High contribution of secondary brown carbon to aerosol light absorption in the southeastern margin of Tibetan Plateau
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High contribution of secondary brown carbon to aerosol light absorption in the southeastern margin of Tibetan Plateau
Professor Dr. Siwatt Pongpiachan (School of Social and Environmental Development, National Institute of Development Administration), Qiyuan Wang, Yongming Han, Jianhuai Ye, Suixin Liu, Ningning Zhang, Yuemei Han, Jie Tian, Cheng Wu, Xin Long, Qian Zhang, Wenyan Zhang, Zhuzi Zhao, Junji Cao
Abstract
The optical properties of atmospheric secondary brown carbon (BrC) aerosol are poorly understood because of its chemical complexity, and this has hampered quantitative assessments of the impacts of this light-absorbing material on glaciers on the Tibetan Plateau (TP). For this study, a statistical approach was developed to investigate BrC light absorption over the southeastern margin of the TP.
Secondary sources for BrC were more important for absorption than primary ones. A diurnal cycle in secondary BrC absorption was explained by the formation of light-absorbing chromophores by photochemical oxidation after sunrise followed by photobleaching of the chromophores under the more oxidizing conditions as the day progressed. Multi-method analyses showed that biomass burning in northern Burma and along the Sino-Burmese border was the most important source for the secondary BrC. The mean integrated simple forcing efficiency was 79 W g-1, indicating that secondary BrC can cause substantial radiative effects.
อ่านเพิ่มเติมได้ที่ : High contribution of secondary brown carbon to aerosol light absorption in the southeastern margin of Tibetan Plateau
