Decoupling peroxyacetyl nitrate from ozone in Chinese outflows observed at Gosan Climate Observatory

Jihyun Han, Meehye Lee, Xiaona Shang, Gangwoong Lee, Louisa K Emmons

Research output: Contribution to journalArticle

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Abstract

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.

Original languageEnglish
Pages (from-to)10619-10631
Number of pages13
JournalAtmospheric Chemistry and Physics
Volume17
Issue number17
DOIs
Publication statusPublished - 2017 Sep 8

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peroxyacetyl nitrate
outflow
observatory
ozone
climate
organic carbon
carbon
haze
mixing ratio
air mass
gas chromatography
air quality
combustion
perturbation
aerosol

ASJC Scopus subject areas

  • Atmospheric Science

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Decoupling peroxyacetyl nitrate from ozone in Chinese outflows observed at Gosan Climate Observatory. / Han, Jihyun; Lee, Meehye; Shang, Xiaona; Lee, Gangwoong; K Emmons, Louisa.

In: Atmospheric Chemistry and Physics, Vol. 17, No. 17, 08.09.2017, p. 10619-10631.

Research output: Contribution to journalArticle

Han, Jihyun ; Lee, Meehye ; Shang, Xiaona ; Lee, Gangwoong ; K Emmons, Louisa. / Decoupling peroxyacetyl nitrate from ozone in Chinese outflows observed at Gosan Climate Observatory. In: Atmospheric Chemistry and Physics. 2017 ; Vol. 17, No. 17. pp. 10619-10631.
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abstract = "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, {\^I}3 Combining double low line ĝ€0.79) than with O3 ({\^I}3 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.",
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