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Measurement report: Effects of anthropogenic emissions and environmental factors on the formation of biogenic secondary organic aerosol (BSOA) in a coastal city of southeastern China
Atmospheric Chemistry and Physics ( IF 5.2 ) Pub Date : 2022-06-16 , DOI: 10.5194/acp-22-7827-2022 Youwei Hong , Xinbei Xu , Dan Liao , Taotao Liu , Xiaoting Ji , Ke Xu , Chunyang Liao , Ting Wang , Chunshui Lin , Jinsheng Chen
Atmospheric Chemistry and Physics ( IF 5.2 ) Pub Date : 2022-06-16 , DOI: 10.5194/acp-22-7827-2022 Youwei Hong , Xinbei Xu , Dan Liao , Taotao Liu , Xiaoting Ji , Ke Xu , Chunyang Liao , Ting Wang , Chunshui Lin , Jinsheng Chen
To better understand the formation of biogenic secondary organic aerosol
(BSOA), aerosol samples with a 4 h time resolution were collected during
summer and winter in the southeast of China, along with online
measurements of trace gases, aerosol chemical compositions, and
meteorological parameters. The samples were analyzed by gas
chromatography–mass spectrometry for PM2.5-bound secondary organic aerosol (SOA) tracers, including
isoprene (SOAI), -pinene (SOAM), β-caryophyllene (SOAC), and toluene (ASOA). The average concentrations
of total SOA tracers in winter and summer were 38.8 and 111.9 ng m−3,
respectively, with the predominance of SOAM (70.1 % and 45.8 %),
followed by SOAI (14.0 % and 45.6 %), ASOA (11.0 % and 6.2 %)
and SOAC (4.9 % and 2.3 %). Compared to those in winter, the
majority of BSOA tracers in summer showed significant positive correlations
with Ox (O3+NO2) (r = 0.443–0.808), HONO (r = 0.299–0.601), ultraviolet (UV) (r = 0.382–0.588) and temperature (T) (r = 0.529–0.852), indicating the influence of photochemical oxidation under
relatively clean conditions. However, in winter, BSOA tracers were
significantly correlated with PM2.5 (r = 0.407–0.867),
NO (r = 0.416–0.884), SO (r = 0.419–0.813), and NH3 (r = 0.440–0.757), attributed to the
contributions of anthropogenic emissions. Major BSOA tracers in both seasons
were linearly correlated with aerosol acidity (pH) (r = 0.421–0.752),
liquid water content (LWC) (r = 0.403–0.876) and SO (r = 0.419–0.813). The results indicated that acid-catalyzed reactive uptake
onto sulfate aerosol particles enhanced the formation of BSOA. In summer,
the clean air mass originated from the ocean, and chlorine depletion was
observed. We also found that concentrations of the total SOA tracers were
correlated with HCl (R2=0.545) and chlorine ions (r = 0.280–0.639) in PM2.5, reflecting the contribution of Cl-initiated volatile organic compound (VOC) oxidations to the formation of SOA. In winter, the northeast dominant wind
direction brought continental polluted air mass to the monitoring site,
affecting the transformation of BSOA tracers. This implied that
anthropogenic emissions, atmospheric oxidation capacity and halogen
chemistry have significant effects on the formation of BSOA in the southeast
coastal area.
更新日期:2022-06-16