TY - JOUR
T1 - The impact of relative humidity on the size distribution and chemical processes of major water-soluble inorganic ions in the megacity of Chongqing, China
AU - Wang, Lu
AU - Ji, Dongsheng
AU - Li, Yi
AU - Gao, Meng
AU - Tian, Shili
AU - Wen, Tianxue
AU - Liu, Zirui
AU - Wang, Lili
AU - Xu, Peng
AU - Jiang, Changsheng
AU - Wang, Yuesi
PY - 2017/8/1
Y1 - 2017/8/1
N2 - To investigate the impacts of relative humidity (RH) on the size distribution and evolution of water-soluble inorganic ions (WSIIs) in Chongqing, China, size-resolved aerosols were collected using nine-stage viable Andersen cascade impactors bi-weekly from June 2012 to May 2014. The WSIIs (SO42−, NO3−, NH4+, K+, Na+, Cl−, Ca2+, Mg2+ and F−) were analyzed. The SO42−, NO3− and NH4+ peaks shifted from 0.43–0.65μm particles at 40–60% RH to 0.65–1.1μm particles at 70–90% RH. For K+, Na+ and Cl−, the peak concentrations were in the size range of 0.65–2.1μm and increased as the RH increased from 40 to 90%. However, the Ca2+, Mg2+ and F− peaks at all RH levels were mainly concentrated in the coarse mode, and their concentrations did not increase as regularly as those of SO42−, NO3− and NH4+. All of the results suggest that RH was likely an important factor in determining the size distributions of the WSIIs. SO42−, NO3− and NH4+ increased linearly in all size ranges as a function of RH (40–90%). Additionally, SO42− presented the highest rate of mass increase at 1.8μg/m3/10% RH in 1.1
AB - To investigate the impacts of relative humidity (RH) on the size distribution and evolution of water-soluble inorganic ions (WSIIs) in Chongqing, China, size-resolved aerosols were collected using nine-stage viable Andersen cascade impactors bi-weekly from June 2012 to May 2014. The WSIIs (SO42−, NO3−, NH4+, K+, Na+, Cl−, Ca2+, Mg2+ and F−) were analyzed. The SO42−, NO3− and NH4+ peaks shifted from 0.43–0.65μm particles at 40–60% RH to 0.65–1.1μm particles at 70–90% RH. For K+, Na+ and Cl−, the peak concentrations were in the size range of 0.65–2.1μm and increased as the RH increased from 40 to 90%. However, the Ca2+, Mg2+ and F− peaks at all RH levels were mainly concentrated in the coarse mode, and their concentrations did not increase as regularly as those of SO42−, NO3− and NH4+. All of the results suggest that RH was likely an important factor in determining the size distributions of the WSIIs. SO42−, NO3− and NH4+ increased linearly in all size ranges as a function of RH (40–90%). Additionally, SO42− presented the highest rate of mass increase at 1.8μg/m3/10% RH in 1.1
KW - Relative humidity
KW - Size distribution
KW - Water-soluble inorganic ions
KW - Chemical processes
KW - Chongqing
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-85016403290&partnerID=MN8TOARS
U2 - 10.1016/j.atmosres.2017.03.016
DO - 10.1016/j.atmosres.2017.03.016
M3 - Journal article
SN - 0169-8095
VL - 192
SP - 19
EP - 29
JO - Atmospheric Research
JF - Atmospheric Research
ER -