Chemical characteristics of size-resolved aerosols from Asian dust and haze episode in Seoul Metropolitan City

Eunha Kang, Jihyun Han, Meehye Lee, Gangwoong Lee, Jong Chun Kim

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

We collected aerosol particles in Seoul using a 10 stage Micro-Orifice Uniform Deposit Impactor (MOUDI) to investigate the size distributions of aerosol mass and water-soluble inorganic ions (Na+, NH4 +, K+, Mg2+, Ca2+, Cl-, NO3 -, and SO4 2-) for the two high-mass episodes taking place in February and April, 2009. The former was a heavy Asian dust (AD) event and the latter was a haze episode associated with stagnant condition that prevailed over the Yellow Sea region. In AD plume, the mass peak was noticeable at coarse mode between 1.0 and 1.8μm but SO4 2- and NH4 + were enriched in condensation mode between 0.056 and 0.1μm. There was little chance for the heavy AD plume to pick up SO2 and water vapor, which are in good accordance with its transport paths and the chemical characteristics of aerosols and gaseous species. These results imply that the heterogeneous reaction of SO2 on dust particles would not be substantial in determining sulfate concentrations for this particular type of dust plume, considering the possibility of loss of large soil particles in MOUDI. During the haze episode, both total aerosol mass and water-soluble inorganic ions showed bimodal size distributions with the droplet (0.32-0.56μm) and coarse (1.0-1.8μm) mode peaks. In this haze event, acidic gases tend to be dissolved more efficiently in larger particles, shifting the peaks of SO4 2- and NO3 - to larger droplet particles. For NH4 +, however, the mode change was not observed, which was probably due to the depleted source and high solubility of NH3. These results demonstrated that the availability of precursor gases such as SO2, NO2, and NH3, and the water-vapor contents were important factor to determine the formation of droplet-mode particles and their sizes.

Original languageEnglish
Pages (from-to)34-46
Number of pages13
JournalAtmospheric Research
Volume127
DOIs
Publication statusPublished - 2013 Jun 1

Fingerprint

haze
particle size
dust
aerosol
droplet
plume
water vapor
ion
gas
condensation
solubility
city
particle
chemical
sulfate
water
soil
impactor

Keywords

  • Asian dust
  • Haze
  • MOUDI
  • Size-resolved aerosol
  • Water-soluble inorganic ions

ASJC Scopus subject areas

  • Atmospheric Science

Cite this

Chemical characteristics of size-resolved aerosols from Asian dust and haze episode in Seoul Metropolitan City. / Kang, Eunha; Han, Jihyun; Lee, Meehye; Lee, Gangwoong; Kim, Jong Chun.

In: Atmospheric Research, Vol. 127, 01.06.2013, p. 34-46.

Research output: Contribution to journalArticle

Kang, Eunha ; Han, Jihyun ; Lee, Meehye ; Lee, Gangwoong ; Kim, Jong Chun. / Chemical characteristics of size-resolved aerosols from Asian dust and haze episode in Seoul Metropolitan City. In: Atmospheric Research. 2013 ; Vol. 127. pp. 34-46.
@article{f7ab4a545bf7482e83614ceaee453fd9,
title = "Chemical characteristics of size-resolved aerosols from Asian dust and haze episode in Seoul Metropolitan City",
abstract = "We collected aerosol particles in Seoul using a 10 stage Micro-Orifice Uniform Deposit Impactor (MOUDI) to investigate the size distributions of aerosol mass and water-soluble inorganic ions (Na+, NH4 +, K+, Mg2+, Ca2+, Cl-, NO3 -, and SO4 2-) for the two high-mass episodes taking place in February and April, 2009. The former was a heavy Asian dust (AD) event and the latter was a haze episode associated with stagnant condition that prevailed over the Yellow Sea region. In AD plume, the mass peak was noticeable at coarse mode between 1.0 and 1.8μm but SO4 2- and NH4 + were enriched in condensation mode between 0.056 and 0.1μm. There was little chance for the heavy AD plume to pick up SO2 and water vapor, which are in good accordance with its transport paths and the chemical characteristics of aerosols and gaseous species. These results imply that the heterogeneous reaction of SO2 on dust particles would not be substantial in determining sulfate concentrations for this particular type of dust plume, considering the possibility of loss of large soil particles in MOUDI. During the haze episode, both total aerosol mass and water-soluble inorganic ions showed bimodal size distributions with the droplet (0.32-0.56μm) and coarse (1.0-1.8μm) mode peaks. In this haze event, acidic gases tend to be dissolved more efficiently in larger particles, shifting the peaks of SO4 2- and NO3 - to larger droplet particles. For NH4 +, however, the mode change was not observed, which was probably due to the depleted source and high solubility of NH3. These results demonstrated that the availability of precursor gases such as SO2, NO2, and NH3, and the water-vapor contents were important factor to determine the formation of droplet-mode particles and their sizes.",
keywords = "Asian dust, Haze, MOUDI, Size-resolved aerosol, Water-soluble inorganic ions",
author = "Eunha Kang and Jihyun Han and Meehye Lee and Gangwoong Lee and Kim, {Jong Chun}",
year = "2013",
month = "6",
day = "1",
doi = "10.1016/j.atmosres.2013.02.002",
language = "English",
volume = "127",
pages = "34--46",
journal = "Atmospheric Research",
issn = "0169-8095",
publisher = "Elsevier BV",

