Aerosol optical hygroscopicity measurements during the 2010 CARES campaign
Measurements of the effect of water uptake on particulate light extinction or scattering made at two locations during the 2010 Carbonaceous Aerosols and Radiative Effects Study (CARES) study around Sacramento, CA are reported. The observed influence of water uptake, characterized through the dimensi...
| Автори: | , , , , , , , , , |
|---|---|
| Інші автори: | |
| Формат: | Стаття |
| Мова: | en_US |
| Опубліковано: |
Copernicus GmbH
2015
|
| Онлайн доступ: | http://hdl.handle.net/1721.1/98102 https://orcid.org/0000-0003-1851-8740 |
| _version_ | 1826196696414027776 |
|---|---|
| author | Atkinson, D. B. Radney, J. G. Lum, J. Kolesar, K. R. Pekour, M. S. Zhang, Q. Setyan, A. Zelenyuk, A. Cappa, C. D. Cziczo, Daniel James |
| 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 Atkinson, D. B. Radney, J. G. Lum, J. Kolesar, K. R. Pekour, M. S. Zhang, Q. Setyan, A. Zelenyuk, A. Cappa, C. D. Cziczo, Daniel James |
| author_sort | Atkinson, D. B. |
| collection | MIT |
| description | Measurements of the effect of water uptake on particulate light extinction or scattering made at two locations during the 2010 Carbonaceous Aerosols and Radiative Effects Study (CARES) study around Sacramento, CA are reported. The observed influence of water uptake, characterized through the dimensionless optical hygroscopicity parameter γ, is compared with calculations constrained by observed particle size distributions and size-dependent particle composition. A closure assessment has been carried out that allowed for determination of the average hygroscopic growth factors (GFs) at 85% relative humidity and the dimensionless hygroscopicity parameter κ for oxygenated organic aerosol (OA) and for supermicron particles (defined here as particles with aerodynamic diameters between 1 and 2.5 microns), yielding κ = 0.1–0.15 and 0.9–1.0, respectively. The derived range of oxygenated OA κ values are in line with previous observations. The relatively large values for supermicron particles is consistent with substantial contributions of sea-salt-containing particles in this size range. Analysis of time-dependent variations in the supermicron particle hygroscopicity suggest that atmospheric processing, specifically chloride displacement by nitrate and the accumulation of secondary organics on supermicron particles, can lead to substantial depression of the observed GF. |
| first_indexed | 2024-09-23T10:35:17Z |
| format | Article |
| id | mit-1721.1/98102 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T10:35:17Z |
| publishDate | 2015 |
| publisher | Copernicus GmbH |
| record_format | dspace |
| spelling | mit-1721.1/981022022-09-30T21:41:51Z Aerosol optical hygroscopicity measurements during the 2010 CARES campaign Atkinson, D. B. Radney, J. G. Lum, J. Kolesar, K. R. Pekour, M. S. Zhang, Q. Setyan, A. Zelenyuk, A. Cappa, C. D. Cziczo, Daniel James Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Cziczo, Daniel James Measurements of the effect of water uptake on particulate light extinction or scattering made at two locations during the 2010 Carbonaceous Aerosols and Radiative Effects Study (CARES) study around Sacramento, CA are reported. The observed influence of water uptake, characterized through the dimensionless optical hygroscopicity parameter γ, is compared with calculations constrained by observed particle size distributions and size-dependent particle composition. A closure assessment has been carried out that allowed for determination of the average hygroscopic growth factors (GFs) at 85% relative humidity and the dimensionless hygroscopicity parameter κ for oxygenated organic aerosol (OA) and for supermicron particles (defined here as particles with aerodynamic diameters between 1 and 2.5 microns), yielding κ = 0.1–0.15 and 0.9–1.0, respectively. The derived range of oxygenated OA κ values are in line with previous observations. The relatively large values for supermicron particles is consistent with substantial contributions of sea-salt-containing particles in this size range. Analysis of time-dependent variations in the supermicron particle hygroscopicity suggest that atmospheric processing, specifically chloride displacement by nitrate and the accumulation of secondary organics on supermicron particles, can lead to substantial depression of the observed GF. 2015-08-19T17:15:04Z 2015-08-19T17:15:04Z 2015-04 2015-03 Article http://purl.org/eprint/type/JournalArticle 1680-7324 1680-7316 http://hdl.handle.net/1721.1/98102 Atkinson, D. B., J. G. Radney, J. Lum, K. R. Kolesar, D. J. Cziczo, M. S. Pekour, Q. Zhang, A. Setyan, A. Zelenyuk, and C. D. Cappa. “Aerosol Optical Hygroscopicity Measurements During the 2010 CARES Campaign.” Atmos. Chem. Phys. 15, no. 8 (2015): 4045–4061. https://orcid.org/0000-0003-1851-8740 en_US http://dx.doi.org/10.5194/acp-15-4045-2015 Atmospheric Chemistry and Physics Creative Commons Attribution http://creativecommons.org/licenses/by/3.0/ application/pdf Copernicus GmbH Copernicus Publications |
| spellingShingle | Atkinson, D. B. Radney, J. G. Lum, J. Kolesar, K. R. Pekour, M. S. Zhang, Q. Setyan, A. Zelenyuk, A. Cappa, C. D. Cziczo, Daniel James Aerosol optical hygroscopicity measurements during the 2010 CARES campaign |
| title | Aerosol optical hygroscopicity measurements during the 2010 CARES campaign |
| title_full | Aerosol optical hygroscopicity measurements during the 2010 CARES campaign |
| title_fullStr | Aerosol optical hygroscopicity measurements during the 2010 CARES campaign |
| title_full_unstemmed | Aerosol optical hygroscopicity measurements during the 2010 CARES campaign |
| title_short | Aerosol optical hygroscopicity measurements during the 2010 CARES campaign |
| title_sort | aerosol optical hygroscopicity measurements during the 2010 cares campaign |
| url | http://hdl.handle.net/1721.1/98102 https://orcid.org/0000-0003-1851-8740 |
| work_keys_str_mv | AT atkinsondb aerosolopticalhygroscopicitymeasurementsduringthe2010carescampaign AT radneyjg aerosolopticalhygroscopicitymeasurementsduringthe2010carescampaign AT lumj aerosolopticalhygroscopicitymeasurementsduringthe2010carescampaign AT kolesarkr aerosolopticalhygroscopicitymeasurementsduringthe2010carescampaign AT pekourms aerosolopticalhygroscopicitymeasurementsduringthe2010carescampaign AT zhangq aerosolopticalhygroscopicitymeasurementsduringthe2010carescampaign AT setyana aerosolopticalhygroscopicitymeasurementsduringthe2010carescampaign AT zelenyuka aerosolopticalhygroscopicitymeasurementsduringthe2010carescampaign AT cappacd aerosolopticalhygroscopicitymeasurementsduringthe2010carescampaign AT cziczodanieljames aerosolopticalhygroscopicitymeasurementsduringthe2010carescampaign |