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SUMMARY:Observing Iceberg Melt in a Greenland Fjord - Margaret Lindeman\, 
 Scripps Institution of Oceanography
DTSTART:20200923T150000Z
DTEND:20200923T160000Z
UID:TALK150718@talks.cam.ac.uk
CONTACT:Dr Irena Vankova
DESCRIPTION:As much as half of the freshwater flux from the Greenland Ice 
 Sheet enters the ocean through iceberg calving. Up to 50% of iceberg mass 
 is expected to melt within glacial fjords\, where it influences the circul
 ation and properties of water masses in contact with the glacier terminus\
 , as well as the characteristics of glacially-modified water exported to t
 he North Atlantic. Observations of iceberg melt in fjords are needed to ev
 aluate predictions of spatial and temporal meltwater distribution under a 
 range of environmental conditions\, in order to determine its impacts on t
 he ocean.\n\nWe conducted repeat oceanographic surveys of 6 icebergs in Se
 rmilik Fjord\, southeast Greenland\, during August 2018 to identify enviro
 nmental factors driving the distribution of iceberg melt\, including ocean
  thermal forcing and stratification\, relative velocity between each icebe
 rg and local ocean currents\, and iceberg geometry. Our surveys include ne
 ar-iceberg properties sampled using a remotely-operated surface vehicle (J
 etyak) equipped with an ADCP (Acoustic Doppler Current Profiler) and tempe
 rature and salinity sensors\, as well as full-depth temperature and salini
 ty profiles. Iceberg depth and shape were measured using multibeam sonar a
 nd aerial imagery\, and some iceberg locations were tracked with GPS. We c
 ompare our findings to numerical and laboratory simulations\, and discuss 
 their implications for iceberg melt distribution in the context of a decad
 e-long observational record of ocean variability in Sermilik Fjord.
LOCATION:British Antarctic Survey\, Zoom
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