Aerosol hygroscopicity and its link to chemical composition in the coastal atmosphere of Mace Head: marine and continental air masses
<p>Chemical composition and hygroscopicity closure of marine aerosol in high time resolution has not been achieved yet due to the difficulty involved in measuring the refractory sea-salt concentration in near-real time. In this study, attempts were made to achieve closure for marine aerosol ba...
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2020-03-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | https://www.atmos-chem-phys.net/20/3777/2020/acp-20-3777-2020.pdf |
| _version_ | 1819170960661544960 |
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| author | W. Xu W. Xu J. Ovadnevaite K. N. Fossum C. Lin R.-J. Huang R.-J. Huang C. O'Dowd D. Ceburnis |
| author_facet | W. Xu W. Xu J. Ovadnevaite K. N. Fossum C. Lin R.-J. Huang R.-J. Huang C. O'Dowd D. Ceburnis |
| author_sort | W. Xu |
| collection | DOAJ |
| description | <p>Chemical composition and hygroscopicity closure of marine
aerosol in high time resolution has not been achieved yet due to the
difficulty involved in measuring the refractory sea-salt concentration in near-real time.
In this study, attempts were made to achieve closure for marine aerosol
based on a humidified tandem differential mobility analyser (HTDMA) and a
high-resolution time-of-flight aerosol mass spectrometer (AMS) for
wintertime aerosol at Mace Head, Ireland. The aerosol hygroscopicity was
examined as a growth factor (GF) at 90 % relative humidity (RH). The
corresponding GFs of 35, 50, 75, 110 and 165 nm particles were
<span class="inline-formula">1.54±0.26</span>, <span class="inline-formula">1.60±0.29</span>, <span class="inline-formula">1.66±0.31</span>, <span class="inline-formula">1.72±0.29</span> and <span class="inline-formula">1.78±0.30</span> (mean <span class="inline-formula">±</span> standard deviation), respectively. Two contrasting air
masses (continental and marine) were selected to study the temporal
variation in hygroscopicity; the results demonstrated a clear diurnal
pattern in continental air masses, whereas no diurnal pattern was found in
marine air masses. In addition, wintertime aerosol was observed to be
largely externally mixed in both of the contrasting air masses. Concurrent high
time resolution PM<span class="inline-formula"><sub>1</sub></span> (particulate matter <span class="inline-formula"><i><</i>1</span> <span class="inline-formula">µ</span>m) chemical
composition data from combined AMS and MAAP measurements, comprising organic
matter, non-sea-salt sulfate, nitrate, ammonium, sea salt and black carbon
(BC), were used to predict aerosol hygroscopicity with the
Zdanovskii–Stokes–Robinson (ZSR) mixing rule. Overall, good agreement
(an <span class="inline-formula"><i>R</i><sup>2</sup></span> value of 0.824 and a slope of 1.02) was found between the growth
factor of 165 nm particles measured by the HTDMA (GF_HTDMA) and the growth factor derived from the AMS <span class="inline-formula">+</span> MAAP bulk
chemical composition (GF_AMS). Over
95 % of the estimated GF values exhibited less than a 10 % deviation for the
whole dataset, and this deviation was mostly attributed to the neglected
mixing state as a result of the bulk PM<span class="inline-formula"><sub>1</sub></span> composition.</p> |
| first_indexed | 2024-12-22T19:43:42Z |
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| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-12-22T19:43:42Z |
| publishDate | 2020-03-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-e1ce3b1a77664b4a98f54687c799c8892022-12-21T18:14:45ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242020-03-01203777379110.5194/acp-20-3777-2020Aerosol hygroscopicity and its link to chemical composition in the coastal atmosphere of Mace Head: marine and continental air massesW. Xu0W. Xu1J. Ovadnevaite2K. N. Fossum3C. Lin4R.-J. Huang5R.-J. Huang6C. O'Dowd7D. Ceburnis8School of Physics, Ryan Institute's Centre for Climate and Air Pollution Studies, and Marine Renewable Energy Ireland, National University of Ireland Galway, University Road, H91 CF50 Galway, IrelandState Key Laboratory of Loess and Quaternary Geology, Center for Excellence in Quaternary Science and Global Change, and Key Laboratory of Aerosol Chemistry and Physics, Institute of Earth Environment, Chinese Academy of Sciences, 710061 Xi'an, ChinaSchool of Physics, Ryan Institute's Centre for Climate and Air Pollution Studies, and Marine Renewable Energy Ireland, National University of Ireland Galway, University Road, H91 CF50 Galway, IrelandSchool of Physics, Ryan Institute's Centre for Climate and Air Pollution Studies, and Marine Renewable Energy Ireland, National University of Ireland Galway, University Road, H91 CF50 Galway, IrelandState