Time series of Lagrangian basal melt rates at 79°N Glacier since 2016 ...

• Main Authors: Zeising, Ole, Steinhage, Daniel, Neckel, Niklas, Humbert, Angelika
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2024
• Subjects: 79°N Glacier; ApRES; Basal melt rates; Nioghalvfjerdsfjorden Glacier; Northeast Greenland; Autonomous phase-sensitive radio-echo sounder; GL-Land_2022_CalvDis; GL-Land_2023_CalvDis; GL-Land_2017_iGRIFF; GL-Land_2018_iGRIFF; AWI Arctic Land Expedition; Greenland - Ice Sheet/Ocean Interaction From process understanding to an analysis of the regional system GROCE; Arctic; glacier; Greenland; Ice Sheet; Nioghalvfjerdsfjorden
• Online Access: https://dx.doi.org/10.1594/pangaea.928903; https://doi.pangaea.de/10.1594/PANGAEA.928903

Estimated time series of Lagrangian basal melt rates from an autonomous phase-sensitive radar (ApRES) measurement at 79°N Glacier (Nioghalvfjerdsfjorden Glacier) in northeast Greenland since 2016. Measurement intervals ranged from one to six hours. Basal melt rates are based on the quantification of the ablation, ice deformation due to strain, and the change in ice thickness. All quantities can be estimated from vertical displacements of internal and basal returns of the transmitted signal. We divided the first echogram into 6 m long segments with 5 m overlap starting at a depth of 20 m. For each segment, we derived displacements from complex cross-correlation of the phase of all pairwise time-consecutive measurements. Afterward, we calculated the daily mean values of the displacements. We used the time-mean vertical displacement of internal reflectors to calculate the vertical strain profile. Here only those segments between 20 m below the surface and 20 m above the basal return at the last measurement were ... : Data were measured in the field by Angelika Humbert, Niklas Neckel, Daniel Steinhage and Ole Zeising. Data processing was done by Ole Zeising, data analysis by Ole Zeising and Angelika Humbert. This dataset has been planned by Angelika Humbert as part of the iGRIFF expeditions and as contribution to GROCE. If you have questions, please contact Ole Zeising ([e-mail]) or co-authors.This collection contains datasets since 2016, however, new datasets mights still be added. ...