Laboratory studies of collection efficiency of sub-micrometer aerosol particles by cloud droplets on a single-droplet basis
An experimental setup has been constructed to measure the collection efficiency (CE) of sub-micrometer aerosol particles by cloud droplets. Droplets of a dilute aqueous ammonium sulfate solution with an average radius of 21.6 μm fall freely into a chamber and collide with sub-micrometer polystyrene...
| Main Authors: | , , |
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| Format: | Article |
| Language: | en_US |
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Copernicus GmbH
2015
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| Online Access: | http://hdl.handle.net/1721.1/98346 https://orcid.org/0000-0003-1851-8740 |
| _version_ | 1811076603346681856 |
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| author | Ardon Dryer, Karin Cziczo, Daniel James Huang, Y.-W. |
| 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 Ardon Dryer, Karin Cziczo, Daniel James Huang, Y.-W. |
| author_sort | Ardon Dryer, Karin |
| collection | MIT |
| description | An experimental setup has been constructed to measure the collection efficiency (CE) of sub-micrometer aerosol particles by cloud droplets. Droplets of a dilute aqueous ammonium sulfate solution with an average radius of 21.6 μm fall freely into a chamber and collide with sub-micrometer polystyrene latex (PSL) sphere particles of known sizes and concentrations. Two relative humidity (RH) conditions, 15 ± 3 % and 88 ± 3 %, hereafter termed "low" and "high", respectively, were varied with different particles sizes and concentrations. After passing through the chamber, the droplets and aerosol particles were sent to the Particle Analysis by Laser Mass Spectrometry (PALMS) instrument to determine chemical compositions on a single-droplet basis. "Coagulated droplets" (droplets that collected aerosols) had mass spectra that contained signatures from both an aerosol particle and a droplet residual. CE values range from 2.0 × 10[superscript −1] to 1.6 for the low-RH case and from 1.5 × 10[superscript −2] to 9.0 × 10[superscript −2] for the high-RH case. CE values were, within experimental uncertainty, independent of the aerosol concentrations. CE values in this study were found to be in agreement with previous experimental and theoretical studies. To our knowledge, this is the first collection experiment performed on a single-droplet basis with atmospherically relevant conditions such as droplet sizes, droplet charges and flow. |
| first_indexed | 2024-09-23T10:24:45Z |
| format | Article |
| id | mit-1721.1/98346 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T10:24:45Z |
| publishDate | 2015 |
| publisher | Copernicus GmbH |
| record_format | dspace |
| spelling | mit-1721.1/983462024-05-15T08:04:59Z Laboratory studies of collection efficiency of sub-micrometer aerosol particles by cloud droplets on a single-droplet basis Ardon Dryer, Karin Cziczo, Daniel James Huang, Y.-W. Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Ardon Dryer, Karin Huang, Yi-wen Cziczo, Daniel James An experimental setup has been constructed to measure the collection efficiency (CE) of sub-micrometer aerosol particles by cloud droplets. Droplets of a dilute aqueous ammonium sulfate solution with an average radius of 21.6 μm fall freely into a chamber and collide with sub-micrometer polystyrene latex (PSL) sphere particles of known sizes and concentrations. Two relative humidity (RH) conditions, 15 ± 3 % and 88 ± 3 %, hereafter termed "low" and "high", respectively, were varied with different particles sizes and concentrations. After passing through the chamber, the droplets and aerosol particles were sent to the Particle Analysis by Laser Mass Spectrometry (PALMS) instrument to determine chemical compositions on a single-droplet basis. "Coagulated droplets" (droplets that collected aerosols) had mass spectra that contained signatures from both an aerosol particle and a droplet residual. CE values range from 2.0 × 10[superscript −1] to 1.6 for the low-RH case and from 1.5 × 10[superscript −2] to 9.0 × 10[superscript −2] for the high-RH case. CE values were, within experimental uncertainty, independent of the aerosol concentrations. CE values in this study were found to be in agreement with previous experimental and theoretical studies. To our knowledge, this is the first collection experiment performed on a single-droplet basis with atmospherically relevant conditions such as droplet sizes, droplet charges and flow. United States. National Oceanic and Atmospheric Administration. Office of Oceanic and Atmospheric Research (Grant NA11OAR4310159) 2015-09-03T13:10:45Z 2015-09-03T13:10:45Z 2015-08 2015-01 Article http://purl.org/eprint/type/JournalArticle 1680-7324 1680-7316 http://hdl.handle.net/1721.1/98346 Ardon-Dryer, K., Y.-W. Huang, and D. J. Cziczo. “Laboratory Studies of Collection Efficiency of Sub-Micrometer Aerosol Particles by Cloud Droplets on a Single-Droplet Basis.” Atmos. Chem. Phys. 15, no. 16 (2015): 9159–9171. https://orcid.org/0000-0003-1851-8740 en_US http://dx.doi.org/10.5194/acp-15-9159-2015 Atmospheric Chemistry and Physics Creative Commons Attribution http://creativecommons.org/licenses/by/3.0/ application/pdf Copernicus GmbH Copernicus |
| spellingShingle | Ardon Dryer, Karin Cziczo, Daniel James Huang, Y.-W. Laboratory studies of collection efficiency of sub-micrometer aerosol particles by cloud droplets on a single-droplet basis |
| title | Laboratory studies of collection efficiency of sub-micrometer aerosol particles by cloud droplets on a single-droplet basis |
| title_full | Laboratory studies of collection efficiency of sub-micrometer aerosol particles by cloud droplets on a single-droplet basis |
| title_fullStr | Laboratory studies of collection efficiency of sub-micrometer aerosol particles by cloud droplets on a single-droplet basis |
| title_full_unstemmed | Laboratory studies of collection efficiency of sub-micrometer aerosol particles by cloud droplets on a single-droplet basis |
| title_short | Laboratory studies of collection efficiency of sub-micrometer aerosol particles by cloud droplets on a single-droplet basis |
| title_sort | laboratory studies of collection efficiency of sub micrometer aerosol particles by cloud droplets on a single droplet basis |
| url | http://hdl.handle.net/1721.1/98346 https://orcid.org/0000-0003-1851-8740 |
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