Optical particle counter measurement of marine aerosol hygroscopic growth
A technique is developed for the determination of the hygroscopic growth factor of dry particles with diameter between 0.3 and 0.6 μm and is applied to measurements made during the second Dynamics and Chemistry of Marine Stratocumulus experiment (DYCOMS-II). Two optical particle counters are utilize...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2008-04-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | http://www.atmos-chem-phys.net/8/1949/2008/acp-8-1949-2008.pdf |
| _version_ | 1818142181020401664 |
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| author | J. R. Snider M. D. Petters |
| author_facet | J. R. Snider M. D. Petters |
| author_sort | J. R. Snider |
| collection | DOAJ |
| description | A technique is developed for the determination of the hygroscopic growth factor of dry particles with diameter between 0.3 and 0.6 μm and is applied to measurements made during the second Dynamics and Chemistry of Marine Stratocumulus experiment (DYCOMS-II). Two optical particle counters are utilized, one measures the aerosol size spectrum at ambient relative humidity and the other simultaneously dries the aerosol prior to light scattering detection. Growth factors are based on measurements made in the region of the Mie scattering curve where scattered light intensity increases monotonically with dry and wet particle diameter, i.e. <I>D</I>&lt;0.9 μm. Factors influencing the accuracy of the measurement are evaluated, including particle drying, refractive index and shape. Growth factors at 90&plusmn;3% ambient relative humidity in marine airmasses 400 km west of San Diego, California range between 1.5 and 1.8. This suggests that a significant fraction of the particle mass, between 40 and 70%, is either non-hygroscopic or weakly hygroscopic. |
| first_indexed | 2024-12-11T11:11:41Z |
| format | Article |
| id | doaj.art-9a408f58dbeb40fa8c1024550d629377 |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-12-11T11:11:41Z |
| publishDate | 2008-04-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-9a408f58dbeb40fa8c1024550d6293772022-12-22T01:09:30ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242008-04-018719491962Optical particle counter measurement of marine aerosol hygroscopic growthJ. R. SniderM. D. PettersA technique is developed for the determination of the hygroscopic growth factor of dry particles with diameter between 0.3 and 0.6 μm and is applied to measurements made during the second Dynamics and Chemistry of Marine Stratocumulus experiment (DYCOMS-II). Two optical particle counters are utilized, one measures the aerosol size spectrum at ambient relative humidity and the other simultaneously dries the aerosol prior to light scattering detection. Growth factors are based on measurements made in the region of the Mie scattering curve where scattered light intensity increases monotonically with dry and wet particle diameter, i.e. <I>D</I>&lt;0.9 μm. Factors influencing the accuracy of the measurement are evaluated, including particle drying, refractive index and shape. Growth factors at 90&plusmn;3% ambient relative humidity in marine airmasses 400 km west of San Diego, California range between 1.5 and 1.8. This suggests that a significant fraction of the particle mass, between 40 and 70%, is either non-hygroscopic or weakly hygroscopic.http://www.atmos-chem-phys.net/8/1949/2008/acp-8-1949-2008.pdf |
| spellingShingle | J. R. Snider M. D. Petters Optical particle counter measurement of marine aerosol hygroscopic growth Atmospheric Chemistry and Physics |
| title | Optical particle counter measurement of marine aerosol hygroscopic growth |
| title_full | Optical particle counter measurement of marine aerosol hygroscopic growth |
| title_fullStr | Optical particle counter measurement of marine aerosol hygroscopic growth |
| title_full_unstemmed | Optical particle counter measurement of marine aerosol hygroscopic growth |
| title_short | Optical particle counter measurement of marine aerosol hygroscopic growth |
| title_sort | optical particle counter measurement of marine aerosol hygroscopic growth |
| url | http://www.atmos-chem-phys.net/8/1949/2008/acp-8-1949-2008.pdf |
| work_keys_str_mv | AT jrsnider opticalparticlecountermeasurementofmarineaerosolhygroscopicgrowth AT mdpetters opticalparticlecountermeasurementofmarineaerosolhygroscopicgrowth |