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SUMMARY:Darker\, wetter and faster: recent and projected trends of mass ba
 lance over the Greenland ice sheet and linkages to surface and sub-surface
  processes - Dr Marco Tedesco\, Department of Earth and Atmospheric Scienc
 es\, City College of New York
DTSTART:20120328T120000Z
DTEND:20120328T124500Z
UID:TALK37276@talks.cam.ac.uk
CONTACT:Steven Palmer
DESCRIPTION:Over the recent years\, runoff and melting over Greenland have
  been increasing\, confirming a long-term statistically significant trend 
 and suggesting negative surface mass balance in the close future. Moreover
 \, many glaciers along the edges have been retreating and thinning at high
 er elevations. New records were set in 2010 and close-to-record in 2011 fo
 r surface melt and albedo\, runoff\, the number of days when bare ice was 
 exposed and surface mass balance of the Greenland ice  sheet\, especially 
 over its west and southwest regions. Analyzing the causes and implications
  of these recently observed extremes and records is crucial to properly pr
 oject the behavior of the Greenland ice sheet in future climate scenarios.
  In this talk I analyze recent and projected trends of surface mass balanc
 e over the Greenland ice sheet. I focus on some of the major causes and dr
 ivers of these events through a combination of remote sensing tools\, fiel
 dwork data and outputs of a regional climate model. In particular\, I will
  show results from our fieldwork expeditions focusing on albedo changes\, 
 I will discuss the impact of supraglacial lakes on ice flow velocities and
  ice sheet dynamics\, the role of accumulation and I will assess the impac
 t of the biological activity on Greenlands ice.
LOCATION:Scott Polar Research Institute\, main lecture theatre
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