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SUMMARY:Insights from mapping Greenland’s supraglacial lakes at unpreced
 ented temporal and spatial scales - Dr. James Lea\, University of Liverpoo
 l
DTSTART:20200521T150000Z
DTEND:20200521T160000Z
UID:TALK139294@talks.cam.ac.uk
CONTACT:Frazer Christie
DESCRIPTION:SEMINAR CANCELLED DUE TO COVID-19 OUTBREAK\n\nSupraglacial lak
 es represent a fundamental component of the surface hydrology of the Green
 land ice sheet. Understanding the relationship of these lakes with ice she
 et surface mass balance\, geometry\, location\, and how this has changed t
 hrough time also informs how their drainage can impact ice sheet subglacia
 l hydrology and seasonal flow dynamics. However\, previous studies of supr
 aglacial lakes have been limited in spatial and/or temporal scale relative
  to the entire ice sheet.\n\nHere we use the entire MODIS Terra archive wi
 thin Google Earth Engine to derive maps of supraglacial lake cover every d
 ay of every melt season for the last 20 years for the entire Greenland ice
  sheet. Through generating annual composites of where lakes are observed\,
  we identify that the frequency of lakes has on average increased by 27% f
 rom 2000-2019. Lakes are observed to be occurring at higher elevations in 
 all sectors of the ice sheet for 2010-2019 compared to 2000-2009. Output f
 rom the regional climate model MAR suggests that in the most recent decade
  higher numbers of lakes are being formed for a given volume of runoff.\n\
 nThe observation of lakes that can form more easily\, further inland and a
 t higher elevations have significant implications for future surface mass 
 balance\, and potentially the dynamics of inland regions of the Greenland 
 ice sheet.
LOCATION:Scott Polar Research Institute\, main lecture theatre
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