Global Distribution and Climate Forcing of Marine Organic Aerosol: 1. Model Improvements and Evaluation
©2011 The Author(s). Marine organic aerosol emissions have been implemented and evaluated within the National Center of Atmospheric Research (NCAR)'s Community Atmosphere Model (CAM5) with the Pacific Northwest National Laboratory's 7-mode Modal Aerosol Module (MAM-7). Emissions of marine...
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ftmountainschol:oai:mountainscholar.org:20.500.11919/698 2023-05-15T18:25:32+02:00 Global Distribution and Climate Forcing of Marine Organic Aerosol: 1. Model Improvements and Evaluation Meskhidze, N. Xu, J. Gantt, B. Zhang, Y. Nenes, A. Ghan, S. J. Liu, Xiaohong Easter, R. Zaveri, R. 2011-11-23 application/pdf https://hdl.handle.net/20.500.11919/698 https://doi.org/10.5194/acp-11-11689-2011 English eng eng University of Wyoming. Libraries Faculty Publications - Atmospheric Science https://hdl.handle.net/20.500.11919/698 doi:10.5194/acp-11-11689-2011 http://creativecommons.org/licenses/by/3.0/ CC-BY Atmospheric Science Faculty Publications aerosol aerosol composition atmospheric modeling biogenic emission climate forcing climate modeling concentration (composition) isoprene marine atmosphere monoterpene parameterization phytoplankton sea salt seasonal variation seasonality Atlantic Ocean Atlantic Ocean (North) Pacific Northwest Pacific Ocean Pacific Ocean (North) Southern Ocean Engineering Journal contribution 2011 ftmountainschol https://doi.org/20.500.11919/698 https://doi.org/10.5194/acp-11-11689-2011 2022-03-07T21:05:12Z ©2011 The Author(s). Marine organic aerosol emissions have been implemented and evaluated within the National Center of Atmospheric Research (NCAR)'s Community Atmosphere Model (CAM5) with the Pacific Northwest National Laboratory's 7-mode Modal Aerosol Module (MAM-7). Emissions of marine primary organic aerosols (POA), phytoplankton-produced isoprene-and monoterpenes-derived secondary organic aerosols (SOA) and methane sulfonate (MS-) are shown to affect surface concentrations of organic aerosols in remote marine regions. Global emissions of submicron marine POA is estimated to be 7.9 and 9.4 Tg yr-1, for the Gantt et al. (2011) and Vignati et al. (2010) emission parameterizations, respectively. Marine sources of SOA and particulate MS-(containing both sulfur and carbon atoms) contribute an additional 0.2 and 5.1 Tg y-1, respectively. Widespread areas over productive waters of the Northern Atlantic, Northern Pacific, and the Southern Ocean show marine-source submicron organic aerosol surface concentrations of 100 ng m-3, with values up to 400 ng mg-3 over biologically productive areas. Comparison of long-term surface observations of water insoluble organic matter (WIOM) with POA concentrations from the two emission parameterizations shows that despite revealed discrepancies (often more than a factor of 2), both Gantt et al. (2011) and Vignati et al. (2010) formulations are able to capture the magnitude of marine organic aerosol concentrations, with the Gantt et al. (2011) parameterization attaining better seasonality. Model simulations show that the mixing state of the marine POA can impact the surface number concentration of cloud condensation nuclei (CCN). The largest increases (up to 20%) in CCN (at a supersaturation (S) of 0.2%) number concentration are obtained over biologically productive ocean waters when marine organic aerosol is assumed to be externally mixed with sea-salt. Assuming marine organics are internally-mixed with sea-salt provides diverse results with increases and decreases in the concentration of CCN over different parts of the ocean. The sign of the CCN change due to the addition of marine organics to sea-salt aerosol is determined by the relative significance of the increase in mean modal diameter due to addition of mass, and the decrease in particle hygroscopicity due to compositional changes in marine aerosol. Based on emerging evidence for increased CCN concentration over biologically active surface ocean areas/periods, our study suggests that treatment of sea spray in global climate models (GCMs) as an internal mixture of marine organic aerosols and sea-salt will likely lead to an underestimation in CCN number concentration. Other Non-Article Part of Journal/Newspaper Southern Ocean Mountain Scholar (Digital Collections of Colorado and Wyoming) Pacific Southern Ocean Atmospheric Chemistry and Physics 11 22 11689 11705 |
institution |
Open Polar |
collection |
Mountain Scholar (Digital Collections of Colorado and Wyoming) |
op_collection_id |
ftmountainschol |
language |
English |
topic |
aerosol aerosol composition atmospheric modeling biogenic emission climate forcing climate modeling concentration (composition) isoprene marine atmosphere monoterpene parameterization phytoplankton sea salt seasonal variation seasonality Atlantic Ocean Atlantic Ocean (North) Pacific Northwest Pacific Ocean Pacific Ocean (North) Southern Ocean Engineering |
spellingShingle |