}

TY - JOUR

T1 - Chemical characteristics of size-resolved aerosols from Asian dust and haze episode in Seoul Metropolitan City

AU - Kang, Eunha

AU - Han, Jihyun

AU - Lee, Meehye

AU - Lee, Gangwoong

AU - Kim, Jong Chun

PY - 2013/6/1

Y1 - 2013/6/1

N2 - We collected aerosol particles in Seoul using a 10 stage Micro-Orifice Uniform Deposit Impactor (MOUDI) to investigate the size distributions of aerosol mass and water-soluble inorganic ions (Na+, NH4 +, K+, Mg2+, Ca2+, Cl-, NO3 -, and SO4 2-) for the two high-mass episodes taking place in February and April, 2009. The former was a heavy Asian dust (AD) event and the latter was a haze episode associated with stagnant condition that prevailed over the Yellow Sea region. In AD plume, the mass peak was noticeable at coarse mode between 1.0 and 1.8μm but SO4 2- and NH4 + were enriched in condensation mode between 0.056 and 0.1μm. There was little chance for the heavy AD plume to pick up SO2 and water vapor, which are in good accordance with its transport paths and the chemical characteristics of aerosols and gaseous species. These results imply that the heterogeneous reaction of SO2 on dust particles would not be substantial in determining sulfate concentrations for this particular type of dust plume, considering the possibility of loss of large soil particles in MOUDI. During the haze episode, both total aerosol mass and water-soluble inorganic ions showed bimodal size distributions with the droplet (0.32-0.56μm) and coarse (1.0-1.8μm) mode peaks. In this haze event, acidic gases tend to be dissolved more efficiently in larger particles, shifting the peaks of SO4 2- and NO3 - to larger droplet particles. For NH4 +, however, the mode change was not observed, which was probably due to the depleted source and high solubility of NH3. These results demonstrated that the availability of precursor gases such as SO2, NO2, and NH3, and the water-vapor contents were important factor to determine the formation of droplet-mode particles and their sizes.

AB - We collected aerosol particles in Seoul using a 10 stage Micro-Orifice Uniform Deposit Impactor (MOUDI) to investigate the size distributions of aerosol mass and water-soluble inorganic ions (Na+, NH4 +, K+, Mg2+, Ca2+, Cl-, NO3 -, and SO4 2-) for the two high-mass episodes taking place in February and April, 2009. The former was a heavy Asian dust (AD) event and the latter was a haze episode associated with stagnant condition that prevailed over the Yellow Sea region. In AD plume, the mass peak was noticeable at coarse mode between 1.0 and 1.8μm but SO4 2- and NH4 + were enriched in condensation mode between 0.056 and 0.1μm. There was little chance for the heavy AD plume to pick up SO2 and water vapor, which are in good accordance with its transport paths and the chemical characteristics of aerosols and gaseous species. These results imply that the heterogeneous reaction of SO2 on dust particles would not be substantial in determining sulfate concentrations for this particular type of dust plume, considering the possibility of loss of large soil particles in MOUDI. During the haze episode, both total aerosol mass and water-soluble inorganic ions showed bimodal size distributions with the droplet (0.32-0.56μm) and coarse (1.0-1.8μm) mode peaks. In this haze event, acidic gases tend to be dissolved more efficiently in larger particles, shifting the peaks of SO4 2- and NO3 - to larger droplet particles. For NH4 +, however, the mode change was not observed, which was probably due to the depleted source and high solubility of NH3. These results demonstrated that the availability of precursor gases such as SO2, NO2, and NH3, and the water-vapor contents were important factor to determine the formation of droplet-mode particles and their sizes.

KW - Asian dust

KW - Haze

KW - MOUDI

KW - Size-resolved aerosol

KW - Water-soluble inorganic ions

UR - http://www.scopus.com/inward/record.url?scp=84875493293&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84875493293&partnerID=8YFLogxK

U2 - 10.1016/j.atmosres.2013.02.002

DO - 10.1016/j.atmosres.2013.02.002

M3 - Article

AN - SCOPUS:84875493293

VL - 127

SP - 34

EP - 46

JO - Atmospheric Research

JF - Atmospheric Research

SN - 0169-8095

ER -