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Brown carbon 'tarballs' detected in Himalayan atmosphere
by Staff Writers
Washington DC (SPX) Nov 05, 2020

Types of individual particles in this study. (a) Tarball, (b) Organic matter (OM) residue, (c) OM-coating, (d) S-rich, (e) Soot, (f) Mineral.

Some people refer to the Himalaya-Tibetan Plateau as the "third pole" because the region has the largest reserve of glacial snow and ice outside of the north and south poles. The glaciers, which are extremely sensitive to climate change and human influence, have been retreating over the past decade. Now, researchers reporting in ACS' Environmental Science and Technology Letters have detected light-absorbing "tarballs" in the Himalayan atmosphere, which could contribute to glacial melt.

Burning biomass or fossil fuels releases light-absorbing, carbonaceous particles that can deposit on snow and ice, possibly hastening the melting of glaciers. Previous research has shown that one type of particle, called black carbon, can be transported long distances by wind to the Himalayan atmosphere.

But much less is known about the presence of brown carbon, a particle that can form tarballs - small, viscous spheres consisting of carbon, oxygen and small amounts of nitrogen, sulfur and potassium. Weijun Li and colleagues wanted to see what types of individual aerosol particles were present in air samples taken at a remote, high-altitude research station on the northern slope of the Himalayas.

Using electron microscopy, the researchers unexpectedly found that about 28% of the thousands of particles in the air samples from the Himalayan research station were tarballs, and the percentage increased on days with elevated levels of pollution.

Analyzing wind patterns and satellite data revealed that a dense array of active fire spots, corresponding to large-scale wheat-residue burning on the Indo-Gangetic Plain, occurred along the pathways of air masses that reached the Himalayan research station during sampling.

Through modeling calculations, the team estimated that tarballs deposited on glacial surfaces could contribute a significant warming effect. As a result, future climate models should consider the long-range transport of tarballs to the Himalayas, the researchers say.

Research paper


Related Links
American Chemical Society
Our Polluted World and Cleaning It Up


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U.S. one of world's top contributors to plastic pollution
Washington DC (UPI) Oct 30, 2020
The coastline of the United States is relatively clean compared to other parts of the world, but new research suggests the U.S. is one of the world's top contributors to coastal plastic pollution. The U.S. exports large amounts of plastic waste. Previous studies have ignored plastic scrap exports, offering the impression that the United States was effectively collecting, disposing and recycling its plastic waste, researchers have said. According to a new study, published Friday in the jo ... read more

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