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CATEGORIES:Isaac Newton Institute Seminar Series
SUMMARY:Ice melting in salty water: layering and non-monot
 onic dependence on the mean salinity - Detlef Lohs
 e (Universiteit Twente)
DTSTART;TZID=Europe/London:20240117T111500
DTEND;TZID=Europe/London:20240117T120000
UID:TALK208489AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/208489
DESCRIPTION:The presence of salt in ocean water strongly affec
 ts the melt rate and the shape evolution of ice\, 
 both of utmost relevance in geophysical and ocean 
 flow and thus for the climate. To get a better qua
 ntitative understanding of the physical mechanics 
 at play in ice melting in salty water\, we numeric
 ally investigate the lateral melting of an ice blo
 ck in stably stratified saline water\, using a rea
 listic\, nonlinear equation of state. The developi
 ng ice shape from our numerical results shows good
  agreement with the famous experiments and theory 
 from Huppert & Turner from their JFM in 1980. Furt
 hermore\, we find that the melt rate of ice depend
 s non-monotonically on the mean ambient salinity: 
 It first decreases for increasing salt concentrati
 on until a local minimum is attained\, and then in
 creases again. This non-monotonic behavior of the 
 ice melt rate is due to the competition among sali
 nity-driven buoyancy\, temperature-driven buoyancy
 \, and salinity-induced stratification. We develop
  a theoretical model based on the energy balance w
 hich gives a prediction of the salt concentration 
 for which the melt rate is minimal\, and is consis
 tent with our data. Our findings give insight into
  the interplay between phase transitions and doubl
 e-diffusive convective flows. The talk will also e
 laborate on other melting phenomena.
LOCATION:Seminar Room 1\, Newton Institute
CONTACT:
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