http://bolin.su.se/data/oden-ascos-2008-bubble-size-1 Sarah Norris Bolin Centre Database 2018 Datafile Marine Observations ASCOS Oceanography High Arctic Arctic boundary layer Arctic clouds Ocean Bubble Biogenic aerosols Earth science > Atmosphere Michael Tjernström 2018-10-16T14:24:39+00:00 English 1 None This file contains the standard bubble spectra as matlab structure. A 2 minute averaged spectra was recorded every 15 minutes while the open lead site was manned. The time stamp is for the start of the two minute averging period.</p> <p>Instrument: The Mini-Bubble measuring system (owned by Gerrit de Leeuw, Helsinki). It provides 20 size bins between 30 and 1500micrometer diameter.</p> <p>The fields are:<br /> dNdD : [121x20] each two minute bubble spectra in dN/dD format (units micrometer per m^3)<br /> date_vector : [121x6] date and time in matlab vector format<br /> date_serial : [121x1] date and time in matlab serial format<br /> mean_diameter : [20x1] mean diamter of each bubble bin size<br /> DOY : [121x1] day of year</p> <p>Note the spectra have been quality controlled for bad data.</p> <p>Contact: <a href="mailto:snorris@env.leeds.ac.uk">Sarah Norris</a></p> 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.<p>Original address: <a href="http://www.ascos.se/index.php?q=node/264">http://www.ascos.se/index.php?q=node/264</a><br> </p> <p> Files:<br> <a href="/data/ascos/files/Bubble.zip">Bubble.zip</a> (11 kB)<br> </p>