Hygroscopic growth and CCN activity of HULIS from different environments

Thomas Bjerring Kristensen; Heike Wex; Bettina Nekat; Jacob Klenø Nøjgaard; Dominik van Pinxteren; Douglas H. Lowenthal; Lynn R. Mazzoleni; Katrin Dieckmann; Christian Bender Koch; Thomas F. Mentel; Hartmut Herrmann; A. Gannet Hallar; Frank Stratmann; Merete Bilde

doi:10.1029/2012JD018249

Hygroscopic growth and CCN activity of HULIS from different environments

Thomas Bjerring Kristensen, Heike Wex, Bettina Nekat, Jacob Klenø Nøjgaard, Dominik van Pinxteren, Douglas H. Lowenthal, Lynn R. Mazzoleni, Katrin Dieckmann, Christian Bender Koch, Thomas F. Mentel, Hartmut Herrmann, A. Gannet Hallar, Frank Stratmann, Merete Bilde

Department of Chemistry

27 Citations (Scopus)

Abstract

Humic-like substances (HULIS) constitute a significant fraction of aerosol particles in different environments. Studies of the role of HULIS in hygroscopic growth and cloud condensation nuclei (CCN) activity of aerosol particles are scarce, and results differ significantly. In this work the hygroscopic growth and CCN activity of water extracts (WE) and HULIS extracted from particulate matter (PM) collected at a polluted urban site (Copenhagen, Denmark), a rural site (Melpitz, Germany) and the remote site Storm Peak Laboratory (Colorado, USA) were investigated. Measurements of inorganic ions, elemental carbon, organic carbon and water soluble organic carbon (WSOC) within the PM confirmed that the sources of aerosol particles most likely differed for the three samples. The hygroscopic properties of the filtered WE were characterized by hygroscopicity parameters for subsaturated conditions (κ_GF) of 0.25, 0.41 and 0.22, and for supersaturated conditions κ_CCN were 0.23, 0.29 and 0.22 respectively for the urban, rural and remote WE samples. The measured hygroscopic growth and CCN activity were almost identical for the three HULIS samples and could be well represented by κ_GF = 0.07 and κ_CCN = 0.08-0.10 respectively. Small amounts of inorganic ions were present in the HULIS samples so the actual values for pure HULIS are expected to be slightly lower (κ _GF* = 0.04-0.06 and κ_CCN* = 0.07-0.08). The HULIS samples are thus less hygroscopic compared to most previous studies. To aid direct comparison of hygroscopic properties of HULIS from different studies, we recommend that the fraction of inorganic species in the HULIS samples always is measured and reported.

Original language	English
Article number	D22203
Journal	Journal of Geophysical Research: Earth Surface
Volume	117
Issue number	D22, 27
Number of pages	12
ISSN	2169-9003
DOIs	https://doi.org/10.1029/2012JD018249
Publication status	Published - 2012

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Kristensen, T. B., Wex, H., Nekat, B., Nøjgaard, J. K., Pinxteren, D. V., Lowenthal, D. H., Mazzoleni, L. R., Dieckmann, K., Bender Koch, C., Mentel, T. F., Herrmann, H., Hallar, A. G., Stratmann, F., & Bilde, M. (2012). Hygroscopic growth and CCN activity of HULIS from different environments. Journal of Geophysical Research: Earth Surface, 117(D22, 27), [D22203]. https://doi.org/10.1029/2012JD018249

Kristensen, TB, Wex, H, Nekat, B, Nøjgaard, JK, Pinxteren, DV, Lowenthal, DH, Mazzoleni, LR, Dieckmann, K, Bender Koch, C, Mentel, TF, Herrmann, H, Hallar, AG, Stratmann, F & Bilde, M 2012, 'Hygroscopic growth and CCN activity of HULIS from different environments', Journal of Geophysical Research: Earth Surface, vol. 117, no. D22, 27, D22203. https://doi.org/10.1029/2012JD018249

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title = "Hygroscopic growth and CCN activity of HULIS from different environments",

abstract = "Humic-like substances (HULIS) constitute a significant fraction of aerosol particles in different environments. Studies of the role of HULIS in hygroscopic growth and cloud condensation nuclei (CCN) activity of aerosol particles are scarce, and results differ significantly. In this work the hygroscopic growth and CCN activity of water extracts (WE) and HULIS extracted from particulate matter (PM) collected at a polluted urban site (Copenhagen, Denmark), a rural site (Melpitz, Germany) and the remote site Storm Peak Laboratory (Colorado, USA) were investigated. Measurements of inorganic ions, elemental carbon, organic carbon and water soluble organic carbon (WSOC) within the PM confirmed that the sources of aerosol particles most likely differed for the three samples. The hygroscopic properties of the filtered WE were characterized by hygroscopicity parameters for subsaturated conditions (κGF) of 0.25, 0.41 and 0.22, and for supersaturated conditions κCCN were 0.23, 0.29 and 0.22 respectively for the urban, rural and remote WE samples. The measured hygroscopic growth and CCN activity were almost identical for the three HULIS samples and could be well represented by κGF = 0.07 and κCCN = 0.08-0.10 respectively. Small amounts of inorganic ions were present in the HULIS samples so the actual values for pure HULIS are expected to be slightly lower (κ GF* = 0.04-0.06 and κCCN* = 0.07-0.08). The HULIS samples are thus less hygroscopic compared to most previous studies. To aid direct comparison of hygroscopic properties of HULIS from different studies, we recommend that the fraction of inorganic species in the HULIS samples always is measured and reported.",

