Roundup: Tragedy in Antarctica, Antimony and Glacier Risks

Roundup: Tragedy, Antimony and Risk

 

Prominent Climate Scientist Dies in Antarctica

New York Times: “Gordon Hamilton, a prominent climate scientist who studied glaciers and their impact on sea levels in a warming climate, died in Antarctica when the snowmobile he was riding plunged into a 100-foot-deep crevasse. He was an associate research professor in the glaciology group at the Climate Change Institute at the University of Maine. He was camping with his research team on what is known as the Shear Zone, where two ice shelves meet in an expanse three miles wide and 125 miles long. Parts of the Shear Zone can be up to 650 feet thick and ‘intensely crevassed.’ Dr. Hamilton’s research, aided by a pair of robots equipped with ground-penetrating radar instruments, focused on the impact of a warming climate on sea levels. He was working with an operations team to identify crevasses.”

Learn more about the tragedy here.

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Professor Gordon Hamilton (Source: University of Maine).

 

Antimony Found in the Tibetan Glacial Snow

Journal of Asian Earth Sciences: “Antimony (Sb) is a ubiquitous element in the environment that is potentially toxic at very low concentrations. In this study, surface snow/ice and snowpit samples were collected from four glaciers in the southeastern Tibetan Plateau in June 2015… The average Sb concentration in the study area was comparable to that recorded in a Mt. Everest ice core and higher than that in Arctic and Antarctic snow/ice but much lower than that in Tien Shan and Alps ice cores… Backward trajectories revealed that the air mass arriving at the southeastern Tibetan Plateau mostly originated from the Bay of Bengal and the South Asia in June. Thus, pollutants from the South Asia could play an important role in Sb deposition in the studied region. The released Sb from glacier meltwater in the Tibetan Plateau and surrounding areas might pose a risk to the livelihoods and well-being of those in downstream regions.”

Read more about the research here.

Location map showing the sampling glaciers in the southeastern Tibetan Plateau. The red dots represent the location of the four investigated glaciers, and the size represents the average concentrations of Sb in the separate glacier.
Location map showing glaciers in the Tibetan Plateau (Source: Elsevier Ltd).

 

Managing Glacier Related Risks Disaster in Peru

The Climate Change Adaption Strategies: A recently edited book, “The Climate Change Adaptation Strategies – An Upstream – Downstream Perspective,” edited by Nadine Salzmann et al., has several chapters on glaciers. The chapter “Managing Glacier Related Risks Disaster in the Chucchún Catchment, Cordillera Blanca, Peru” discusses some of these glacier related risks: “Glacial lakes hazards have been a constant factor in the population of the Cordillera Blanca due their potential to generate glacial lake outburst floods (GLOF) caused by climate change. In response, the Glaciares Project has been carried out to implement three strategies to reduce risks in the Chucchún catchment through: (1) Knowledge generation, (2) building technical and institutional capacities, and (3) the institutionalization of risk management. As a result, both the authorities and the population have improved their resilience to respond to the occurrence of GLOF.”

Explore more related chapters here.

Evolution of the Lake 513 from 1962 to 2002 due to glacial retreat. Diagrams performed over aerial photographs from the National Aerial Photography Service Peru (left) and Google Earth (right) (Source: Randy Muñoz)
Evolution of the Lake 513 from 1962 to 2002 due to glacial retreat (Source: The Climate Change Adaptation Strategies).
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Pre-industrial Anthropocene Detected in Peru

Humans may have begun to pollute the atmosphere earlier than we thought. So says recent research conducted at the Quelccaya Ice Cap in Peru, where scientists drilled into the ice to pull out cores, which they could read like ancient texts.

QuelccayaThose cores show widespread traces of copper and lead starting in about A.D. 1540, which corresponds to the end of the Inca empire and a period of mining and metallurgy when the areas that are now Peru and Bolivia became part of the Spanish Empire. The findings, published by Paolo Gabrielli and colleagues in February in the Proceedings of the National Academy of Sciences, suggest for the first time that the Anthropocene, the geological epoch defined by massive and widespread human impacts on the planet, began about 240 years before the industrial age arrived on the scene with its steam engines and its coal plants.

Scientists have long used glacier ice cores to learn about the Earth’s climates and air pollution and reconstruct pollution histories. In Greenland, for example, they have traced metals found in ice cores back to ancient Greek and Roman mining operations. The pattern of climate changes and air quality are recorded in the ice itself as glaciers grow, accumulating layer after layer of ice, year after year. For example, winter layers are often thicker and lighter in color, while summer layers are often thinner and darker because of less snowfall and more dust in summer. Scientists can read these layers much in the same way they read tree rings to calculate historical environmental conditions, including snowfall and atmospheric composition.

Layers in Quelccaya ice cap (Source: Emporia State)
Layers in Quelccaya ice cap (Source: Emporia State)

Once the scientists have removed the ice cores from a glacier, they can analyze the trace elements in the ice itself. They also study the air bubbles trapped in those cores at the time of their formation to learn about the chemical components of the atmosphere. According to Paolo Gabrielli, an Earth scientist at Ohio State University, anything in the air at the time the glacier layer was formed, such as soot particles, dust and a wide variety of chemicals, will be trapped in the ice layers as well. Gabrielli says there are no glaciers on Earth in which traces of anthropogenic air pollution cannot be detected.

Gabrielli and his team found that lead levels in the Quelccaya ice core doubled between 1450 and 1900, while the amount of chemical element antimony (Sb) in the ice was 3.5 times greater than  before. They also compared data from a peat bog in Tierra del Fuego, Chile, and from sedimentary lake records from regions including Potosí and other mines throughout Bolivia and Peru to determine the path the pollution took, and found that most of the pollution was carried to the Quelccaya Ice Cap in Peru by the wind.

In the 16th century, the Spanish colonial authorities forced the indigenous populations in South America to extract ore and refine silver from the mountaintop mines of Potosi. They introduced mercury amalgamation, a new technology, to expand silver production, which lead to dramatic increases in the amounts of trace metals released into the atmosphere.

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Silver Mining in South America Source: La Salle University

“This evidence supports the idea that human impact on the environment was widespread even before the industrial revolution,” Gabrielli said in a statement on Ohio State University’s website.

While the industrial economies in 20th century produced more pollution than any other time in human history, colonial mining should be considered the beginning of the Anthropocene, according to these new findings.

For more information about Quelccaya, look here.

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