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monthly and annual CARRA data at Zackenberg 1991 to 2021
No full text
monthly and annual CARRA time series data at points
Here are CARRA monthly 2m air temperature (t2m) or total precipitation (tp) or rainfall (rf) at GEUS AWS sites 1991 to 2021 31 years. The data are in comma separated files (.csv) for static point locations in Greenland. The data for each location is the monthly or annual average (or total, for precipitation) of daily nearest-neighbor on the 2.5 km CARRA grid point.
The original source is the Copernicus Climate Change Service (C3S) Climate Data Store (CDS) produced by C3S. The data produced by contractors under C3S (ECMWF) belongs to C3S although they are public and free to use.
includes simple graphics
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Algorithm Theoretical Basis Document for Sentinel-3 snow and ice (SICE) products, Version 5.1
No full textSentinel-3 snow and ice (SICE) products, Algorithm Theoretical Basis Document, Version 5.1, October 1, 202
Ground penetrating radar data near the A380 engine recovery site
No full textDense track-on-track radar data collected as part of the A380 engine recovery projec
Snow-water equivalent of snowpacks
No full textThe SnowFox sensor observes snow-water equivalent (SWE) by the attenuation of cosmic-ray neutrons. The sensor is located close to a PROMICE automatic weather station to complement the snow depth measurements.
Please have a look at the readme file
Supplementary files for: New insights from field observations of the Younger giant dyke complex and mafic lamprophyres of the Gardar Province on Tuttutooq island, South Greenland
No full textThe Gardar Province of south Greenland is defined by the products of alkaline igneous magmatism during the Mesoproterozoic. The most laterally extensive Gardar intrusions are a series of giant dyke complexes best exposed on the Tuttutooq archipelago. We present new field observations and a geological map of north-east Tuttutooq island that provide fresh insights into the temporal evolution of the Younger giant dyke complex and two associated ultramafic lamprophyres. Our data demonstrate that distinctive crystallisation regimes occurred in different sectors of the dyke complex, leading to the formation of marginal gabbros and ovoid pod-like domains displaying lamination, modal layering and/or more evolved differentiates. We infer that at least two pulses of magma contributed to the formation of the Younger giant dyke complex. In addition, the relative ages of two ultramafic lamprophyre diatremes are constrained and attributed to two distinct phases of rifting in the Gardar Province
Supplementary files for: Fingerprinting sources of salinity in a coastal chalk aquifer using trace elements
No full textSalinity levels above the drinking-water standard (> 250 mg/l Cl–) are observed at shallow depth in a Maastrichtian chalk aquifer on Falster, south-eastern Denmark. To understand the source of the salt, 63 samples from 12 individual, 1 m, screened intervals between 14–26 m b.s. were collected from 1 May to 4 June, 2018. The samples were collected during a tracer test to estimate the dual porosity properties of the chalk and analysed for a wide range of elements. Further, samples from the Baltic Sea as well as from deeper saline aquifers in the area (40 and 85 m b.s.) were analysed for comparison. The geochemical data were analysed using an unsupervised machine-learning algorithm, self‐organising maps, to fingerprint water sources. The water composition in the screened intervals at various stratigraphic levels have specific geochemical fingerprints that are maintained for the first days of pumping and are distinct among the different levels. This suggests an evolution in water composition due to reaction with the chalk. Water composition is distinct from both seawater from the nearby Baltic Sea and salty water from deeper levels of the reservoir. Thus, neither up-coning of salty water, nor intrusion of seawater caused the elevated salinity levels in the area. The slightly saline composition of groundwater in the shallow aquifer (14 to 26 m b.s.) is more likely due to incomplete refreshing of the salty connate water in the chalk during the Pleistocene and Holocene. Further, the geochemical fingerprint of salty water from the deeper aquifer at 40 m was similar to water from the Baltic Sea, suggesting a Baltic Sea source for salt in the aquifer at 40 m b.s., c. 100 m from the coast. Statistical analysis based on self-organising maps are an effective tool for interpretating a large number of variables to understand the compositional variation in an aquifer and a useful alternative to linear dimensionality-reduction methods such as principal component analysis. The approach using multi-element analysis combined with self‐organising maps may be useful in future studies of groundwater quality
Catchment Dataset Denmark
No full textThis dataset can be used as input data for rainfall-runoff modelling for over 300 Danish catchments. Specifically, this dataset was used for a machine learning (LSTM) model application using the neuralhydrology codebase: https://neuralhydrology.github.io/ The data provided allows to reproduce the simulation results in the publication stated below.
