Bubble sizes in the water measured during the high-Arctic ASCOS expedition 2008
Sarah Norris
Upper ocean gas bubbles generate airborne droplets when they burst at the surface, either "film droplets", from remnants of the surface of a bubble, or "jet droplets", formed by a jet of liquid that shoots upward from the bottom of the bubble as its upper rim breaks the surface. When droplets evaporate, insoluble material from the upper ocean contained inside the droplets will remain airborne as aerosol particles. This is a well-known mechanism whereby, for example, breaking wind waves generate sea-salt aerosols. In the Arctic summer, with short fetch over open water and relatively low wind speeds, it is not obvious that bubbles will form. Hence, during ASCOS we deployed a system to measure number and size of bubbles in the upper water column.
MarineObservationsASCOSOceanographyHigh ArcticArctic boundary layerArctic cloudsOceanBubbleBiogenic aerosols
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Citation
References
Tjernström, M. et al. 2014. The Arctic Summer Cloud Ocean Study (ASCOS): overview and experimental design. Atmospheric Chemistry and Physics, 14, 2823–2869. https://doi.org/10.5194/acp-14-2823-2014
Data description
dNdD : [121x20] each two minute bubble spectra in dN/dD format (units micrometer per m^3)
date_vector : [121x6] date and time in matlab vector format
date_serial : [121x1] date and time in matlab serial format
mean_diameter : [20x1] mean diamter of each bubble bin size
DOY : [121x1] day of year Note the spectra have been quality controlled for bad data. Contact: [Sarah Norris](mailto:snorris@env.leeds.ac.uk)
Comments
Gas bubbles formed in the upper ocean will generate droplets in the air above the surface when they burst. Two types of droplets are generated; so-called film droplets which is the remnants of the inner surface of the bubble, and so-called jet droplets which are formed by the (due to the pressure difference) jet of liquid that shoots upward from the bottom of the bubble as its upper rim breaks the surface. Both types of droplets may evaporate and what soluble or insoluble material that might be in the droplets, emanating from the upper ocean surface, will remain airborne as an aerosol. This is a well-known mechanism whereby, for example. Breaking wind waves generate so-called sea-salt aerosols. In the Arctic, with short fetch over open water, it is not obvious that bubbles will form; hence during ASCOS we deployed in the upper water column a system to measure number and size of bubbles.Original address: http://www.ascos.se/index.php?q=node/264
Files:
Bubble.zip (11 kB)
Project
Arctic Summer Cloud-Ocean Study 2008 (Ascos)
Publisher
Bolin Centre Database
First name
Michael
Last name or organisation
Tjernström
Email address
Address
Department of Meteorology; Stockholm University
Postal code
SE-106 91 Stockholm
City
Stockholm
Country
Sweden
GCMD science keyword
Earth science > Atmosphere
GCMD location
Ocean > Arctic Ocean
Dataset language
English
Begin date
2008-08-13
End date
2008-09-01