Grounding Line Location using Echograms - CReSIS

Q10) By plotting the coordinates from the x-axis of the echograms, it is possible to determine the flight path of the
plane. Also, the distance increases from the first set of coordinates to the last set, making it possible to determine flight
direction from simply plotting those two points.
Q11) Answers will vary. Accept all reasonable answers where the student accurately describes the results of their
grounding line estimations compared to the accepted location found by scientists.
Q12) Since the location of the grounding line is a rough indication of the health of a glacier, collecting this data over
multiple years will allow scientists to monitor how a glacier is behaving over time. The results of this data can also lead
to improved models to predict future changes in sea level.
Q13) The grounding line position appears to have retreated slightly since 2007, and also it has smoothed out. The line
still appears to the NW of the 2003 line. (Remember, these are estimates of grounding line position and are only based
on two samples for each year)
Figure 6 - Estimate grounding location; 2003 in green, 2007 in blue, and 2011 in orange
Q14) See Figure 7