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Data for Altimetry-based ice-marginal lake water level changes in Greenland
No full textDescription:
Greenland-wide dataset showing water level changes of 1,152 ice-marginal lakes from February 2003 to April 2023. The data is provided as a point shapefile and contains lake-specific characteristics, including: i) Lake ID, ii) estimated maximum and minimum water levels, and water level difference (dWL), iii) number of altimetry observations. Additionally, for all lakes experiencing glacial lake outburst floods (GLOFs), the dataset also includes: i) drainage year(s), ii) pre- and post-drainage water levels, iii) largest GLOF.
Method:
We use airborne and satellite altimetry observations from ATM, ICESat, and ICESat-2 to estimate water level changes of ice-marginal lakes (IMLs) in Greenland from February 2003 to April 2023. We utilize lake outlines from the mapping of Greenland conducted by The Danish Agency for Data Supply and Infrastructure (https://dataforsyningen.dk/data/4771) to spatially filter the altimetry observations. For each IML, we apply statistical filtering to remove outlying observations and subsequently calculate the maximum water level difference (dWL). All lakes with a dWL > 4m (n = 465) are manually inspected for GLOF behavior.
For a complete description of the data processing, please refer to the corresponding paper: Dømgaard et al., 2024 (DOI: 10.1038/s43247-024-01522-4), Altimetry-based ice-marginal lake water level changes in Greenlan
PRODEM: Annual summer DEMs of the marginal areas of the Greenland Ice Sheet
No full textSurface topography across the marginal zone of the Greenland Ice Sheet is constantly evolving in response to seasonal variability, longer-term climate change, and glacier dynamics. Yet, current Digital Elevation Models (DEMs) for the ice sheet are usually based on data from a multi-year period, thus obscuring these changes over time. PRODEM is an annual series of summer DEMs in 500-meter resolution of the ice sheet marginal zone, a 50km wide band covering all outlet glaciers of the Greenland ice sheet. The annual summer DEMs follow the naming convention PRODEMyy, with yy being the year. The data series starts in summer 2019, and the product is expected to be updated annually over the coming years
Supplementary data to Pilbeam et al. submitted to Journal of Petrology February 2024.
No full textSupplementary data set for manuscript submitted to Journal of Petrology , February 2024. The manuscript is entitled: “Links between calcite-kimberlite, aillikite and carbonatite in West Greenland: Numeric modeling of compositional relationships” and authored by Pilbeam, L. H., Nielsen, T.F.D, Waight, T, & Tappe, S. The provided information includes File SI1: Analytical methods; Table SI2: EMPA data for olivine; Table SI3: EMPA data for clinopyroxene; Table SI4: EMPA data for phlopgopite; Table SI5: EMPA data for perovskite; Table SI6: EMPA data apatite; Table SI7: EMPA data for calcite and Table SI8: New bulk rock major and trace element compositio
Supplementary files for: The Kangâmiut dykes in West Greenland: markers of the tectono-metamorphic evolution of the southern Nagssugtoqidian orogen and its foreland
