Oxidation of ambient biogenic secondary organic aerosol by hydroxyl radicals: Effects on cloud condensation nuclei activity
Changes in the hygroscopicity of ambient biogenic secondary organic aerosols (SOA) due to controlled OH oxidation were investigated at a remote forested site at Whistler Mountain, British Columbia during July of 2010. Coupled photo-oxidation and cloud condensation nuclei (CCN) experiments were condu...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | en_US |
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American Geophysical Union (AGU)
2012
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| Online Access: | http://hdl.handle.net/1721.1/75747 https://orcid.org/0000-0003-1851-8740 |
| _version_ | 1826210629342461952 |
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| author | Wong, J. P. S. Lee, A. K. Y. Slowik, J. G. Cziczo, Daniel James Leaitch, W. R. MacDonald, A. Abbatt, Jonathan P. D. |
| author2 | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences |
| author_facet | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Wong, J. P. S. Lee, A. K. Y. Slowik, J. G. Cziczo, Daniel James Leaitch, W. R. MacDonald, A. Abbatt, Jonathan P. D. |
| author_sort | Wong, J. P. S. |
| collection | MIT |
| description | Changes in the hygroscopicity of ambient biogenic secondary organic aerosols (SOA) due to controlled OH oxidation were investigated at a remote forested site at Whistler Mountain, British Columbia during July of 2010. Coupled photo-oxidation and cloud condensation nuclei (CCN) experiments were conducted on: i) ambient particles exposed to high levels of gas-phase OH, and ii) the water-soluble fraction of ambient particles oxidized by aqueous-phase OH. An Aerodyne Aerosol Mass Spectrometer (AMS) monitored the changes in the chemical composition and degree of oxidation (O:C ratio) of the organic component of ambient aerosol due to OH oxidation. The CCN activity of size-selected particles was measured to determine the hygroscopicity parameter κ[subscript org,CCN] for particles of various degrees of oxygenation. In both cases, the CCN activity of the oxidized material was higher than that of the ambient particles. In general, κorg,CCN of the aerosol increases with its O:C ratio, in agreement with previous laboratory measurements. |
| first_indexed | 2024-09-23T14:52:40Z |
| format | Article |
| id | mit-1721.1/75747 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T14:52:40Z |
| publishDate | 2012 |
| publisher | American Geophysical Union (AGU) |
| record_format | dspace |
| spelling | mit-1721.1/757472022-10-01T23:05:40Z Oxidation of ambient biogenic secondary organic aerosol by hydroxyl radicals: Effects on cloud condensation nuclei activity Wong, J. P. S. Lee, A. K. Y. Slowik, J. G. Cziczo, Daniel James Leaitch, W. R. MacDonald, A. Abbatt, Jonathan P. D. Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Cziczo, Daniel Cziczo, Daniel James Changes in the hygroscopicity of ambient biogenic secondary organic aerosols (SOA) due to controlled OH oxidation were investigated at a remote forested site at Whistler Mountain, British Columbia during July of 2010. Coupled photo-oxidation and cloud condensation nuclei (CCN) experiments were conducted on: i) ambient particles exposed to high levels of gas-phase OH, and ii) the water-soluble fraction of ambient particles oxidized by aqueous-phase OH. An Aerodyne Aerosol Mass Spectrometer (AMS) monitored the changes in the chemical composition and degree of oxidation (O:C ratio) of the organic component of ambient aerosol due to OH oxidation. The CCN activity of size-selected particles was measured to determine the hygroscopicity parameter κ[subscript org,CCN] for particles of various degrees of oxygenation. In both cases, the CCN activity of the oxidized material was higher than that of the ambient particles. In general, κorg,CCN of the aerosol increases with its O:C ratio, in agreement with previous laboratory measurements. Natural Sciences and Engineering Research Council of Canada (NSERC) Canada. Environment Canada Canadian Foundation for Climate and Atmospheric Sciences (Cloud-Aerosol Feedbacks and Climate) 2012-12-17T20:05:46Z 2012-12-17T20:05:46Z 2011-11 2011-10 Article http://purl.org/eprint/type/JournalArticle 0094-8276 http://hdl.handle.net/1721.1/75747 Wong, J. P. S. et al. “Oxidation of Ambient Biogenic Secondary Organic Aerosol by Hydroxyl Radicals: Effects on Cloud Condensation Nuclei Activity.” Geophysical Research Letters 38.22 (2011). ©2012. American Geophysical Union https://orcid.org/0000-0003-1851-8740 en_US http://dx.doi.org/10.1029/2011gl049351 Geophysical Research Letters Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Geophysical Union (AGU) Prof. Cziczo via Chris Sherratt |
| spellingShingle | Wong, J. P. S. Lee, A. K. Y. Slowik, J. G. Cziczo, Daniel James Leaitch, W. R. MacDonald, A. Abbatt, Jonathan P. D. Oxidation of ambient biogenic secondary organic aerosol by hydroxyl radicals: Effects on cloud condensation nuclei activity |
| title | Oxidation of ambient biogenic secondary organic aerosol by hydroxyl radicals: Effects on cloud condensation nuclei activity |
| title_full | Oxidation of ambient biogenic secondary organic aerosol by hydroxyl radicals: Effects on cloud condensation nuclei activity |
| title_fullStr | Oxidation of ambient biogenic secondary organic aerosol by hydroxyl radicals: Effects on cloud condensation nuclei activity |
| title_full_unstemmed | Oxidation of ambient biogenic secondary organic aerosol by hydroxyl radicals: Effects on cloud condensation nuclei activity |
| title_short | Oxidation of ambient biogenic secondary organic aerosol by hydroxyl radicals: Effects on cloud condensation nuclei activity |
| title_sort | oxidation of ambient biogenic secondary organic aerosol by hydroxyl radicals effects on cloud condensation nuclei activity |
| url | http://hdl.handle.net/1721.1/75747 https://orcid.org/0000-0003-1851-8740 |
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