industrialization era, and that continuous warming is transforming the region's cryosphere from a long-term "storage reservoir" for mercury into an "emission source" that releases it back out.

The cryosphere refers collectively to areas on Earth where water is in a solid state, including glaciers, snow, sea ice, and permafrost.

The Antarctic Peninsula is one of the regions experiencing the fastest warming and glacier retreat in Antarctica, with a warming rate about six times the global average, the research team explained.

In particular, the research team claimed that, based on an analysis combining sediment records, mercury isotope tracing, and multi-media modeling, terrestrial mercury emissions resulting from glacier melting have increased by 550% compared to the pre-industrial era.

They also added that approximately 6.5 tons of mercury flow into the ocean every year through melted glacier water and sediments, which is a level similar to the amount of mercury deposited from the atmosphere over the same area.

The researchers pointed out that a similar phenomenon is likely to occur in high-altitude cryosphere regions, including the Himalayas.

Some pollutants, such as mercury transported through atmospheric circulation, can accumulate over a long period in snow, glaciers, permafrost, and high-altitude soil, and then, as glaciers retreat or permafrost thaws and erosion intensifies, the stored pollutants can be released again and travel downstream.

However, researcher Liu stated, "The concentration of pollutants in remote alpine and cryosphere environments is generally low, and the released pollutants are also subject to effects such as dilution, sedimentation, and transformation," adding, "Whether this leads to actual ecological risks must be confirmed through field observations."

Liu also added that the public does not need to be excessively concerned.

Meanwhile, interest in the impact of climate change on high-altitude cryosphere regions has also grown following recent large-scale glacier-related disasters in the border region between China and Nepal.

Researcher Liu suggested that this disaster shows how sensitive the high-altitude cryosphere is to temperature changes, and that a system is needed in future risk management to comprehensively address disasters, pollution, ecology, and health.

He also argued that baseline monitoring of various factors should be conducted in high-risk river basins, and that geological, hydrological, and water quality observations should be closely linked with mountain disaster early warning systems.

In addition, he added that it is necessary to expand the sharing of cross-border observation data, strengthen international cooperation under United Nations (UN) related bodies and the Minamata Convention on Mercury framework, and incorporate the risk of re-emission of pollutants stored in the cryosphere into early warning systems.
※ Please note: This article was translated by AI and may contain errors.