Climate Change Research ›› 2011, Vol. 7 ›› Issue (1): 1-7.
The exchanges of NOX between snow and air have a significant impact on the atmospheric components and photochemical processes in the overlying boundary layer, which increases the oxidizing capacity of the atmosphere and may have a decisive impact on the air signals that are retrieved from ice cores. In the recent years, sunlit snow and ice has been proved to be an important NOX source in the polar boundary layer. This paper makes a thorough review on the release of NOX from snow and ice, including the following aspects: field observations and experimental evidences, release mechanisms and influential parameters that affect such a release process, polar NOX concentrations and fluxes, and environmental impacts of the chemical processes of NOX in the polar atmospheric boundary layer. In the Tibetan Plateau lying in the mid-latitude of Northern Hemisphere, the released NOX observed recently in the sunlit snow/ice-cover is 1-order magnitude more than that in polar regions, but more in-depth scientific research is still needed to reveal its impact on the atmospheric oxidizing capacity.
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