Contributors: Krieger, Lukas, Floricioiu, Dana, Neckel, Niklas

Date: 2019-11-15

... Abstract: The drainage divides of ice sheets separate the overall glaciated area into multiple sectors. These drainage basins are essential for partitioning mass changes of the ice sheet, as they specify the area over which basin specific measurements are integrated. The delineation of drainage basins on ice sheets is challenging due to their gentle slopes accompanied by local terrain disturbances and complex patterns of ice movement. Until now, in Greenland the basins have been mostly delineated along the major ice divides, which results in large drainage sectors containing multiple outlet glaciers. However, when focusing on measuring glaciological parameters of individual outlet glaciers, more detailed drainage basin delineations are needed. Here we present for the first time a detailed and fully traceable approach that combines ice sheet wide velocity measurements by Sentinel-1 and the high resolution TanDEM-X global DEM to derive individual glacier drainage basins. We delineated catchments for the Northeast Greenland Ice Sheet with a modified watershed algorithm and present results for 31 drainage basins. Even though validation of drainage basins remains a difficult task, we estimated basin probabilities from Monte-Carlo experiments and applied the method to a variety of different ice velocity and DEM datasets finding discrepancies of up to 16% in the extent of catchment areas. The proposed approach has the potential to produce drainage areas for the entirety of the Greenland and Antarctic ice sheets. Category: geoscientificInformation Source: Supplement to: Krieger, Lukas; Floricioiu, Dana; Neckel, Niklas (accepted): Drainage basin delineation for outlet glaciers of Northeast Greenland based on Sentinel-1 ice velocities and TanDEM-X elevations. Remote Sensing Supplemental Information: Not Availble Coverage: EVENT LABEL: * LATITUDE: 80.130000 * LONGITUDE: -19.450000

Contributors: Boebel, Olaf, Rohardt, Gerd

Date: 2019-11-15

... Abstract: Not Available Category: geoscientificInformation Source: Not Available Supplemental Information: Not Availble Coverage: EVENT LABEL: * LATITUDE START: -33.906800 * LONGITUDE START: 18.433700 * LATITUDE END: -53.144700 * LONGITUDE END: -70.909100 * DATE/TIME START: 2018-12-15T00:00:00 * DATE/TIME END: 2019-02-07T00:00:00 * CAMPAIGN: PS117 * BASIS: Polarstern * DEVICE: Underway cruise track measurements

Contributors: Dorschel, Boris, Rohardt, Gerd

Date: 2019-11-15

... Abstract: Not Available Category: geoscientificInformation Source: Not Available Supplemental Information: Not Availble Coverage: EVENT LABEL: * LATITUDE START: -53.144700 * LONGITUDE START: -70.909100 * LATITUDE END: -53.144700 * LONGITUDE END: -70.909100 * DATE/TIME START: 2019-02-09T00:00:00 * DATE/TIME END: 2019-04-08T00:00:00 * CAMPAIGN: PS118 * BASIS: Polarstern * DEVICE: Underway cruise track measurements

Contributors: Schröder, Michael, Rohardt, Gerd

Date: 2019-11-15

... Abstract: Not Available Category: geoscientificInformation Source: Not Available Supplemental Information: Not Availble Coverage: EVENT LABEL: * LATITUDE START: -33.906800 * LONGITUDE START: 18.433700 * LATITUDE END: -53.144700 * LONGITUDE END: -70.909100 * DATE/TIME START: 2018-01-19T00:00:00 * DATE/TIME END: 2018-03-14T00:00:00 * CAMPAIGN: PS111 * BASIS: Polarstern * DEVICE: Underway cruise track measurements

Contributors: Strass, Volker H, Rohardt, Gerd

Date: 2019-11-15

... Abstract: Not Available Category: geoscientificInformation Source: Not Available Supplemental Information: Not Availble Coverage: EVENT LABEL: * LATITUDE START: -53.144700 * LONGITUDE START: -70.909100 * LATITUDE END: 53.567500 * LONGITUDE END: 8.554800 * DATE/TIME START: 2018-05-08T14:15:00 * DATE/TIME END: 2018-06-10T22:30:00 * CAMPAIGN: PS113 * BASIS: Polarstern * DEVICE: Underway cruise track measurements

Contributors: Yang, Gengchao

Date: 2019-10-25

... Abstract: The input files for the case D-VB. The files with the name started with "in" are input files for LIGGGHTS (https://github.com/CFDEMproject/LIGGGHTS-PUBLIC) and the C++ file is the input file for Palabos (http://www.palabos.org/). The input files are called in the following sequence: 1. in.cloud - generate the particles 2. in.rain - create a granular column by turning on the gravity 3. in.trim - trim the particles so that the aspect ratio is 0.8 4. damBreakImmersed.cpp - solve fluid filed using LBM 5. in.immerse - immersed the granular column 6. in.cycle - called by "damBreakImmersed.cpp" to advance the DEM simulation Other cases with different column sizes and packing densities can be simulated by the same input files with adjustments on the geometry and friction coefficients during sample preparation. Category: geoscientificInformation Source: Supplement to: Yang, Gengchao; Jing, L; Kwok, C Y; Sobral, Y D (in review): Pore-scale simulation of immersed granular collapse: Implications to submarine landslides. Journal of Geophysical Research-Earth Surface Supplemental Information: Not Availble Coverage: Not Available

