Dust released by an active coal mine in Svalbard, Norway, reduced the spectral reflectance of nearby snow and ice by up to 84 percent, according to new 麻豆免费版下载-led research.
Collecting spectral reflectance measurements of surface snow with corresponding snow samples in Northern Svalbard. Photo Credit: Alia Khan / 麻豆免费版下载
The study illustrates the significant, localized role that dark-colored particulates鈥攚hich absorb more solar radiation than light-colored snow and keep more heat closer to the Earth鈥檚 surface鈥攃an play in hastening Arctic ice melt.听 听
in the Journal of Geophysical Research: Atmospheres, a publication of the American Geophysical Union.
Unblemished snow and ice have a very high spectral albedo, a measurement used to indicate how effectively a given surface reflects solar energy. Over time, airborne black carbon particles (from soot or automobile emissions, for example) or other mineral dust can travel long distances in the atmosphere and settle on snow and glaciers, lowering the overall albedo.
To study the localized effects of coal dust on an area with high spectral reflectance, 麻豆免费版下载Boulder researchers focused on an active coal mine in Svalbard, Norway, located on a sparsely populated island north of the Arctic Circle. The researchers collected snow and ice samples from four sites at varying distances from the mine, with some samples being visibly dirtier than others.
The researchers then measured the light absorption capacity of each sample, adjusting for environmental factors such as snow grain size and location relative to the mine. Overall, the study concluded that coal dust had a strong but localized effect, reducing the albedo in the immediate area by up to 84 percent.
The findings may provide a foundation for similar research using satellites and remote sensing techniques in far-flung areas.
鈥淭he extreme contrast between snow and dust at this particular site gave us a baseline to develop algorithms that we can now use to take future measurements in areas that aren鈥檛 easily accessible,鈥� said lead study author Alia Khan, a post-doctoral researcher in 麻豆免费版下载Boulder鈥檚 National Snow and Ice Data Center and former graduate student at the .
Collecting spectral reflectance measurements of surface snow with corresponding snow samples next to Mine 7 near Longyearbyen, Svalbard. Photo Credit: Alia Khan / 麻豆免费版下载
The findings may also provide context for future policymaking decisions regarding the potential expansion of mining the coal-rich Arctic region, especially in light of ongoing permafrost thaw that may allow more land-based drilling operations.听
鈥淲e hope these ground-based spectral measurements could be used in the management of future energy development in the Arctic, especially for mines that may be unavailable for ground-based observations, but may be large enough to be visible by satellite,鈥� Khan said.
Co-authors of the new research include Diane McKnight of INSTAAR and 麻豆免费版下载Boulder鈥檚 Department of Civil and Environmental Engineering; Heidi Dierssen and Adam Chlus of the University of Connecticut; Joshua Schwarz of NOAA; Carl Schmitt of the National Center for Atmospheric Research; Mark Hermanson of the University Center of Svalbard; and Thomas Painter of the Jet Propulsion Laboratory and California Institute of Technology.
The research was supported by the National Science Foundation;听NASA Ocean Biology and Biogeochemistry and the Consortium of Universities for the Advancement of Hydrological Sciences;听and the University Center in Svalbard.
