LeConte Glacier time-lapse photos 2016-2017, Alaska

In 2016-2017 we conducted a field study at LeConte Glacier, Alaska, to study the impacts of subglacial discharge on plume dynamics and submarine melting. As part of that study, eight time-lapse cameras documented the terminus and proglacial fjord of LeConte Glacier, Alaska in order to (i) track iceberg motion, (ii) document changes in glacier terminus position and calving activity, and (iii) estimate seasonal variations in glacier velocities. The camera frame rates varied. Four cameras (UAS1-UAS3, UAS5) took photos of the fjord every one to two minutes for ~10 hrs per day, depending on the season. Three cameras took photos of the glacier every hour (UAS4 and Hunting1-Hunting2). An eighth camera (UAS6) took photos every 15 s during three short field campaigns in 2017; the frame interval of cameras UAS1-UAS3 and UAS5 was also reduced to 15 s during the final field campaign.

2016至2017年，我们在阿拉斯加州利康特冰川（LeConte Glacier）开展实地研究，旨在探究冰下径流（subglacial discharge）对羽状流动力学（plume dynamics）与海底消融（submarine melting）的影响。作为该研究的组成部分，八台定时延时相机对该冰川的冰舌（terminus）与冰前峡湾（proglacial fjord）进行记录，以实现三大目标：（i）追踪冰山运动；（ii）记录冰川冰舌位置变化与冰川崩解活动（calving activity）；（iii）估算冰川流速的季节变化。各相机的拍摄帧率存在差异：其中四台相机（UAS1-UAS3、UAS5）每日拍摄时长约10小时，拍摄间隔为1至2分钟，具体时长依季节而定；三台相机（UAS4、Hunting1-Hunting2）每小时拍摄一次冰川场景；第八台相机（UAS6）则在2017年的三次短期野外作业期间，以15秒的间隔进行拍摄；此外，在最后一次野外作业中，UAS1-UAS3及UAS5的拍摄间隔也被调整为15秒。