aerosol aerosol composition atmospheric modeling biogenic emission climate forcing climate modeling concentration (composition) isoprene marine atmosphere monoterpene parameterization phytoplankton sea salt seasonal variation seasonality Atlantic Ocean Atlantic Ocean (North) Pacific Northwest Pacific Ocean Pacific Ocean (North) Southern Ocean Engineering Meskhidze, N. Xu, J. Gantt, B. Zhang, Y. Nenes, A. Ghan, S. J. Liu, Xiaohong Easter, R. Zaveri, R. Global Distribution and Climate Forcing of Marine Organic Aerosol: 1. Model Improvements and Evaluation |
topic_facet |
aerosol aerosol composition atmospheric modeling biogenic emission climate forcing climate modeling concentration (composition) isoprene marine atmosphere monoterpene parameterization phytoplankton sea salt seasonal variation seasonality Atlantic Ocean Atlantic Ocean (North) Pacific Northwest Pacific Ocean Pacific Ocean (North) Southern Ocean Engineering |
description |
©2011 The Author(s). Marine organic aerosol emissions have been implemented and evaluated within the National Center of Atmospheric Research (NCAR)'s Community Atmosphere Model (CAM5) with the Pacific Northwest National Laboratory's 7-mode Modal Aerosol Module (MAM-7). Emissions of marine primary organic aerosols (POA), phytoplankton-produced isoprene-and monoterpenes-derived secondary organic aerosols (SOA) and methane sulfonate (MS-) are shown to affect surface concentrations of organic aerosols in remote marine regions. Global emissions of submicron marine POA is estimated to be 7.9 and 9.4 Tg yr-1, for the Gantt et al. (2011) and Vignati et al. (2010) emission parameterizations, respectively. Marine sources of SOA and particulate MS-(containing both sulfur and carbon atoms) contribute an additional 0.2 and 5.1 Tg y-1, respectively. Widespread areas over productive waters of the Northern Atlantic, Northern Pacific, and the Southern Ocean show marine-source submicron organic aerosol surface concentrations of 100 ng m-3, with values up to 400 ng mg-3 over biologically productive areas. Comparison of long-term surface observations of water insoluble organic matter (WIOM) with POA concentrations from the two emission parameterizations shows that despite revealed discrepancies (often more than a factor of 2), both Gantt et al. (2011) and Vignati et al. (2010) formulations are able to capture the magnitude of marine organic aerosol concentrations, with the Gantt et al. (2011) parameterization attaining better seasonality. Model simulations show that the mixing state of the marine POA can impact the surface number concentration of cloud condensation nuclei (CCN). The largest increases (up to 20%) in CCN (at a supersaturation (S) of 0.2%) number concentration are obtained over biologically productive ocean waters when marine organic aerosol is assumed to be externally mixed with sea-salt. Assuming marine organics are internally-mixed with sea-salt provides diverse results with increases and decreases in the concentration of CCN over different parts of the ocean. The sign of the CCN change due to the addition of marine organics to sea-salt aerosol is determined by the relative significance of the increase in mean modal diameter due to addition of mass, and the decrease in particle hygroscopicity due to compositional changes in marine aerosol. Based on emerging evidence for increased CCN concentration over biologically active surface ocean areas/periods, our study suggests that treatment of sea spray in global climate models (GCMs) as an internal mixture of marine organic aerosols and sea-salt will likely lead to an underestimation in CCN number concentration. |
format |
Other Non-Article Part of Journal/Newspaper |
author |
Meskhidze, N. Xu, J. Gantt, B. Zhang, Y. Nenes, A. Ghan, S. J. Liu, Xiaohong Easter, R. Zaveri, R. |
author_facet |
Meskhidze, N. Xu, J. Gantt, B. Zhang, Y. Nenes, A. Ghan, S. J. Liu, Xiaohong Easter, R. Zaveri, R. |
author_sort |
Meskhidze, N. |
title |
Global Distribution and Climate Forcing of Marine Organic Aerosol: 1. Model Improvements and Evaluation |
title_short |
Global Distribution and Climate Forcing of Marine Organic Aerosol: 1. Model Improvements and Evaluation |
title_full |
Global Distribution and Climate Forcing of Marine Organic Aerosol: 1. Model Improvements and Evaluation |
title_fullStr |
Global Distribution and Climate Forcing of Marine Organic Aerosol: 1. Model Improvements and Evaluation |
title_full_unstemmed |
Global Distribution and Climate Forcing of Marine Organic Aerosol: 1. Model Improvements and Evaluation |
title_sort |
global distribution and climate forcing of marine organic aerosol: 1. model improvements and evaluation |
publisher |
University of Wyoming. Libraries |
publishDate |
2011 |
url |
https://hdl.handle.net/20.500.11919/698 https://doi.org/10.5194/acp-11-11689-2011 |
geographic |
Pacific Southern Ocean |
geographic_facet |
Pacific Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Atmospheric Science Faculty Publications |
op_relation |
Faculty Publications - Atmospheric Science https://hdl.handle.net/20.500.11919/698 doi:10.5194/acp-11-11689-2011 |
op_rights |
http://creativecommons.org/licenses/by/3.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/20.500.11919/698 https://doi.org/10.5194/acp-11-11689-2011 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
11 |
container_issue |
22 |
container_start_page |
11689 |
op_container_end_page |
11705 |
_version_ |
1766207047102103552 |