Effect of primary organic sea spray emissions on cloud condensation nuclei concentrations
This work estimates the primary marine organic aerosol global emission source and its impact on cloud condensation nuclei (CCN) concentrations by implementing an organic sea spray source function into a series of global aerosol simulations. The source function assumes that a fraction of the sea spra...
Published in: | Atmospheric Chemistry and Physics |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2012
|
Subjects: | |
Online Access: | https://doi.org/10.5194/acp-12-89-2012 https://noa.gwlb.de/receive/cop_mods_00046211 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00045831/acp-12-89-2012.pdf https://acp.copernicus.org/articles/12/89/2012/acp-12-89-2012.pdf |
id |
ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00046211 |
---|---|
record_format |
openpolar |
spelling |
ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00046211 2023-05-15T18:25:22+02:00 Effect of primary organic sea spray emissions on cloud condensation nuclei concentrations Westervelt, D. M. Moore, R. H. Nenes, A. Adams, P. J. 2012-01 electronic https://doi.org/10.5194/acp-12-89-2012 https://noa.gwlb.de/receive/cop_mods_00046211 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00045831/acp-12-89-2012.pdf https://acp.copernicus.org/articles/12/89/2012/acp-12-89-2012.pdf eng eng Copernicus Publications Atmospheric Chemistry and Physics -- http://www.atmos-chem-phys.net/volumes_and_issues.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2069847 -- 1680-7324 https://doi.org/10.5194/acp-12-89-2012 https://noa.gwlb.de/receive/cop_mods_00046211 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00045831/acp-12-89-2012.pdf https://acp.copernicus.org/articles/12/89/2012/acp-12-89-2012.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2012 ftnonlinearchiv https://doi.org/10.5194/acp-12-89-2012 2022-02-08T22:39:12Z This work estimates the primary marine organic aerosol global emission source and its impact on cloud condensation nuclei (CCN) concentrations by implementing an organic sea spray source function into a series of global aerosol simulations. The source function assumes that a fraction of the sea spray emissions, depending on the local chlorophyll concentration, is organic matter in place of sea salt. Effect on CCN concentrations (at 0.2% supersaturation) is modeled using the Two-Moment Aerosol Sectional (TOMAS) microphysics algorithm coupled to the GISS II-prime general circulation model. The presence of organics affects CCN activity in competing ways: by reducing the amount of solute available in the particle and decreasing surface tension of CCN. To model surfactant effects, surface tension depression data from seawater samples taken near the Georgia coast were applied as a function of carbon concentrations. A global marine organic aerosol emission rate of 17.7 Tg C yr−1 is estimated from the simulations. Marine organics exert a localized influence on CCN(0.2%) concentrations, decreasing regional concentrations by no more than 5% and by less than 0.5% over most of the globe, assuming direct replacement of sea salt aerosol with organic aerosol. The decrease in CCN concentrations results from the fact that the decrease in particle solute concentration outweighs the organic surfactant effects. The low sensitivity of CCN(0.2%) to the marine organic emissions is likely due to the small compositional changes: the mass fraction of OA in accumulation mode aerosol increases by only ~15% in a biologically active region of the Southern Ocean. To test the sensitivity to uncertainty in the sea spray emissions process, we relax the assumption that sea spray aerosol number and mass remain fixed and instead can add to sea spray emissions rather than replace existing sea salt. In these simulations, we find that marine organic aerosol can increase CCN by up to 50% in the Southern Ocean and 3.7% globally during the austral summer. This vast difference in CCN impact highlights the need for further observational exploration of the sea spray aerosol emission process as well as evaluation and development of model parameterizations. Article in Journal/Newspaper Southern Ocean Niedersächsisches Online-Archiv NOA Austral Southern Ocean Atmospheric Chemistry and Physics 12 1 89 101 |
institution |
Open Polar |
collection |
Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Westervelt, D. M. Moore, R. H. Nenes, A. Adams, P. J. Effect of primary organic sea spray emissions on cloud condensation nuclei concentrations |
topic_facet |
article Verlagsveröffentlichung |
description |
This work estimates the primary marine organic aerosol global emission source and its impact on cloud condensation nuclei (CCN) concentrations by implementing an organic sea spray source function into a series of global aerosol simulations. The source function assumes that a fraction of the sea spray emissions, depending on the local chlorophyll concentration, is organic matter in place of sea salt. Effect on CCN concentrations (at 0.2% supersaturation) is modeled using the Two-Moment Aerosol Sectional (TOMAS) microphysics algorithm coupled to the GISS II-prime general circulation model. The presence of organics affects CCN activity in competing ways: by reducing the amount of solute available in the particle and decreasing surface tension of CCN. To model surfactant effects, surface tension depression data from seawater samples taken near the Georgia coast were applied as a function of carbon concentrations. A global marine organic aerosol emission rate of 17.7 Tg C yr−1 is estimated from the simulations. Marine organics exert a localized influence on CCN(0.2%) concentrations, decreasing regional concentrations by no more than 5% and by less than 0.5% over most of the globe, assuming direct replacement of sea salt aerosol with organic aerosol. The decrease in CCN concentrations results from the fact that the decrease in particle solute concentration outweighs the organic surfactant effects. The low sensitivity of CCN(0.2%) to the marine organic emissions is likely due to the small compositional changes: the mass fraction of OA in accumulation mode aerosol increases by only ~15% in a biologically active region of the Southern Ocean. To test the sensitivity to uncertainty in the sea spray emissions process, we relax the assumption that sea spray aerosol number and mass remain fixed and instead can add to sea spray emissions rather than replace existing sea salt. In these simulations, we find that marine organic aerosol can increase CCN by up to 50% in the Southern Ocean and 3.7% globally during the austral summer. This vast difference in CCN impact highlights the need for further observational exploration of the sea spray aerosol emission process as well as evaluation and development of model parameterizations. |
format |
Article in Journal/Newspaper |
author |
Westervelt, D. M. Moore, R. H. Nenes, A. Adams, P. J. |
author_facet |
Westervelt, D. M. Moore, R. H. Nenes, A. Adams, P. J. |
author_sort |
Westervelt, D. M. |
title |
Effect of primary organic sea spray emissions on cloud condensation nuclei concentrations |
title_short |
Effect of primary organic sea spray emissions on cloud condensation nuclei concentrations |
title_full |
Effect of primary organic sea spray emissions on cloud condensation nuclei concentrations |
title_fullStr |
Effect of primary organic sea spray emissions on cloud condensation nuclei concentrations |
title_full_unstemmed |
Effect of primary organic sea spray emissions on cloud condensation nuclei concentrations |
title_sort |
effect of primary organic sea spray emissions on cloud condensation nuclei concentrations |
publisher |
Copernicus Publications |
publishDate |
2012 |
url |
https://doi.org/10.5194/acp-12-89-2012 https://noa.gwlb.de/receive/cop_mods_00046211 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00045831/acp-12-89-2012.pdf https://acp.copernicus.org/articles/12/89/2012/acp-12-89-2012.pdf |
geographic |
Austral Southern Ocean |
geographic_facet |
Austral Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
Atmospheric Chemistry and Physics -- http://www.atmos-chem-phys.net/volumes_and_issues.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2069847 -- 1680-7324 https://doi.org/10.5194/acp-12-89-2012 https://noa.gwlb.de/receive/cop_mods_00046211 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00045831/acp-12-89-2012.pdf https://acp.copernicus.org/articles/12/89/2012/acp-12-89-2012.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/acp-12-89-2012 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
12 |
container_issue |
1 |
container_start_page |
89 |
op_container_end_page |
101 |
_version_ |
1766206782622924800 |