TY - JOUR
T1 - Size distribution and depolarization properties of aerosol particles over the northwest pacific and arctic ocean from shipborne measurements during an R/V xuelong cruise
AU - Tian, Yu
AU - Pan, Xiaole
AU - Yan, Jinpei
AU - Lin, Qi
AU - Sun, Yele
AU - Li, Mei
AU - Xie, Conghui
AU - Uno, Itsushi
AU - Liu, Hang
AU - Wang, Zhe
AU - Fu, Pingqing
AU - Wang, Zifa
PY - 2019/7/16
Y1 - 2019/7/16
N2 - Atmospheric aerosols over polar regions have attracted considerable attention for their pivotal effects on climate change. In this study, temporospatial variations in single-particle-based depolarization ratios (?: s-polarized component divided by the total backward scattering intensity) were studied over the Northwest Pacific and the Arctic Ocean using an optical particle counter with a depolarization module. The δvalue of aerosols was 0.06 ± 0.01 for the entire observation period, 61 ± 10% lower than the observations for coastal Japan (0.12 ± 0.02) (Pan et al. Atmos. Chem. Phys. 2016, 16, 9863-9873) and inland China (0.19 ± 0.02) (Tian et al. Atmos. Chem. Phys. 2018, 18, 18203-18217) in summer. The volume concentration showed two dominant size modes at 0.9 and 2 μm. The supermicrometer particles were mostly related to sea-salt aerosols with a δvalue of 0.09 over marine polar areas, ?22% larger than in the low-latitude region because of differences in chemical composition and dry air conditions. The δvalues for fine particles (<1 μm) were 0.05 ± 0.1, 50% lower than inland anthropogenic pollutants, mainly because of the complex mixtures of submicrometer sea salts. High particle concentrations in the Arctic Ocean could mostly be attributed to the strong marine emission of sea salt associated with deep oceanic cyclones, whereas long-range transport pollutants from the continent were among the primary causes of high particle concentrations in the Northwest Pacific region.
AB - Atmospheric aerosols over polar regions have attracted considerable attention for their pivotal effects on climate change. In this study, temporospatial variations in single-particle-based depolarization ratios (?: s-polarized component divided by the total backward scattering intensity) were studied over the Northwest Pacific and the Arctic Ocean using an optical particle counter with a depolarization module. The δvalue of aerosols was 0.06 ± 0.01 for the entire observation period, 61 ± 10% lower than the observations for coastal Japan (0.12 ± 0.02) (Pan et al. Atmos. Chem. Phys. 2016, 16, 9863-9873) and inland China (0.19 ± 0.02) (Tian et al. Atmos. Chem. Phys. 2018, 18, 18203-18217) in summer. The volume concentration showed two dominant size modes at 0.9 and 2 μm. The supermicrometer particles were mostly related to sea-salt aerosols with a δvalue of 0.09 over marine polar areas, ?22% larger than in the low-latitude region because of differences in chemical composition and dry air conditions. The δvalues for fine particles (<1 μm) were 0.05 ± 0.1, 50% lower than inland anthropogenic pollutants, mainly because of the complex mixtures of submicrometer sea salts. High particle concentrations in the Arctic Ocean could mostly be attributed to the strong marine emission of sea salt associated with deep oceanic cyclones, whereas long-range transport pollutants from the continent were among the primary causes of high particle concentrations in the Northwest Pacific region.
UR - http://www.scopus.com/inward/record.url?scp=85069949139&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85069949139&partnerID=8YFLogxK
U2 - 10.1021/acs.est.9b00245
DO - 10.1021/acs.est.9b00245
M3 - Article
C2 - 31257870
AN - SCOPUS:85069949139
VL - 53
SP - 7984
EP - 7995
JO - Environmental Science & Technology
JF - Environmental Science & Technology
SN - 0013-936X
IS - 14
ER -