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Submicrometre aerosol emissions from sea spray and road traffic
Stockholm University, Faculty of Science, Department of Meteorology.
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The uncertainty of the climate and health effects of aerosols is still large, one important reason being lack of knowledge of the primary emissions. This thesis combines laboratory and field experiments, and process modelling in an effort to better quantify the submicrometre aerosol emissions and to understand some of the processes in the atmosphere.

A parameterisation was derived for the source flux of sea salt particles (particles m-2 s-1) in the size range 0.02-2.8 µm dry diameter (Dp), it is the first parameterisation to almost cover two full decades of the submicrometre sea salt aerosol production, and to include the effect of water temperature. This sea salt parameterisation was validated for temperate water in the 0.1-1.1 μm Dp range using in situ size resolved emissions of marine aerosol particles, which were measured with the eddy covariance (EC) method. For periods sampled air was heated to 300ºC in order to evaporate semi-volatile organics and isolate the sea salt fraction. Comparisons with the total aerosol emissions suggest that in these emissions organic carbon and sea salt are internally mixed in the same particles. Finally an aerosol dynamics model was modified for marine conditions. In the model parameterised emissions of sea salt was included together with aerosol dynamics, chemistry and clouds representative for the marine boundary layer. The sea salt emissions are together with secondary sulphate, and cloud processing able to reproduce a typical marine aerosol size distribution and cloud condensation nuclei population.

Measurements with the EC method of the road traffic related aerosol source number flux for Dp>0.011 µm show that the major part of the aerosol fluxes is due to road traffic emissions. Both an emission factor for the whole fleet mix in Stockholm (1.4x1014 vehicle-1 km-1) and separate emission factors for light- and heavy-duty vehicles (HDV) were deduced. The result shows that during weekdays 70-80% of the emissions come from HDV.

Place, publisher, year, edition, pages
Stockholm: Meteorologiska institutionen (MISU) , 2007. , 24 p.
Keyword [en]
Eddy covariance method, aerosol emissions, submicrometre sea salt parameterisation, primary marine organic aerosols, sea spray, road traffic emission factors, air-sea exchange, aerosol dynamics model, internal aerosol mixing, combustion aerosols
National Category
Meteorology and Atmospheric Sciences
Research subject
Atmospheric Sciences
Identifiers
URN: urn:nbn:se:su:diva-7006ISBN: 978-91-7155-480-2 (print)OAI: oai:DiVA.org:su-7006DiVA: diva2:197462
Public defence
2007-09-14, Nordenskiöldsalen, Geovetenskapens hus, Svante Arrhenius väg 8 C, Stockholm, 10:00
Opponent
Supervisors
Available from: 2007-08-23 Created: 2007-08-20Bibliographically approved
List of papers
1. Laboratory simulations and parameterization of the primary marine aerosol production
Open this publication in new window or tab >>Laboratory simulations and parameterization of the primary marine aerosol production
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2003 In: JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, ISSN 0148-0227, Vol. 108, no D9Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-24406 (URN)
Note
Part of urn:nbn:se:su:diva-7006Available from: 2007-08-23 Created: 2007-08-20Bibliographically approved
2. Eddy covariance measurements and parameterisation of traffic related particle emissions in an urban environment
Open this publication in new window or tab >>Eddy covariance measurements and parameterisation of traffic related particle emissions in an urban environment
2006 In: ATMOSPHERIC CHEMISTRY AND PHYSICS, ISSN 1680-7316, Vol. 6, 769-785 p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-24407 (URN)
Note
Part of urn:nbn:se:su:diva-7006Available from: 2007-08-23 Created: 2007-08-20Bibliographically approved
3. Primary marine aerosol emissions: size resolved eddy covariance measurements with estimates of the sea salt and organic carbon fractions
Open this publication in new window or tab >>Primary marine aerosol emissions: size resolved eddy covariance measurements with estimates of the sea salt and organic carbon fractions
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Manuscript (Other academic)
Identifiers
urn:nbn:se:su:diva-24408 (URN)
Note
Part of urn:nbn:se:su:diva-7006Available from: 2007-08-23 Created: 2007-08-20 Last updated: 2010-01-13Bibliographically approved
4. Are submicrometre sea salt emission parameterisations consistent with observed remote marine aerosol distributions?
Open this publication in new window or tab >>Are submicrometre sea salt emission parameterisations consistent with observed remote marine aerosol distributions?
Manuscript (Other academic)
Identifiers
urn:nbn:se:su:diva-24409 (URN)
Note
Part of urn:nbn:se:su:diva-7006Available from: 2007-08-23 Created: 2007-08-20 Last updated: 2010-01-13Bibliographically approved

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