02194nas a2200265   4500008004100000022001300041245008000054210007000134300001200204490000700216520131900223653001201542653002101554653002201575653003701597653002301634100001901657700002101676700002401697700002001721700002801741700002601769700001501795856011801810       2019                        eng d  a0022143000aNon-linear glacier response to calving events, Jakobshavn Isbræ, Greenland0 aNonlinear glacier response to calving events Jakobshavn Isbræ Gr  a39–540 v653 aJakobshavn Isbræ, a tidewater glacier that produces some of Greenland's largest icebergs and highest speeds, reached record-high flow rates in 2012 (Joughin and others, 2014). We use terrestrial radar interferometric observations from August 2012 to characterize the events that led to record-high flow. We find that the highest speeds occurred in response to a small calving retreat, while several larger calving events produced negligible changes in glacier speed. This non-linear response to calving events suggests the terminus was close to flotation and therefore highly sensitive to terminus position. Our observations indicate that a glacier's response to calving is a consequence of two competing feedbacks: (1) an increase in strain rates that leads to dynamic thinning and faster flow, thereby promoting destabilization, and (2) an increase in flow rates that advects thick ice toward the terminus and promotes restabilization. The competition between these feedbacks depends on temporal and spatial variations in the glacier's proximity to flotation. This study highlights the importance of dynamic thinning and advective processes on tidewater glacier stability, and further suggests the latter may be limiting the current retreat due to the thick ice that occupies Jakobshavn Isbræ's retrograde bed.10acalving10adynamic thinning10aJakobshavn Isbræ10aterrestrial radar interferometry10atidewater glaciers1 aCassotto, Ryan1 aFahnestock, Mark1 aAmundson, Jason, M.1 aTruffer, Martin1 aBoettcher, Margaret, S.1 aDe La Peña, Santiago1 aHowat, Ian  uhttps://glaciers.gi.alaska.edu/content/non-linear-glacier-response-calving-events-jakobshavn-isbr%C3%A6-greenland