No full textThe general extent and structural evolution of the southern Nagssugtoqidian orogen of West Greenland were first described by Hans Ramberg who based much of his paper on the deformation of the regional Kangâmiut dyke swarm. The southern boundary is marked by a transition from undeformed, discordant dykes in the south to highly deformed dykes and host rocks to the north. Our analysis of the southern Nagssugtoqidian orogen and its southern foreland uses a comprehensive compilation of available data and covers the area from Sisimiut in the north to Alanngua, south of Maniitsoq. This represents almost the entire c. 200 km latitudinal extent of the Kangâmiut dyke swarm and encompasses the complete range of Nagssugtoqidian overprint on these dykes and their country rocks. South of Itillip Ilua (Itilleq), the structural and metamorphic overprints on the dykes exhibit a considerable range in both intensity and P–T conditions between and even within outcrops. In contrast, north of Itillip Ilua, the rocks show more systematic gradual increases in the degree of structural overprints and metamorphic grade, culminating in the Ikertooq thrust zone where granulite facies rocks are brought southwards over amphibolite facies rocks. Currently, available age data from the Nagssugtoqidian orogen permits the identification of two metamorphic episodes at c. 1850–1800 Ma and c. 1780–1720 Ma. These groups of metamorphic ages are supported by recent 40Ar–39Ar ages from dykes in the same area, which cluster at c. 1860 Ma and c. 1740 Ma, respectively. Albeit geographically sporadic, both age intervals support a subdivision of the Nagssugtoqidian structural and metamorphic overprints across the southern Nagssugtoqidian orogen and its foreland into two distinguishable temporal phases. Further geochronological investigations may well, however, find these two phases to be part of a tectonic continuum. For now, it is thought that the older event records south-directed thrusting over the foreland and concomitant loading of this crust, at least as far south as Maniitsoq. This c. 1860–1800 Ma crustal shortening and thrusting likely also closed a depositional basin located at the current latitude of Ikertooq, which could have formed during an early-orogenic extensional event that enabled and accompanied the c. 2035 Ma emplacement of Kangâmiut dykes. Up to 50–100 Ma later, a younger (c. 1780–1720 Ma) phase of shearing and thrusting mainly affected the Itillip Ilua – Ikertooq area and likely overprinted elements of the former event. This local younger overprint generated a separate trend of distinctly northward-increasing deformation and metamorphism
Groundwater Redox Modeling Denmark
No full textThis repository contains data used to model depth to first redox interface and redox conditions at 25 m resolution at national scale of Denmark.
The following data are included:
- sediment color derived depth to first redox interface (FRI_trainingsdata.csv)
- water chemistry, i.e. nitrate concentrations (Redox_Complexity_trainingsdata.csv)
- covariate maps used as explanatory variables in ML model (./covariates/)
- resulting maps of depth to first redox interface, redox complexity (probability of continuous redox conditions) and coefficient of variation (uncertainty of FRI map
Two-Way Time (TWT) grids from the Jammerbugt project
No full textGEUS’ gridded interpretations in two-way time of the Jammerbugt structure from the CCS2022–2024 project.
The grids in two-way time from key seismic horizons of this folder are based on 2D seismic data acquired in 2023 (the GEUS2023-Jammerbugt survey) and legacy seismic data and published as of date: February 27nd, 2024.
The work is finalized and reported in a published GEUS report (see reference with link below) and the grids of key interpretations are provided for reference of the initial maturation of the structure.
GEUS disclaims any responsibility of the grids, their exactness as well as the applicability of the data to the customer’s purpose. Any use of the interpretations from this folder are not the responsibility of GEUS. Please also refer to GEUS terms of delivery (GEUS_Terms_of_Delivery_20230919.pdf, available in this folder).
