Land- to lake-terminating transition triggers dynamic thinning of a Bhutanese glacier

Abstract. There have been rapid increases in both the number and expansion of proglacial lakes across High Mountain Asia. However, relationship between glacier dynamics remains unclear Himalayan region. Here we present surface elevation, flow-velocity changes, lake Thorthormi Lugge glaciers Lunana region, Bhutanese Himalaya, during 2000–2018 period using photogrammetry GPS survey data. The lowering rates field Glacier, a lake-terminating glacier, remained approximately constant since 2000. Conversely, there accelerated 2-fold increase thinning rate Glacier 2011, as well considerable speed-up (>150 m a−1). We reveal that formation transition from land- to triggered via positive (compressive) negative (extensional) change emergence velocities. This study provides first evidence dynamic changes are associated with