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• W4249056931 abstract "Abstract. Nitrous acid (HONO) is a significant precursor of atmospheric detergent OH radicals, and plays a vital role in tropospheric chemistry. The current knowledge about the daytime HONO sources is incomplete, and its impact on the tropospheric radical chemistry has not been fully quantified. Existing observational studies of HONO were mostly conducted at surface, with few efforts focusing on the high-elevation atmospheres. In order to better understand the characteristics and sources of HONO in the upper boundary layer and lower free troposphere, two intensive field observations were carried out at the summit of Mt. Tai (1534 m a.s.l.), the peak of the North China Plain, in winter 2017 and spring 2018. HONO showed moderate concentration levels (0.15 ± 0.15 and 0.13 ± 0.15 ppbv), with maximum values of 1.14 and 3.23 ppbv in winter and spring, respectively. Diurnal variation patterns with a broad noontime maximum and lower nighttime concentrations were observed during both campaigns, which is distinct from most of the previous studies at the ground level. The WRF-FLEXPART simulations indicated the combined effects of the planetary boundary layer evolution and valley breeze on the daytime HONO peak. A photostationary state (PSS) analysis suggested the strong unknown daytime HONO source with production rates of 0.45 ± 0.25 ppb/h in winter and 0.64 ± 0.49 ppb/h in spring. Correlation analysis supported the important role of photo-enhanced heterogeneous conversion of NO2 to HONO on the aerosol surface at this high-elevation site. HONO photolysis is the predominant primary source of OH radical and plays a major role in the radical chemistry at Mt. Tai. The model only considering homogenous HONO source would largely underestimate the HOx radical levels and atmospheric oxidation capacity in the high-altitude atmosphere. This study shed light on the characteristics, sources, chemistry, and impacts of HONO in the upper boundary layer and lower free troposphere in the NCP region." @default.
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• W4249056931 date "2020-05-25" @default.
• W4249056931 modified "2023-10-14" @default.
• W4249056931 title "Sources of nitrous acid (HONO) in the upper boundary layer and lower free troposphere of North China Plain: insights from the Mount Tai Observatory" @default.
• W4249056931 doi "https://doi.org/10.5194/acp-2020-377" @default.
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