Formation of secondary inorganic aerosol (SIA) was investigated during a six-month long heating season in Harbin,China.Enhanced sulfate formation was observed at high relative humidity (RI),with the same threshold RH (80％) for both colder and warmer measurement periods.Compared to wintertime results from Beijing,the threshold RH was considerably higher in Harbin,whereas the RH-dependent enhancement of sulfur oxidation ratio (SOR) was less significant.In addition,the high RH events were rarely encountered,and for other periods,the SOR were typically as low as ～0.1.Therefore,the sulfate formation was considered inefficient in this study.After excluding the several cases with high RH,both SOR and the nitrogen oxidation ratio (NOR) exhibited increasing trends as the temperature increased,with the increase of NOR being sharper.The nitrate to sulfate ratio tended to increase with increasing temperature as well.Based on a semi-quantitative approach,this trend was attributed primarily to the temperature-dependent variations of precursors including SO2 and NO2.The influence of biomass burning emissions on SIA formation was also evident.With stronger impact of biomass burning,an enhancement in NOR was observed whereas SOR was largely unchanged.The different patterns were identified as the dominant driver of the larger nitrate to sulfate ratios measured at higher concentrations of fine particulate matter.

Yuan Cheng;Qinqin Yu;Jiumeng Liu;Youwen Sun;Linlin Liang;Zhenyu Du;Guannan Geng;Wanli Ma;Hong Qi;Qiang Zhang;Kebin He

State Key Laboratory of Urban Water Resource and Environment,School of Environment,Harbin Institute of Technology,Harbin 150090,China;Key Laboratory of Environmental Optics and Technology,Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Hefei 230031,China;State Key Laboratory of Severe Weather & CMA Key Laboratory of Atmospheric Chemistry,Chinese Academy of Meteorological Sciences,Beijing 100081,China;National Research Center for Environmental Analysis and Measurement,Environmental Development Center of the Ministry of Ecology and Environment,Beijing 100029,China;State Key Joint Laboratory of Environment Simulation and Pollution Control,School of Environment,Tsinghua University,Beijing 100084,China;Department of Earth System Science,Tsinghua University,Beijing 100084,China

环境科学与工程前沿

[1]Yuan Cheng;Qinqin Yu;Jiumeng Liu;Youwen Sun;Linlin Liang;Zhenyu Du;Guannan Geng;Wanli Ma;Hong Qi;Qiang Zhang;Kebin He-.Formation of secondary inorganic aerosol in a frigid urban atmosphere)[J].环境科学与工程前沿,2022(02):38-49

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