Size-resolved aerosol and cloud condensation nuclei (CCN) properties in the remote marine South China Sea – Part 1: Observations and source classification
Ship-based measurements of aerosol and cloud condensation nuclei (CCN) properties are presented for 2 weeks of observations in remote marine regions of the South China Sea/East Sea during the southwestern monsoon (SWM) season. Smoke from extensive biomass burning throughout the Maritime Continent ad...
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2017-01-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | http://www.atmos-chem-phys.net/17/1105/2017/acp-17-1105-2017.pdf |
| _version_ | 1818991886830927872 |
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| author | S. A. Atwood J. S. Reid S. M. Kreidenweis D. R. Blake H. H. Jonsson N. D. Lagrosas P. Xian E. A. Reid W. R. Sessions J. B. Simpas |
| author_facet | S. A. Atwood J. S. Reid S. M. Kreidenweis D. R. Blake H. H. Jonsson N. D. Lagrosas P. Xian E. A. Reid W. R. Sessions J. B. Simpas |
| author_sort | S. A. Atwood |
| collection | DOAJ |
| description | Ship-based measurements of aerosol and cloud condensation
nuclei (CCN) properties are presented for 2 weeks of observations in
remote marine regions of the South China Sea/East Sea during the
southwestern monsoon (SWM) season. Smoke from extensive biomass burning
throughout the Maritime Continent advected into this region during the SWM,
where it was mixed with anthropogenic continental pollution and emissions
from heavy shipping activities. Eight aerosol types were identified using a
k-means cluster analysis with data from a size-resolved CCN characterization
system. Interpretation of the clusters was supplemented by additional
onboard aerosol and meteorological measurements, satellite, and model
products for the region. A typical bimodal marine boundary layer background
aerosol population was identified and observed mixing with accumulation mode
aerosol from other sources, primarily smoke from fires in Borneo and
Sumatra. Hygroscopicity was assessed using the <i>κ</i> parameter and was
found to average 0.40 for samples dominated by aged accumulation mode
smoke; 0.65 for accumulation mode marine aerosol; 0.60 in an anthropogenic
aerosol plume; and 0.22 during a short period that was characterized by
elevated levels of volatile organic compounds not associated with biomass
burning impacts. As a special subset of the background marine aerosol, clean
air masses substantially scrubbed of particles were observed following heavy
precipitation or the passage of squall lines, with changes in observed
aerosol properties occurring on the order of minutes. Average CN number
concentrations, size distributions, and <i>κ</i> values are reported for
each population type, along with CCN number concentrations for particles
that activated at supersaturations between 0.14 and 0.85 %. |
| first_indexed | 2024-12-20T20:17:24Z |
| format | Article |
| id | doaj.art-d9dddf7572dc4202989c050f61e499d5 |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-12-20T20:17:24Z |
| publishDate | 2017-01-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-d9dddf7572dc4202989c050f61e499d52022-12-21T19:27:40ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242017-01-011721105112310.5194/acp-17-1105-2017Size-resolved aerosol and cloud condensation nuclei (CCN) properties in the remote marine South China Sea – Part 1: Observations and source classificationS. A. Atwood0J. S. Reid1S. M. Kreidenweis2D. R. Blake3H. H. Jonsson4N. D. Lagrosas5P. Xian6E. A. Reid7W. R. Sessions8J. B. Simpas9Department of Atmospheric Science, Colorado State University, Ft. Collins, CO, USAMarine Meteorology Division, Naval Research Laboratory, Monterey, CA, USADepartment of Atmospheric Science, Colorado State University, Ft. Collins, CO, USADepartment of Chemistry, University of California, Irvine, CA, USADepartment of Meteorology, Naval Postgraduate School, Monterey, CA, USAManila Observatory, Manila, PhilippinesCSC Inc. at Naval Research Laboratory, Monterey, CA, USAMarine Meteorology Division, Naval Research Laboratory, Monterey, CA, USACSC Inc. at Naval Research Laboratory, Monterey, CA, USAManila Observatory, Manila, PhilippinesShip-based measurements of aerosol and cloud condensation nuclei (CCN) properties are presented for 2 weeks of observations in remote marine regions of the South China Sea/East Sea during the southwestern monsoon (SWM) season. Smoke from extensive biomass burning throughout the Maritime Continent advected into this region during the SWM, where it was mixed with anthropogenic continental pollution and emissions from heavy shipping activities. Eight aerosol types were identified using a k-means cluster analysis with data from a size-resolved CCN characterization system. Interpretation of the clusters was supplemented by additional onboard aerosol and meteorological measurements, satellite, and model products for the region. A typical bimodal marine boundary layer background aerosol population was identified and observed mixing with accumulation mode aerosol from other sources, primarily smoke from fires in Borneo and Sumatra. Hygroscopicity was assessed using the <i>κ</i> parameter and was found to average 0.40 for samples dominated by aged accumulation mode smoke; 0.65 for accumulation mode marine aerosol; 0.60 in an anthropogenic aerosol plume; and 0.22 during a short period that was characterized by elevated levels of volatile organic compounds not associated with biomass burning impacts. As a special subset of the background marine aerosol, clean air masses substantially scrubbed of particles were observed following heavy precipitation or the passage of squall lines, with changes in observed aerosol properties occurring on the order of minutes. Average CN number concentrations, size distributions, and <i>κ</i> values are reported for each population type, along with CCN number concentrations for particles that activated at supersaturations between 0.14 and 0.85 %.http://www.atmos-chem-phys.net/17/1105/2017/acp-17-1105-2017.pdf |
| spellingShingle | S. A. Atwood J. S. Reid S. M. Kreidenweis D. R. Blake H. H. Jonsson N. D. Lagrosas P. Xian E. A. Reid W. R. Sessions J. B. Simpas Size-resolved aerosol and cloud condensation nuclei (CCN) properties in the remote marine South China Sea – Part 1: Observations and source classification Atmospheric Chemistry and Physics |
| title | Size-resolved aerosol and cloud condensation nuclei (CCN) properties in the remote marine South China Sea – Part 1: Observations and source classification |
| title_full | Size-resolved aerosol and cloud condensation nuclei (CCN) properties in the remote marine South China Sea – Part 1: Observations and source classification |
| title_fullStr | Size-resolved aerosol and cloud condensation nuclei (CCN) properties in the remote marine South China Sea – Part 1: Observations and source classification |
| title_full_unstemmed | Size-resolved aerosol and cloud condensation nuclei (CCN) properties in the remote marine South China Sea – Part 1: Observations and source classification |
| title_short | Size-resolved aerosol and cloud condensation nuclei (CCN) properties in the remote marine South China Sea – Part 1: Observations and source classification |
| title_sort | size resolved aerosol and cloud condensation nuclei ccn properties in the remote marine south china sea part 1 observations and source classification |
| url | http://www.atmos-chem-phys.net/17/1105/2017/acp-17-1105-2017.pdf |
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