Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 52, Issue 13, Pages 7203-7211Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.8b01251
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Funding
- National Natural Science Foundation of China [41522103, 41630754, 41625014]
- DST Inspire Faculty award [IFA-EAS-02]
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Humic-like substances (HULIS) are major components of light-absorbing brown carbon that play an important role in Earth's radiative balance. However, their concentration, optical properties, and sources are least understood over Tibetan Plateau (TP). In this study, the analysis of total suspended particulate (TSP) samples from central of TP (i.e., Nam Co) reveal that atmospheric HULIS are more abundant in summer than that in winter without obvious diurnal variations. The light absorption ability of HULIS in winter is 2-3 times higher than that in summer. In winter, HULIS are mainly derived from biomass burning emissions in South Asia by long-range transport. In contrast, the oxidation of anthropogenic and biogenic precursors from northeast part of India and southeast of TP are major sources of HULIS in summer.
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