Contributors: Feldmann, Johannes, Levermann, Anders, Mengel, Matthias

Date: 2019-10-21

... Abstract: There is evidence that a self-sustaining ice discharge from the West Antarctic Ice Sheet (WAIS) has started, potentially leading to its disintegration. The associated sea level rise of more than 3m would pose a serious challenge to highly populated areas including metropolises such as Calcutta, Shanghai, New York City, and Tokyo. Here, we show that the WAIS may be stabilized through mass deposition in coastal regions around Pine Island and Thwaites glaciers. In our numerical simulations, a minimum of 7400 Gt of additional snowfall stabilizes the flow if applied over a short period of 10 years onto the region (−2 mm year−1 sea level equivalent). Mass deposition at a lower rate increases the intervention time and the required total amount of snow. We find that the precise conditions of such an operation are crucial, and potential benefits need to be weighed against environmental hazards, future risks, and enormous technical challenges. Category: geoscientificInformation Source: Supplement to: Feldmann, Johannes; Levermann, Anders; Mengel, Matthias (2019): Stabilizing the West Antarctic Ice Sheet by surface mass deposition. Science Advances, 5(7), eaaw4132, https://doi.org/10.1126/sciadv.aaw4132 Supplemental Information: Snapshots for a set of three simulations (shown in Figs. 2 and 3 of the paper) Forcing_8000Gt_20yr --> forcing with 8000 Gt of additional snow over 20 yr Forcing_8000Gt_40yr --> forcing with 8000 Gt of additional snow over 40 yr NoForcing_Reference --> no addition of snow Coverage: EVENT LABEL: * LATITUDE: -75.000000 * LONGITUDE: -114.000000 * DEVICE: Multiple investigations

Contributors: Harris, Eliza, Ladreiter-Knauss, Thomas, Butterbach-Bahl, Klaus, Wolf, Benjamin, Bahn, Michael

Date: 2019-10-17

... Abstract: Not Available Category: geoscientificInformation Source: Not Available Supplemental Information: Not Availble Coverage: EVENT LABEL: * LATITUDE: 47.126000 * LONGITUDE: 11.290900 * LOCATION: Tyrolian Alps, Austria * DEVICE: Multiple investigations

Contributors: Harris, Eliza, Ladreiter-Knauss, Thomas, Butterbach-Bahl, Klaus, Wolf, Benjamin, Bahn, Michael

Date: 2019-10-17

... Abstract: Article abstract: Grasslands cover more than one fifth of total land area in Europe and contribute significantly to the total greenhouse gas budget. The impact of management and land use on the carbon cycle and carbon sequestration in grasslands has been well-studied, however effects on emissions of N2O and CH4 remain uncertain. Additionally, the majority of studies have focussed on management differences between intensively managed grasslands, with few results available for lightly managed grasslands and in particular grassland abandonment. We present N2O and CH4 flux measurements for an abandonment trajectory at low land-use intensity, comparing meadow (fertilized and cut), pasture (grazed) and abandoned (unmanaged since 1983) grassland sites located in the Austrian Alps. Mean growing season N2O fluxes were 0.07, 0.07 and −0.13 nmol m−2 s−1 and CH4 fluxes were −1.0, −0.5 and −1.6 nmol m−2 s−1 for the meadow, pasture and abandoned sites respectively. Variability for both gases at the abandoned site was dominated by 'hot moments', while 'hot spots' dominated at the managed meadow and pasture sites. Consideration of the diurnal cycle observed at the abandoned site, linear correlations within all data sets, and principal components analyses of the full data set revealed increased consumption of both N2O and CH4 with increasing temperature, but hardly any relationship between fluxes and soil moisture. Upscaled over a year, the observed fluxes correspond to enhanced non-CO2 greenhouse gas uptake of 172 g CO2-equiv. m−2 y−1 following abandonment. These results show that non-CO2 greenhouse gases form an important part of the total climate impact of land use change and grassland abandonment, such that abandoned grassland is a net sink for both CH4 and N2O. Category: geoscientificInformation Source: Supplement to: Harris, Eliza; Ladreiter-Knauss, Thomas; Butterbach-Bahl, Klaus; Wolf, Benjamin; Bahn, Michael (2018): Land-use and abandonment alters methane and nitrous oxide fluxes in mountain grasslands. Science of the Total Environment, 628-629, 997-1008, https://doi.org/10.1016/j.scitotenv.2018.02.119 Supplemental Information: Not Availble Coverage: Not Available

Contributors: Shao, Yilun, Piazolo, Sandra, Liu, Yongjian, Lee, Amicia L, Jin, Wei, Li, Weimin, Liang, Chenyue, Wen, Quanbo

Date: 2019-10-16

... Abstract: This data includes both rocks' EBSD data and scripts by MTEX & MSAT toolboxes. Category: geoscientificInformation Source: Supplement to: Shao, Yilun; Piazolo, Sandra; Liu, Yongjian; Lee, Amicia L; Jin, Wei; Li, Weimin; Liang, Chenyue; Wen, Quanbo (submitted): Deformation behavior and inferred seismic signal of tonalitic migmatites at the time of partial melting and post-solidification. Supplemental Information: Not Availble Coverage: Not Available