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CATEGORIES:Scott Polar Research Institute - Polar Physical Sc
 iences Seminar
SUMMARY:Insights from mapping Greenland’s supraglacial lak
 es at unprecedented temporal and spatial scales - 
 Dr. James Lea\, University of Liverpool
DTSTART;TZID=Europe/London:20200521T160000
DTEND;TZID=Europe/London:20200521T170000
UID:TALK139294AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/139294
DESCRIPTION:SEMINAR CANCELLED DUE TO COVID-19 OUTBREAK\n\nSupr
 aglacial lakes represent a fundamental component o
 f the surface hydrology of the Greenland ice sheet
 . Understanding the relationship of these lakes wi
 th ice sheet surface mass balance\, geometry\, loc
 ation\, and how this has changed through time also
  informs how their drainage can impact ice sheet s
 ubglacial hydrology and seasonal flow dynamics. Ho
 wever\, previous studies of supraglacial lakes hav
 e been limited in spatial and/or temporal scale re
 lative to the entire ice sheet.\n\nHere we use the
  entire MODIS Terra archive within Google Earth En
 gine to derive maps of supraglacial lake cover eve
 ry day of every melt season for the last 20 years 
 for the entire Greenland ice sheet. Through genera
 ting annual composites of where lakes are observed
 \, we identify that the frequency of lakes has on 
 average increased by 27% from 2000-2019. Lakes are
  observed to be occurring at higher elevations in 
 all sectors of the ice sheet for 2010-2019 compare
 d to 2000-2009. Output from the regional climate m
 odel MAR suggests that in the most recent decade h
 igher numbers of lakes are being formed for a give
 n volume of runoff.\n\nThe observation of lakes th
 at can form more easily\, further inland and at hi
 gher elevations have significant implications for 
 future surface mass balance\, and potentially the 
 dynamics of inland regions of the Greenland ice sh
 eet.
LOCATION:Scott Polar Research Institute\, main lecture thea
 tre
CONTACT:Frazer Christie
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