Approximated expression of the hygroscopic growth factor for polydispersed aerosols

Chang H. Jung; Young Jun Yoon; Junshik Um; Seoung Soo Lee; Kyung Man Han; Hye Jung Shin; Ji Yi Lee; Yong Pyo Kim

doi:10.1016/j.jaerosci.2020.105670

Approximated expression of the hygroscopic growth factor for polydispersed aerosols

Chang H. Jung, Young Jun Yoon, Junshik Um, Seoung Soo Lee, Kyung Man Han, Hye Jung Shin, Ji Yi Lee, Yong Pyo Kim

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

Hygroscopic growth of aerosols plays an important role in the characterization of atmospheric aerosols. Physico-chemical and optical properties of aerosols are dependent on relative humidity (RH) as well as on their size and composition. In this study, scattering enhancement factors, f(RH), for polydispersed aerosols were approximated. f(RH) of ammonium sulfate and ammonium nitrate (AS) and NaCl aerosols (ss) were considered under the assumption of externally mixed aerosols. f(RH) was calculated using the Mie theory for polydispersed aerosols at a given RH and corresponding water uptake (denoted as f_Mie(RH)). f(RH) was approximated as a quadratic function of RH (denoted as f_app(RH)). The obtained approximated f(RH) or f_app(RH)) values were compared with the values based on the Mie theory and showed a reasonable agreement between them. To the best of our knowledge, this is the first study that parametrizes the size dependency of f(RH) for log normally distributed aerosols.

Original language	English
Article number	105670
Journal	Journal of Aerosol Science
Volume	151
DOIs	https://doi.org/10.1016/j.jaerosci.2020.105670
State	Published - Jan 2021

Bibliographical note

Funding Information:
This research was supported by the Technology Development Program to Solve Climate Changes through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT ( 2019M1A2A2103953 ). This study was also supported by the KOPRI program ( PN20081 ), funded by a National Research Foundation of Korea Grant ( NRF-2016M1A5A1901786 ) and by the National Strategic Project – Fine particle of the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (MSIT) , the Ministry of Environment (ME) , and the Ministry of Health and Welfare ( MOHW ) ( NRF-2017M3D8A1092022 ). It was supported by Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Education ( 2020R1A6A1A03044834 ).

Publisher Copyright:
© 2020 The Authors

Keywords

Aerosol size distribution
Analytical approximated expression
Hygroscopic growth factor
Polydispersed aerosol
Scattering enhancement factor

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10.1016/j.jaerosci.2020.105670

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title = "Approximated expression of the hygroscopic growth factor for polydispersed aerosols",

abstract = "Hygroscopic growth of aerosols plays an important role in the characterization of atmospheric aerosols. Physico-chemical and optical properties of aerosols are dependent on relative humidity (RH) as well as on their size and composition. In this study, scattering enhancement factors, f(RH), for polydispersed aerosols were approximated. f(RH) of ammonium sulfate and ammonium nitrate (AS) and NaCl aerosols (ss) were considered under the assumption of externally mixed aerosols. f(RH) was calculated using the Mie theory for polydispersed aerosols at a given RH and corresponding water uptake (denoted as fMie(RH)). f(RH) was approximated as a quadratic function of RH (denoted as fapp(RH)). The obtained approximated f(RH) or fapp(RH)) values were compared with the values based on the Mie theory and showed a reasonable agreement between them. To the best of our knowledge, this is the first study that parametrizes the size dependency of f(RH) for log normally distributed aerosols.",

keywords = "Aerosol size distribution, Analytical approximated expression, Hygroscopic growth factor, Polydispersed aerosol, Scattering enhancement factor",

author = "Jung, {Chang H.} and Yoon, {Young Jun} and Junshik Um and Lee, {Seoung Soo} and Han, {Kyung Man} and Shin, {Hye Jung} and Lee, {Ji Yi} and Kim, {Yong Pyo}",