The seismic interpreted grids are made in Petrel (2022 version) in two-way time (negative values as standard of Petrel), with a grid size of 250 X 250 meter, smoothed (1 iteration: “1xsm” in filename), and exported from Petrel (Zmap+) as .dat (ASCII) files. The projection is UTM31
Contents of this folder (TWT grids, fault polygons and GEUS’ terms of delivery):
Grids:
Jammerbugt_Base Chalk_twt_250x250mGrid_1xsm_geus2024.dat
Jammerbugt_Top Chalk_twt_250x250mGrid_1xsm _geus2024.dat
Jammerbugt_Top Fjerritslev Fm_Near HaldagerS Fm_twt_250x250mGrid_1xsm _geus2024.dat
Jammerbugt_Top Oddesund Fm_twt_250x250mGrid_1xsm _geus2024.dat
Jammerbugt_Top PreZechstein_twt_250x250mGrid_1xsm _geus2024.dat
Jammerbugt_Top Skagerrak Fm_twt_250x250mGrid_1xsm _geus2024.dat
Jammerbugt_Top Trias Gassum Fm_twt_250x250mGrid_1xsm _geus2024.dat
Jammerbugt_Top Zechstein_twt_250x250mGrid_1xsm _geus2024.dat
Fault polygons:
Jammerbugt_Base Chalk_faults.dat
Jammerbugt_Top Fjerritslev Fm_Near HaldagerS Fm_faults.dat
Jammerbugt_Top Oddesund Fm_faults.dat
Jammerbugt_Top PreZechstein_faults.dat
Jammerbugt_Top Skagerrak Fm_faults.dat
Jammerbugt_Top Trias Gassum Fm_faults.dat
Jammerbugt_Top Zechstein_faults.dat
GEUS_Terms_of_Delivery_20230919.pdf (available in this folder
Supplementary files for: Open access nationwide data sets for drinking water hardness at public waterworks and their water supply areas in Denmark
No full textThree spatiotemporal data sets of drinking water hardness in Denmark (version 1) are presented here: (1) annual drinking water hardness at public waterworks (1905–2023); (2) annual drinking water hardness at their water supply areas (1978–2023) and (3) the latest drinking water hardness at the water supply areas (1980–2023). Raw data were extracted from the Jupiter database for groundwater and drinking water data in Denmark, and were quality-assured. Hardness was calculated after semi-automatic outlier exclusion based on Ca and Mg, or if not available, the reported total hardness. Data were further aggregated at the waterworks level by the annual mean and at the supply area level by the weighted mean (weighted to waterworks annual abstraction volumes). Temporal and spatial gaps were filled prior to these aggregations. Various stakeholders could benefit from these open access data. They provide a societal service in response to increased public interest in drinking water hardness. The research community could use the data in environmental, exposure or epidemiological assessments. Finally, the water supplies and the public sector could benefit from these data as they provide a nationwide overview of current and past drinking water hardness in Denmark and highlight the geographic areas that lack recent data, most probably due to de-regulation
AEROMAG 1992-2013: magnetic map
No full textThe total magnetic intensity map from the AEROMAG 1992-2013 project is generated by merging grids of separately processed datasets with the grid knitting module of the software Oasis Montaj. The crustal magnetic field model MF7 https://geomag.colorado.edu/magnetic-field-model-mf7.html is used as a regional reference grid when merging the datasets. The magnetic anomaly map is IGRF corrected, but is not reduced-to-the-pole. The grid sampling is 100 x 100 m and the used coordinate system is WGS 84 / UTM zone 22N.
The grid of the total magnetic anomaly map is provided in the following formats:
(1) GeoTIFF Color (*.tif)
(2) Geosoft Color Grid (*grd)
(3) ArcView BinaryRaster grid (*flt)
(4) xy ASCII data (*.xyz)
In addition, presented images of AEROMAG maps on the Greenland Portal are provided as GeoTiff files
Data from sediment lake cores from Saqqaq, West Greenland
No full textData from lake sediment core scanning (optical, MS, X-ray, XRF) and AMS radiocarbon dating result certificates. Analysed in: Korsgaard et al.: Evidence of middle Holocene landslide-generated tsunamis recorded in lake sediments from Saqqaq, West Greenland, Natural Hazards and Earth Systems Science, 2024
Data for Climate variability and glacier dynamics linked to fjord productivity changes over the last ca. 3300 years in Nuup Kangerlua, Southwest Greenland
No full textDataset presented in Oksman, Kvorning, Pearce, Korsgaard, Lea, Seidenkrantz, Ribeiro (2024) Climate variability and glacier dynamics linked to fjord productivity changes over the last ca. 3300 years in Nuup Kangerlua, Southwest Greenland, Paleoceanography and Paleoclimatology 39, e2023PA004710.
Data on grain-size distribution, TOC, stable isotopes of C and N, biogenic silica and diatom assemblages from sediment cores SA13-ST6-36R and SA13-ST9-64G