TY - JOUR
T1 - Decoupling peroxyacetyl nitrate from ozone in Chinese outflows observed at Gosan Climate Observatory
AU - Han, Jihyun
AU - Lee, Meehye
AU - Shang, Xiaona
AU - Lee, Gangwoong
AU - K Emmons, Louisa
N1 - Funding Information:
Acknowledgements. This study was funded by the Korea Meteorological Administration Research and Development Program under Grant KMIPA 2015-6020. The National Center for Atmospheric Research is funded by the National Science Foundation. The authors gratefully acknowledge the NOAA Air Resources Laboratory (ARL) for the provision of the HYSPLIT transport and dispersion model and the READY website (http://www.ready.noaa.gov) used in this publication.
Publisher Copyright:
©Author(s)2017.
PY - 2017/9/8
Y1 - 2017/9/8
N2 - We measured peroxyacetyl nitrate (PAN) and other reactive species such as O3, NO2, CO, and SO2 with aerosols including mass, organic carbon (OC), and elemental carbon (EC) in PM2. 5 and K+ in PM1. 0 at Gosan Climate Observatory in Korea (33.17°ĝ€N, 126.10°ĝ€E) during 19 October-6 November 2010. PAN was determined through fast gas chromatography with luminol chemiluminescence detection at 425ĝ€nm every 2ĝ€min. The PAN mixing ratios ranged from 0.1 (detection limit) to 2.4ĝ€ppbv with a mean of 0.6ĝ€ppbv. For all measurements, PAN was unusually better correlated with PM2. 5 (Pearson correlation coefficient, Î3 Combining double low line ĝ€0.79) than with O3 (Î3 Combining double low line ĝ€0.67). In particular, the O3 level was highly elevated with SO2 at midnight, along with a typical midday peak when air was transported rapidly from the Beijing areas. The PAN enhancement was most noticeable during the occurrence of haze under stagnant conditions. In Chinese outflows slowly transported over the Yellow Sea, PAN gradually increased up to 2.4ĝ€ppbv at night, in excellent correlation with a concentration increase in PM2. 5 OC and EC, PM2. 5 mass, and PM1. 0 K+. The high K+ concentration and OCĝ€ĝ•ĝ€EC ratio indicated that the air mass was impacted by biomass combustion. This study highlights PAN decoupling with O3 in Chinese outflows and suggests PAN as a useful indicator for diagnosing continental outflows and assessing their perturbation of regional air quality in northeast Asia.
AB - We measured peroxyacetyl nitrate (PAN) and other reactive species such as O3, NO2, CO, and SO2 with aerosols including mass, organic carbon (OC), and elemental carbon (EC) in PM2. 5 and K+ in PM1. 0 at Gosan Climate Observatory in Korea (33.17°ĝ€N, 126.10°ĝ€E) during 19 October-6 November 2010. PAN was determined through fast gas chromatography with luminol chemiluminescence detection at 425ĝ€nm every 2ĝ€min. The PAN mixing ratios ranged from 0.1 (detection limit) to 2.4ĝ€ppbv with a mean of 0.6ĝ€ppbv. For all measurements, PAN was unusually better correlated with PM2. 5 (Pearson correlation coefficient, Î3 Combining double low line ĝ€0.79) than with O3 (Î3 Combining double low line ĝ€0.67). In particular, the O3 level was highly elevated with SO2 at midnight, along with a typical midday peak when air was transported rapidly from the Beijing areas. The PAN enhancement was most noticeable during the occurrence of haze under stagnant conditions. In Chinese outflows slowly transported over the Yellow Sea, PAN gradually increased up to 2.4ĝ€ppbv at night, in excellent correlation with a concentration increase in PM2. 5 OC and EC, PM2. 5 mass, and PM1. 0 K+. The high K+ concentration and OCĝ€ĝ•ĝ€EC ratio indicated that the air mass was impacted by biomass combustion. This study highlights PAN decoupling with O3 in Chinese outflows and suggests PAN as a useful indicator for diagnosing continental outflows and assessing their perturbation of regional air quality in northeast Asia.
UR - http://www.scopus.com/inward/record.url?scp=85029157200&partnerID=8YFLogxK
U2 - 10.5194/acp-17-10619-2017
DO - 10.5194/acp-17-10619-2017
M3 - Article
AN - SCOPUS:85029157200
VL - 17
SP - 10619
EP - 10631
JO - Atmospheric Chemistry and Physics
JF - Atmospheric Chemistry and Physics
SN - 1680-7316
IS - 17
ER -