author = "Kristensen, {Thomas Bjerring} and Heike Wex and Bettina Nekat and N{\o}jgaard, {Jacob Klen{\o}} and Pinxteren, {Dominik van} and Lowenthal, {Douglas H.} and Mazzoleni, {Lynn R.} and Katrin Dieckmann and {Bender Koch}, Christian and Mentel, {Thomas F.} and Hartmut Herrmann and Hallar, {A. Gannet} and Frank Stratmann and Merete Bilde",

year = "2012",

doi = "10.1029/2012JD018249",

language = "English",

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journal = "Journal of Geophysical Research",

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T1 - Hygroscopic growth and CCN activity of HULIS from different environments

AU - Kristensen, Thomas Bjerring

AU - Wex, Heike

AU - Nekat, Bettina

AU - Nøjgaard, Jacob Klenø

AU - Pinxteren, Dominik van

AU - Lowenthal, Douglas H.

AU - Mazzoleni, Lynn R.

AU - Dieckmann, Katrin

AU - Bender Koch, Christian

AU - Mentel, Thomas F.

AU - Herrmann, Hartmut

AU - Hallar, A. Gannet

AU - Stratmann, Frank

AU - Bilde, Merete

PY - 2012

Y1 - 2012

N2 - Humic-like substances (HULIS) constitute a significant fraction of aerosol particles in different environments. Studies of the role of HULIS in hygroscopic growth and cloud condensation nuclei (CCN) activity of aerosol particles are scarce, and results differ significantly. In this work the hygroscopic growth and CCN activity of water extracts (WE) and HULIS extracted from particulate matter (PM) collected at a polluted urban site (Copenhagen, Denmark), a rural site (Melpitz, Germany) and the remote site Storm Peak Laboratory (Colorado, USA) were investigated. Measurements of inorganic ions, elemental carbon, organic carbon and water soluble organic carbon (WSOC) within the PM confirmed that the sources of aerosol particles most likely differed for the three samples. The hygroscopic properties of the filtered WE were characterized by hygroscopicity parameters for subsaturated conditions (κGF) of 0.25, 0.41 and 0.22, and for supersaturated conditions κCCN were 0.23, 0.29 and 0.22 respectively for the urban, rural and remote WE samples. The measured hygroscopic growth and CCN activity were almost identical for the three HULIS samples and could be well represented by κGF = 0.07 and κCCN = 0.08-0.10 respectively. Small amounts of inorganic ions were present in the HULIS samples so the actual values for pure HULIS are expected to be slightly lower (κ GF* = 0.04-0.06 and κCCN* = 0.07-0.08). The HULIS samples are thus less hygroscopic compared to most previous studies. To aid direct comparison of hygroscopic properties of HULIS from different studies, we recommend that the fraction of inorganic species in the HULIS samples always is measured and reported.

AB - Humic-like substances (HULIS) constitute a significant fraction of aerosol particles in different environments. Studies of the role of HULIS in hygroscopic growth and cloud condensation nuclei (CCN) activity of aerosol particles are scarce, and results differ significantly. In this work the hygroscopic growth and CCN activity of water extracts (WE) and HULIS extracted from particulate matter (PM) collected at a polluted urban site (Copenhagen, Denmark), a rural site (Melpitz, Germany) and the remote site Storm Peak Laboratory (Colorado, USA) were investigated. Measurements of inorganic ions, elemental carbon, organic carbon and water soluble organic carbon (WSOC) within the PM confirmed that the sources of aerosol particles most likely differed for the three samples. The hygroscopic properties of the filtered WE were characterized by hygroscopicity parameters for subsaturated conditions (κGF) of 0.25, 0.41 and 0.22, and for supersaturated conditions κCCN were 0.23, 0.29 and 0.22 respectively for the urban, rural and remote WE samples. The measured hygroscopic growth and CCN activity were almost identical for the three HULIS samples and could be well represented by κGF = 0.07 and κCCN = 0.08-0.10 respectively. Small amounts of inorganic ions were present in the HULIS samples so the actual values for pure HULIS are expected to be slightly lower (κ GF* = 0.04-0.06 and κCCN* = 0.07-0.08). The HULIS samples are thus less hygroscopic compared to most previous studies. To aid direct comparison of hygroscopic properties of HULIS from different studies, we recommend that the fraction of inorganic species in the HULIS samples always is measured and reported.

U2 - 10.1029/2012JD018249

DO - 10.1029/2012JD018249

M3 - Journal article

SN - 0148-0227

VL - 117

JO - Journal of Geophysical Research

JF - Journal of Geophysical Research

IS - D22, 27

M1 - D22203

ER -

Hygroscopic growth and CCN activity of HULIS from different environments

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