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SUMMARY:Icebergs\, meltwater and the overturning circulation during Marine
  Isotope Stage 6 - Mattias Green (Bangor University)
DTSTART:20110209T110000Z
DTEND:20110209T120000Z
UID:TALK27525@talks.cam.ac.uk
CONTACT:Povl Abrahamsen
DESCRIPTION:Scour marks on the Lomonosov Ridge in the central Arctic Basin
  imply that icebergs with drafts exceeding 850 m once existed in the Arcti
 c\, and the most likely source of such bergs is the disintegration of the 
 Barents Ice Sheet during Marine Isotope Stage 6 (MIS 6\; 140 ka BP). \nHer
 e\, an intermediate complexity climate model is used to simulate the colla
 pse of the Barents Ice Sheet during MIS 6 to investigate the drift pattern
 s of icebergs originating from the Barents ice sheet\, and what the implic
 ations of the associated freshwater input were for the ocean circulation. 
 The simulations show that deep-draft bergs seeded from the Franz Victoria 
 Trough could indeed have reached the Lomonosov Ridge\, whereas other bergs
  crossed the Yermak Plateau and exited through the Fram Strait. This work 
 is consistent with previous speculation regarding the origin of the iceber
 gs\, but suggests an origin from the western\, rather than eastern\, major
  ice stream of the Barents ice sheet. \nFurthermore\, the collapse of the 
 Barents Ice Sheet had a significant impact on the ocean circulation. Fresh
 water fluxes of 0.15 Sv and iceberg surges of 0.1 Sv applied over 500 year
 s trigger significant changes in the global overturning circulation\, part
 icularly in the North Pacific Ocean\, where there is strengthening of the 
 overturning at the expense of that in the North Atlantic\, and increases i
 n air and sea surface temperatures. These results highlight the importance
  of simulating not only the correct flux but also the form of the freshwat
 er input from ice-sheet collapses appropriately.
LOCATION:British Antarctic Survey\, Room 330B
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