期刊
INDOOR AIR
卷 32, 期 1, 页码 -出版社
WILEY
DOI: 10.1111/ina.12966
关键词
HONO photolysis; indoor actinic flux; light distribution; oxidant and radical chemistry; photon flux; window transmission
类别
资金
- Alfred P. Sloan Foundation [G-2018-11062, G-2017-9944]
Intensive measurements of wavelength-resolved spectral irradiance in a test house during the HOMEChem campaign revealed clear diurnal cycles and large variations in local gas-phase photochemical activity. Sunlight entering through windows was found to be the dominant source of UV light, leading to increased photolysis rate constants and spatially heterogeneous reactions. Opening windows increased UV photon fluxes and predicted local hydroxyl radical concentrations in sunlit regions were significantly higher.
We made intensive measurements of wavelength-resolved spectral irradiance in a test house during the HOMEChem campaign and report diurnal profiles and two-dimensional spatial distribution of photolysis rate constants (J) of several important indoor photolabile gases. Results show that sunlight entering through windows, which was the dominant source of ultraviolet (UV) light in this house, led to clear diurnal cycles, and large time- and location-dependent variations in local gas-phase photochemical activity. Local J values of several key indoor gases under direct solar illumination were 1.8-7.4 times larger-and more strongly dependent on time, solar zenith angle, and incident angle of sunlight relative to the window-than under diffuse sunlight. Photolysis rate constants were highly spatially heterogeneous and fast photochemical reactions in the gas phase were generally confined to within tens of cm of the region that were directly sunlit. Opening windows increased UV photon fluxes by 3 times and increased predicted local hydroxyl radical (OH) concentrations in the sunlit region by 4.5 times to 3.2 x 10(7) molec cm(-3) due to higher J values and increased contribution from O-3 photolysis. These results can be used to improve the treatment of photochemistry in indoor chemistry models and are a valuable resource for future studies that use the publicly available HOMEChem measurements.
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