TY - JOUR
T1 - Heterogeneous uptake of N2O5 in sand dust and urban aerosols observed during the dry season in Beijing
AU - Xia, Men
AU - Wang, Weihao
AU - Wang, Zhe
AU - Gao, Jian
AU - Li, Hong
AU - Liang, Yutong
AU - Yu, Chuan
AU - Zhang, Yuechong
AU - Wang, Peng
AU - Zhang, Yujie
AU - Bi, Fang
AU - Cheng, Xi
AU - Wang, Tao
PY - 2019/1/1
Y1 - 2019/1/1
N2 - The uptake of dinitrogen pentoxide (N2O5) on aerosols affects the nocturnal removal of NOx and particulate nitrate formation in the atmosphere. This study investigates N2O5 uptake processes using field observations from an urban site in Beijing during April-May 2017, a period characterized by dry weather conditions. For the first time, a very large N2O5 uptake rate (k(N2O5) up to ~0.01 s-1) was observed during a sand storm event, and the uptake coefficient ( (N2O5)) was estimated to be 0.044. The γ(N2O5) in urban air masses was also determined and exhibited moderate correlation (r = 0.68) with aerosol volume to surface ratio (Va/Sa), but little relation to aerosol water, nitrate, and chloride, a finding that contrasts with previous results. Several commonly used parameterizations of γ(N2O5) underestimated the field-derived γ(N2O5). A new parameterization is suggested for dry conditions, which considers the effect of Va/Sa, temperature, and relative humidity.
AB - The uptake of dinitrogen pentoxide (N2O5) on aerosols affects the nocturnal removal of NOx and particulate nitrate formation in the atmosphere. This study investigates N2O5 uptake processes using field observations from an urban site in Beijing during April-May 2017, a period characterized by dry weather conditions. For the first time, a very large N2O5 uptake rate (k(N2O5) up to ~0.01 s-1) was observed during a sand storm event, and the uptake coefficient ( (N2O5)) was estimated to be 0.044. The γ(N2O5) in urban air masses was also determined and exhibited moderate correlation (r = 0.68) with aerosol volume to surface ratio (Va/Sa), but little relation to aerosol water, nitrate, and chloride, a finding that contrasts with previous results. Several commonly used parameterizations of γ(N2O5) underestimated the field-derived γ(N2O5). A new parameterization is suggested for dry conditions, which considers the effect of Va/Sa, temperature, and relative humidity.
KW - Aerosol compositions
KW - NO uptake
KW - Particle size
KW - Sand dust
UR - http://www.scopus.com/inward/record.url?scp=85069818665&partnerID=8YFLogxK
U2 - 10.3390/ATMOS10040204
DO - 10.3390/ATMOS10040204
M3 - Journal article
AN - SCOPUS:85069818665
SN - 2073-4433
VL - 10
JO - ATMOSPHERE
JF - ATMOSPHERE
IS - 4
M1 - 204
ER -