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SUMMARY:Theoretical framework for the emergent floe size distribution: the
  case for log-normality - Fabien Montiel (University of Otago)
DTSTART:20220922T103000Z
DTEND:20220922T110000Z
UID:TALK178319@talks.cam.ac.uk
DESCRIPTION:Despite a recent resurgence of observational studies attemptin
 g to quantify the ice-induced attenuation of ocean waves in polar oceans\,
  the physical processes governing this wave attenuation phenomenon are sti
 ll poorly understood. Most analyses have attempted to relate the spatial r
 ate of wave attenuation to wave frequency\, but have not considered how th
 is relationship depends on ice\, wave and atmospheric conditions. An in-de
 pth analysis of the wave-buoy data collected during the 2017 PIPERS progra
 mme in the Ross Sea is conducted. Standard techniques are used to estimate
  the spatial rate of wave attenuation $\\alpha$ and the influence of a num
 ber of potential physical drivers on its dependence on wave period $T$ is 
 investigated. A power-law is shown to consistently describe the $&alpha\;(
 T)$ relationship\, in line with other recent analyses. The two parameters 
 describing this relationship are found to depend significantly on sea ice 
 concentration\, mean wave period and wind direction\, however. Looking at 
 cross-correlations between these physical drivers\, three regimes of ice-i
 nduced wave attenuation are identified\, which characterise different ice\
 , wave and wind conditions\, and very possibly different processes causing
  this observed attenuation. This analysis suggests that parametrisations o
 f ice-induced wave decay in spectral wave models should be piecewise\, so 
 as to include their dependence on local ice\, wave and wind conditions.
LOCATION:Seminar Room 1\, Newton Institute
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