More information is provided in the readme document
Snow broadband albedo, specific surface area and optical grain diameter from Sentinel-3's OLCI, daily 1 km mosaics, Greenland
No full textThis dataset contains:
albedo_bb_planar_sw.tif
Shortwave broadband planar albedo (300-2400 nm)
diagnostic_retrieval.tif
Per-pixel information about the retrieval.
al.tif
Effective absorption length (mm)
r0.tif
Reflectance of a semi-infinite non-absorbing snow layer
snow_specific_area.tif
Snow specific surface area (m^2 kg^-1)
grain_diameter.tif
Snow effective optical grain diameter (mm)
Can be used to flag surface melt above 0.64 mm.
For TOA reflectance, see:
Vandecrux, Baptiste; Box, Jason; Mankoff, Ken; Wehrlé, Adrien, 2021, "OLCI top-of-the-atmosphere reflectances with auxillary data, daily 1 km mosaics, Greenland",
https://doi.org/10.22008/FK2/B674AR
, GEUS Dataverse
In this version:
- Clouds have been removed
- SNAP7 was used with per-pixel geocoding
- pySICEv1.4 was used
Processing scripts:
https://github.com/GEUS-SICE/SICE
https://github.com/GEUS-SICE/pySICE
ATBD:
Kokhanovsky, A.; Box, J.; Vandecrux, B. Pre-operational Sentinel-3 Snow and Ice (SICE) Products: Algorithm Theoretical Basis Document. Preprints 2020,
https://doi.org/10.20944/preprints202009.0529.v1).
Related studies:
Kokhanovsky, A.; Lamare, M.; Danne, O.; Brockmann, C.; Dumont, M.; Picard, G.; Arnaud, L.; Favier, V.; Jourdain, B.; Le Meur, E.; Di Mauro, B.; Aoki, T.; Niwano, M.; Rozanov, V.; Korkin, S.; Kipfstuhl, S.; Freitag, J.; Hoerhold, M.; Zuhr, A.; Vladimirova, D.; Faber, A.-K.; Steen-Larsen, H.C.; Wahl, S.; Andersen, J.K.; Vandecrux, B.; van As, D.; Mankoff, K.D.; Kern, M.; Zege, E.; Box, J.E. Retrieval of Snow Properties from the Sentinel-3 Ocean and Land Colour Instrument. Remote Sens. 2019, 11, 2280.
https://doi.org/10.3390/rs11192280
Kokhanovsky, A.; Box, J.E.; Vandecrux, B.; Mankoff, K.D.; Lamare, M.; Smirnov, A.; Kern, M. The Determination of Snow Albedo from Satellite Measurements Using Fast Atmospheric Correction Technique. Remote Sens. 2020, 12, 234.
https://doi.org/10.3390/rs12020234
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Camp Century: Firn temperature measurements (CEN-THM)
No full textFirn temperature data at Camp Century (CEN-THM)
Project leader:
William Colgan ([email protected])
Contact:
Baptiste Vandecrux ([email protected])
Please cite the following study when using these data:
Vandecrux, B., Colgan, W., Solgaard, A.M., Steffensen, J.P., and Karlsson, N.B.(2021). Firn evolution at Camp Century, Greenland: 1966-2100, Frontiers in Earth Science, https://doi.org/10.3389/feart.2021.578978, 2021
Initial sensor depth (in meters) for the long string:
0 2 4 6 8 10 12 14 16 18 21 24 27 30 33 36 39 42 45 48 53 58 63 68 73
Initial sensor depth (in meters) for the short string:
0 1 2 3 4 5 6 7 8 9 11 13 15 17 19 22 25 28 31 34 38 42 46 50 54
Format:
comma separated
first column is the time stamp, the others are firn temperature in degree Celsius
Temporal coverage:
2017-07-26 to 2025-12-09<br
Supplementary files for: Monitoring for seismological and geochemical groundwater effects of high-volume pumping of natural gas at the Stenlille underground gas storage facility, Denmark
No full textThe large natural gas storage facility at Stenlille, Denmark, has been monitored to investigate the effect of pumping large amounts of gas into the subsurface. Here, we present a new dataset of microseismicity at Stenlille since 2018. We compare these data with methane in groundwater, which has been monitored since gas storage was established in 1989. Further, we conducted a controlled 172 day microcosm experiment of methane oxidation on an isolated microbial community under both aerobic and anaerobic conditions. For this experiment, water was filtered from a well at Stenlille with elevated levels of thermogenic methane and ethane. No micro seismic activity was detected in the gas storage area above an estimated detection level of ML 0.0 for the established network. The long-term monitoring for methane in groundwater has still only detected one leak, in 1995, related to a technical problem during injection. The microcosm experiment revealed that oxidation of methane only occurred under aerobic conditions during the experiment, as compared to anaerobic conditions, even though the filtered water was anoxic