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In situ laboratory sea spray production during the Marine Aerosol Production 2006 cruise on the northeastern Atlantic Ocean
Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
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2010 (English)In: Journal of Geophysical Research, ISSN 0148-0227, Vol. 115, D06201- p.Article in journal (Refereed) Published
Abstract [en]

Bubbles bursting from whitecaps are considered to be the most effective mechanism for particulate matter to be ejected into the atmosphere from the Earth's oceans. To realistically predict the climate effect of marine aerosols, global climate models require process-based understanding of particle formation from bubble bursting. During a cruise on the highly biologically active waters of the northeastern Atlantic Ocean in the summer of 2006, the submicrometer primary marine aerosol produced by a jet of seawater impinging on a seawater surface was investigated. The produced aerosol size spectra were centered on 200 nm in dry diameter and were conservative in shape throughout the cruise. The aerosol number production was negatively correlated with dissolved oxygen (DO) in the water (r < −0.6 for particles of dry diameter Dp > 200 nm). An increased surfactant concentration as a result of biological activity affecting the oxygen saturation is thought to diminish the particle production. The lack of influence of chlorophyll on aerosol production indicates that hydrocarbons produced directly by the photosynthesis are not essential for sea spray production. The upward mixing of deeper ocean water as a result of higher wind speed appears to affect the aerosol particle production, making wind speed influence aerosol production in more ways than by increasing the amount of whitecaps. The bubble spectra produced by the jet of seawater was representative of breaking waves at open sea, and the particle number production was positively correlated with increasing bubble number concentration with a peak production of 40–50 particles per bubble.

Place, publisher, year, edition, pages
2010. Vol. 115, D06201- p.
National Category
Natural Sciences
URN: urn:nbn:se:su:diva-43537DOI: 10.1029/2009JD012522ISI: 000275857400001OAI: diva2:357700
Available from: 2010-10-19 Created: 2010-10-19 Last updated: 2011-12-05Bibliographically approved
In thesis
1. Primary Marine Aerosol Production: Studies using bubble-bursting experiments
Open this publication in new window or tab >>Primary Marine Aerosol Production: Studies using bubble-bursting experiments
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Aerosol particles affect the Earth’s climate, although their impact is associated with large uncertainties. Primary marine aerosol represents a significant fraction of the global aerosol budget considering the Earth’s 70-percentage coverage by oceans. They are produced when bubbles burst at the ocean surface and can consist of sea salt, organic matter and bacteria. An experimental approach was here used to investigate the primary marine aerosol production from the bubble-bursting mechanism using water from four different geographical locations. The main findings include:

  • Similar and stable aerosol number size distributions at all locations, centered close to 0.2 μm.
  • Largely varying aerosol organic fractions, both with size and location.
  • Clear tendency for increased water temperature to negatively influence the aerosol production.
  • No covariance between surface water chlorophyll α and aerosol production on a 10-minute time scale, although decreased aerosol production was observed at times of elevated phytoplankton activity on longer time scales.
  • Mainly external mixtures of sea salt and organics was observed.
  • A high tendency for colony-forming marine bacteria to use bubble-bursting to reach the atmosphere.
  • A clear diurnal cycle in aerosol production was found for both laboratory produced aerosol and in-situ aerosol fluxes, probably biologically driven.
  • The first near coastal sea spray fluxes with limited fetch and low salinity.

While the primary marine aerosol spectral shape is stable, emission concentration varies with environmental parameters. Above that, the organic fraction of the aerosol varies largely between locations. This shows that observations of primary marine aerosol emissions not necessarily can be applied to large time- or spatial scales.

Place, publisher, year, edition, pages
Stockholm: Department of Applied Environmental Science (ITM), Stockholm University, 2010. 44 p.
sea spray, water temperature, dissolved oxygen, photosynthesis, bacterial emissions, V-TDMA, mixing state, eddy covariance
National Category
Natural Sciences
Research subject
Applied Environmental Science
urn:nbn:se:su:diva-43544 (URN)978-91-7447-159-5 (ISBN)
Public defence
2010-12-01, Nordenskiöldsalen, Geovetenskapens hus, Svante Arrhenius väg 12, Stockholm, 10:00 (English)
At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 2: In press. Paper 3: Manuscript. Paper 4: Manuscript. Available from: 2010-11-09 Created: 2010-10-19 Last updated: 2011-03-16Bibliographically approved

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Hultin, KimNilsson, DouglasKrejci, RadovanMårtensson, Monica
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