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SUMMARY:Quantitative Imaging of Small-Scale Air-Water Interaction Processe
 s in Lab and Field
DTSTART:20140513T161500
DTEND:20140513T171500
DTSTAMP:20260930T202130Z
UID:9b602b78fa32f995bd36f8825570321a23dc2dcb8415cffca157153b
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr Bernd Jaehne\, Heidelberg Collaboratory for Image Processin
 g (HCI) IWR\, Universität Heidelberg\, Germany\nAbstract:\n“On the open
  sea\, the microlayer is almost inaccessible to direct physical measuremen
 ts” [Hasse\, 1997].  Indeed\, classical mass balance techniques\, which
  estimate mean transfer velocities over large spatial and temporal scales\
 , are only suitable for a parametrization of the transfer process with the
  parameters controlling it. Direct insight into the mechanisms of air-wate
 r gas transfer\, however\, is given by techniques that provide a spatio-te
 mporal quantitative imaging of all the parameters that determine the mass 
 exchange process within the microlayer at the water surface. This includes
  the turbulent shear flow\, concentration fields of dissolved gases\, and 
 the shape of the ocean surfaces undulated by wind-driven waves. At higher 
 wind speeds\, when waves are breaking\, it is also required to visualise b
 ubbles and droplets.\nWhile numerical approaches and also all kinds of flo
 w visualization techniques in general have made significant progress in th
 e last years\, progress in quantitative imaging to investigate small-scale
  air-sea interaction processes is still slow\, because imaging techniques 
 are experimentally very demanding even in laboratory facilities. This is b
 ecause the interface is moving\, being deformed by waves and sometimes bre
 aks. Thus the lack of adequate quantitative imaging techniques is one of t
 he major obstacles in gaining a better understanding of the mechanisms of 
 air-sea gas transfer. Most previous investigations were limited to the sim
 pler case of flat free water surfaces and used only various kinds of botto
 m-generated turbulence. This talk gives a survey on imaging techniques for
  short wind-waves\, passive and active thermography to study surface flow\
 , heat and mass transfer at the water surface\, and fluorescence technique
 s for high-resolution imaging of concentration fields in the vicinity of t
 he air-water interface.Short biography:\nBernd Jähne is Physicist and Com
 puter Scientist\, educated at the Universities of Saarbrücken\, Heidelber
 g and Hamburg-Harburg. After a research professorship at the Scripps Insti
 tution of Oceanography (UCSD)\, he occupies a professorship in image proce
 ssing at the Interdisciplinary Center for Scientific Computing (IWR) and t
 he Institute of Environmental Physics of Heidelberg University since 1994.
  Since 2008 he is also coordinating director of the industry on campus pro
 ject Heidelberg Collaboratory for Image Processing (HCI).
LOCATION:GR A3 32 http://plan.epfl.ch/?room=GR%20A3%2032
STATUS:CONFIRMED
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