Key Laboratory of Loess and Quaternary Geology, Center for Excellence in Quaternary Science and Global Change, and Key Laboratory of Aerosol Chemistry and Physics, Institute of Earth Environment, Chinese Academy of Sciences, 710061 Xi'an, ChinaState Key Laboratory of Loess and Quaternary Geology, Center for Excellence in Quaternary Science and Global Change, and Key Laboratory of Aerosol Chemistry and Physics, Institute of Earth Environment, Chinese Academy of Sciences, 710061 Xi'an, ChinaOpen Studio for Oceanic-Continental Climate and Environment Changes, Pilot National Laboratory for Marine Science and Technology (Qingdao), 266061 Qingdao, ChinaSchool of Physics, Ryan Institute's Centre for Climate and Air Pollution Studies, and Marine Renewable Energy Ireland, National University of Ireland Galway, University Road, H91 CF50 Galway, IrelandSchool of Physics, Ryan Institute's Centre for Climate and Air Pollution Studies, and Marine Renewable Energy Ireland, National University of Ireland Galway, University Road, H91 CF50 Galway, Ireland<p>Chemical composition and hygroscopicity closure of marine aerosol in high time resolution has not been achieved yet due to the difficulty involved in measuring the refractory sea-salt concentration in near-real time. In this study, attempts were made to achieve closure for marine aerosol based on a humidified tandem differential mobility analyser (HTDMA) and a high-resolution time-of-flight aerosol mass spectrometer (AMS) for wintertime aerosol at Mace Head, Ireland. The aerosol hygroscopicity was examined as a growth factor (GF) at 90 % relative humidity (RH). The corresponding GFs of 35, 50, 75, 110 and 165 nm particles were <span class="inline-formula">1.54±0.26</span>, <span class="inline-formula">1.60±0.29</span>, <span class="inline-formula">1.66±0.31</span>, <span class="inline-formula">1.72±0.29</span> and <span class="inline-formula">1.78±0.30</span> (mean <span class="inline-formula">±</span> standard deviation), respectively. Two contrasting air masses (continental and marine) were selected to study the temporal variation in hygroscopicity; the results demonstrated a clear diurnal pattern in continental air masses, whereas no diurnal pattern was found in marine air masses. In addition, wintertime aerosol was observed to be largely externally mixed in both of the contrasting air masses. Concurrent high time resolution PM<span class="inline-formula"><sub>1</sub></span> (particulate matter <span class="inline-formula"><i><</i>1</span> <span class="inline-formula">µ</span>m) chemical composition data from combined AMS and MAAP measurements, comprising organic matter, non-sea-salt sulfate, nitrate, ammonium, sea salt and black carbon (BC), were used to predict aerosol hygroscopicity with the Zdanovskii–Stokes–Robinson (ZSR) mixing rule. Overall, good agreement (an <span class="inline-formula"><i>R</i><sup>2</sup></span> value of 0.824 and a slope of 1.02) was found between the growth factor of 165 nm particles measured by the HTDMA (GF_HTDMA) and the growth factor derived from the AMS <span class="inline-formula">+</span> MAAP bulk chemical composition (GF_AMS). Over 95 % of the estimated GF values exhibited less than a 10 % deviation for the whole dataset, and this deviation was mostly attributed to the neglected mixing state as a result of the bulk PM<span class="inline-formula"><sub>1</sub></span> composition.</p>https://www.atmos-chem-phys.net/20/3777/2020/acp-20-3777-2020.pdf |
| spellingShingle | W. Xu W. Xu J. Ovadnevaite K. N. Fossum C. Lin R.-J. Huang R.-J. Huang C. O'Dowd D. Ceburnis Aerosol hygroscopicity and its link to chemical composition in the coastal atmosphere of Mace Head: marine and continental air masses Atmospheric Chemistry and Physics |
| title | Aerosol hygroscopicity and its link to chemical composition in the coastal atmosphere of Mace Head: marine and continental air masses |
| title_full | Aerosol hygroscopicity and its link to chemical composition in the coastal atmosphere of Mace Head: marine and continental air masses |
| title_fullStr | Aerosol hygroscopicity and its link to chemical composition in the coastal atmosphere of Mace Head: marine and continental air masses |
| title_full_unstemmed | Aerosol hygroscopicity and its link to chemical composition in the coastal atmosphere of Mace Head: marine and continental air masses |
| title_short | Aerosol hygroscopicity and its link to chemical composition in the coastal atmosphere of Mace Head: marine and continental air masses |
| title_sort | aerosol hygroscopicity and its link to chemical composition in the coastal atmosphere of mace head marine and continental air masses |
| url | https://www.atmos-chem-phys.net/20/3777/2020/acp-20-3777-2020.pdf |
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