note = "Funding Information: This research was supported by the Technology Development Program to Solve Climate Changes through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT ( 2019M1A2A2103953 ). This study was also supported by the KOPRI program ( PN20081 ), funded by a National Research Foundation of Korea Grant ( NRF-2016M1A5A1901786 ) and by the National Strategic Project – Fine particle of the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (MSIT) , the Ministry of Environment (ME) , and the Ministry of Health and Welfare ( MOHW ) ( NRF-2017M3D8A1092022 ). It was supported by Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Education ( 2020R1A6A1A03044834 ). Publisher Copyright: {\textcopyright} 2020 The Authors",

year = "2021",

month = jan,

doi = "10.1016/j.jaerosci.2020.105670",

language = "English",

volume = "151",

journal = "Journal of Aerosol Science",

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AU - Jung, Chang H.

AU - Yoon, Young Jun

AU - Um, Junshik

AU - Lee, Seoung Soo

AU - Han, Kyung Man

AU - Shin, Hye Jung

AU - Lee, Ji Yi

AU - Kim, Yong Pyo

N1 - Funding Information: This research was supported by the Technology Development Program to Solve Climate Changes through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT ( 2019M1A2A2103953 ). This study was also supported by the KOPRI program ( PN20081 ), funded by a National Research Foundation of Korea Grant ( NRF-2016M1A5A1901786 ) and by the National Strategic Project – Fine particle of the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (MSIT) , the Ministry of Environment (ME) , and the Ministry of Health and Welfare ( MOHW ) ( NRF-2017M3D8A1092022 ). It was supported by Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Education ( 2020R1A6A1A03044834 ). Publisher Copyright: © 2020 The Authors

PY - 2021/1

Y1 - 2021/1

N2 - Hygroscopic growth of aerosols plays an important role in the characterization of atmospheric aerosols. Physico-chemical and optical properties of aerosols are dependent on relative humidity (RH) as well as on their size and composition. In this study, scattering enhancement factors, f(RH), for polydispersed aerosols were approximated. f(RH) of ammonium sulfate and ammonium nitrate (AS) and NaCl aerosols (ss) were considered under the assumption of externally mixed aerosols. f(RH) was calculated using the Mie theory for polydispersed aerosols at a given RH and corresponding water uptake (denoted as fMie(RH)). f(RH) was approximated as a quadratic function of RH (denoted as fapp(RH)). The obtained approximated f(RH) or fapp(RH)) values were compared with the values based on the Mie theory and showed a reasonable agreement between them. To the best of our knowledge, this is the first study that parametrizes the size dependency of f(RH) for log normally distributed aerosols.

AB - Hygroscopic growth of aerosols plays an important role in the characterization of atmospheric aerosols. Physico-chemical and optical properties of aerosols are dependent on relative humidity (RH) as well as on their size and composition. In this study, scattering enhancement factors, f(RH), for polydispersed aerosols were approximated. f(RH) of ammonium sulfate and ammonium nitrate (AS) and NaCl aerosols (ss) were considered under the assumption of externally mixed aerosols. f(RH) was calculated using the Mie theory for polydispersed aerosols at a given RH and corresponding water uptake (denoted as fMie(RH)). f(RH) was approximated as a quadratic function of RH (denoted as fapp(RH)). The obtained approximated f(RH) or fapp(RH)) values were compared with the values based on the Mie theory and showed a reasonable agreement between them. To the best of our knowledge, this is the first study that parametrizes the size dependency of f(RH) for log normally distributed aerosols.

KW - Aerosol size distribution

KW - Analytical approximated expression

KW - Hygroscopic growth factor

KW - Polydispersed aerosol

KW - Scattering enhancement factor

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DO - 10.1016/j.jaerosci.2020.105670

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SN - 0021-8502

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JO - Journal of Aerosol Science

JF - Journal of Aerosol Science

M1 - 105670

ER -

Approximated expression of the hygroscopic growth factor for polydispersed aerosols

Abstract

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Keywords

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