Update of annual calving front lines for 47 marine terminating outlet glaciers in Greenland (1999–2018)
Update of annual calving front lines for 47 marine terminating outlet glaciers in Greenland (1999–2018)
复制标题
格陵兰岛 47 个海洋终止出口冰川的年度崩解前线更新（1999-2018 年）
DOI：
10.34194/geusb-201943-02-02
复制
发表时间：
2019
影响因子：
--
通讯作者：
B. Vandecrux
中科院分区：
文献类型：
--
作者：
J. K. Andersen;R. Fausto;K. Hansen;J. Box;S. Andersen;A. Ahlstrøm;D. As;M. Citterio;W. Colgan;N. Karlsson;K. Kjeldsen;N. Korsgaard;S. Larsen;K. Mankoff;Allan Ø. Pedersen;Christopher L. Shields;A. Solgaard;B. Vandecrux
由于表面融化增加，格陵兰冰盖一直在失去质量(Khan等人)。2015年；van den Broeke等人。以及从海洋末端出口冰川排放冰(van den Broeke等人)。2009年；Box等人。2018年)。海洋终点出口冰川流入海洋，在那里它们通过冰山崩解等方式失去质量。目前，格陵兰冰盖的质量损失是北极地区导致全球海平面上升的最大因素(van den Broeke等人)。2009,2017；Box等人。2018年)。因此，监测格陵兰冰盖的变化对于为决策者提供可靠数据至关重要。
人们一致认为，近几十年来，大多数海洋末端出口冰川已经消退，崩解率的增加是对最近大气和海洋变暖的反应(例如Box等人)。2018年；穆恩等人。2018年)。动态质量损失率由冰川崩解锋(即其末端)位置、冰层厚度和冰流变化决定。海洋温度和峡湾环流也通过融化水线以下的冰川，使与水接触的冰变薄，从而影响崩解锋的稳定性(Moon等人)。2014年)。因此，崩解前沿位置的变化是监测冰盖上游区域动态行为的一个重要指标，这进一步受到当地地形特征和支撑效应的影响(Rignot&Kanagaratnam，2006；Nick等人)。2009年)。
格陵兰冰盖监测方案(PROMICE)致力于监测格陵兰冰盖质量预算的变化，包括监测海洋末端出口冰川的崩解前线。在这里，我们提供了1999年至2018年格陵兰47个海洋末端出口冰川融化季末崩解前沿的年度测量数据的最新集合。我们还给出了一个数据集的示例应用，在该数据集中，我们估计了这组冰川自1999年以来的面积变化。格陵兰崩解前线是从陆地卫星、Aster和Sentinel-2获得的光学卫星图像中测量的(表1)。PROMICE解冻前产品以ESRI shapefile的形式免费下载。
The Greenland ice sheet has been losing mass in response to increased surface melting (Khan et al. 2015; van den Broeke et al. 2017) as well as discharge of ice from marine terminating outlet glaciers (van den Broeke et al. 2009; Box et al. 2018). Marine terminating outlet glaciers flow to the ocean where they lose mass by e.g. iceberg calving. Currently, the mass loss from the Greenland ice sheet is the largest Arctic contributor to global sea-level rise (van den Broeke et al. 2009, 2017; Box et al. 2018). Therefore, monitoring changes in the Greenland ice sheet is essential to provide policy makers with reliable data.
There is a consensus that most marine terminating outlet glaciers have retreated in recent decades, and that the increased calving rates are a response to recent atmospheric and oceanic warming (e.g. Box et al. 2018; Moon et al. 2018). The rate of dynamic mass loss is determined by changes of the glacier calving front (i.e. its terminus) position, ice thickness and changes in ice flow. Ocean temperature and fjord circulation also influence the calving front stability by melting the glacier below the water line, thinning the ice that is in contact with water (Moon et al. 2014). Change in calving front position is therefore an important indicator for monitoring the dynamic behaviour of the upstream area of the ice sheet, which is further modulated by local topographic features and buttressing effects (Rignot & Kanagaratnam 2006; Nick et al. 2009).
The Programme for Monitoring of the Greenland Ice Sheet (PROMICE) is dedicated to monitoring changes in the mass budget of the Greenland ice sheet, including monitoring of the calving front lines of marine terminating outlet glaciers. Here, we present an updated collection of annual measurements of end-of-melt-season calving front lines for 47 marine terminating outlet glaciers in Greenland between 1999 and 2018. We also present an example application of the data set, in which we estimate area changes for this group of glaciers since 1999. The Greenland calving front lines were measured from optical satellite imagery obtained from Landsat, Aster, and Sentinel-2 (Table 1). The PROMICE calving front product is freely available for download as ESRI shapefiles.
影响因子：
18.3
作者：
Khazendar, Ala;Fenty, Ian G.;Willis, Josh
通讯作者：
Willis, Josh