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SUMMARY:Ice melt driven by the ocean - Two process studies on the physics 
 of ice-ocean interactions based on observations from NE Greenland and the 
 central Arctic Ocean - Dr Janin Schaffer\, Alfred Wegener Institute\, Germ
 any
DTSTART:20200723T100000Z
DTEND:20200723T110000Z
UID:TALK149962@talks.cam.ac.uk
CONTACT:Louis Couston
DESCRIPTION:Part I: Rapid supply of warm Atlantic waters below Greenland's
  largest glacier tongue\n\nMass loss from the Greenland ice sheet has incr
 eased over the past two decades\, currently accounting for 25% of global s
 ea level rise. This is due to increased surface melt driven by atmospheric
  warming and the retreat and acceleration of marine terminating glaciers f
 orced by oceanic heat transport. We use ship-based profiles\, bathymetric 
 data and moored time series from 2016 to 2017 of temperature\, salinity an
 d water velocity collected in front of the floating tongue of the 79 North
  Glacier in Northeast Greenland. These observations indicate that a year-r
 ound bottom-intensified inflow of warm Atlantic Water through a narrow cha
 nnel is constrained by a sill. The associated heat transport leads to a me
 an melt rate of 10.4 ± 3.1 m yr–1 on the bottom of the floating glacier
  tongue. We conclude that near-glacier\, sill-controlled ocean heat transp
 ort plays a crucial role for glacier stability.\n\nPart II: Trapped in the
  Arctic ice – First results from the MOSAiC expedition (leg 3)\n\nMOSAiC
  (Multidisciplinary drifting Observatory for the Study of Arctic Climate) 
 aims at a breakthrough in understanding the Arctic climate system and in i
 ts representation in global climate models. The backbone of MOSAiC is the 
 year-round operation of RV Polarstern\, drifting since October 2019 with t
 he sea ice across the central Arctic. A distributed regional network of ob
 servational sites has been set up on the sea ice in an area of up to ~40 k
 m distance from RV Polarstern. Team OCEAN aims at a better understanding o
 f ocean boundary-layer mixing processes and heat fluxes from the warm Atla
 ntic water across the halocline. On leg 3\, all teams carried out measurem
 ents during the transition from 24-hours darkness to 24-hours light. Furth
 ermore\, we sampled in newly formed leads and ridges\, during the passage 
 of storms\, and captured the onset of the melting season - under challengi
 ng work conditions.
LOCATION:British Antarctic Survey\, Zoom
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