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SUMMARY:The Impact of Glacio-Mediated Sea Level Changes on the Tides in th
 e Past and Future - Sophie-Berenice Wilmes\, Bangor University
DTSTART:20150204T110000Z
DTEND:20150204T120000Z
UID:TALK55000@talks.cam.ac.uk
CONTACT:Dr Dan Jones
DESCRIPTION:Recent studies have highlighted an accelerated ice loss from g
 laciers draining the West Antarctic and Greenland Ice Sheets. In West Anta
 rctica a marine ice sheet destabilization may already be underway\, possib
 ly leading to a collapse of the ice sheet in the coming centuries. A full 
 melting of either ice sheet would not result in a globally uniform sea lev
 el increase\, but in spatially heterogeneous sea level changes due to chan
 ges in gravitational attraction\, the Earth’s rotation and crustal unloa
 ding. \nDuring the Last Glacial Maximum (LGM\; 18–22 kyr BP) sea level w
 as on average 120 m lower than today due to large amounts of water being l
 ocked up in the Northern Hemisphere ice sheets. \nBecause ocean tides are 
 largely controlled by the bathymetry these sea level changes are expected 
 to impact on the dynamics of the global tides. Here\, we investigate how t
 he tides\, and the associated tidal energy dissipation\, respond to the la
 rge\, non-uniform sea level changes the changes in ice sheet configuration
  would induce. We show that large changes in amplitude for the principle s
 emi-diurnal constituent M2 would occur across the globe both in the future
  and the past scenarios. Furthermore\, large changes in tidal energy dissi
 pation take place both in the deep ocean and in most tidally dominated she
 lf seas\, with potential consequences for ocean mixing\, biogeochemistry\,
  and tidal power extraction\, and in the case of the LGM also for ocean ci
 rculation.\nOur results replicate previously reported enhancements in diss
 ipation and amplitudes for M2 for the LGM and provide a detailed picture o
 f the large global changes in M2 tidal dynamics occurring over the deglaci
 ation period. We show that for M2 the grounding line location has a large 
 influence on global tides. For K1 the changes over this period are mainly 
 regional and not are impacted by grounding line shifts. \nOur work shows t
 hat glacio-mediated sea level changes may have had profound impacts on the
  tides in the past and are expected to do so in the future.  \n
LOCATION:British Antarctic Survey\, Room 307
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