DataverseNO
Not a member yet
2167 research outputs found
Sort by
GNSS Scintillation Data (60 s) at Bjørnøya in 2022
No full textThis data set contains phase and amplitude scintillation data at 60 seconds time resolution at Bjørnøya, Svalbard.
The measurements were collected by the University of Bergen using a NovAtel GPStation-6 global navigation satellite system receiver. The measurements include signals from GPS, GLONASS, and GALILEO at different frequencies. These data are used for research on space weather disturbances in the polar ionosphere.
A detailed description of the data structure and format is gathered in the documentation data set: Oksavik, Kjellmar, 2020, "Documentation of GNSS Total Electron Content and Scintillation Data (60 s) at Svalbard", DataverseNO, https://doi.org/10.18710/EA5BYX
This data set is part of a larger collection: Oksavik, Kjellmar, 2020. "The University of Bergen Global Navigation Satellite System Data Collection". DataverseNO. https://doi.org/10.18710/AJ4S-X394.
</p
Replication Data for: The reindeer circadian clock is rhythmic and temperature-compensated but shows evidence of weak coupling between the secondary and core molecular clock loops
No full textThe purpose of the publication was to investigate the molecular circadian clock in an Arctic context by contrasting reindeer with mouse fibroblast cell cultures. Cell cultures were transduced with promoter luciferase reporters for the clock genes Bmal1 and Per2. The data acquired from the promoter reporter measurements were to some extent confirmed by mRNA abundance measurements done by qPCR.
The data set published here contains the promoter reporter data, measured as bioluminescence in a PMT (photon multiplier tube) and qPCR data
Replication Data for: Vortex imprints on a free surface as proxy for surface divergence
No full textThis is a complementary data and computer code set to the accepted manuscript "Vortex imprints on a free surface as proxy for surface divergence". It contains the surface layer of the DNS data set used and the code to analyse it in the ways described in the article. The work was funded by the European Union (ERC, WaTurSheD grant 101045299) and the Research Council of Norway (iMod, grant 325114). The research by A. Xuan and L. Shen is also supported by the Office of Naval Research and National Science Foundation. Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Research Council. Neither the European Union nor the granting authority can be held responsible for them
Medborgerundersøkelsen Innlandet 2018
No full textDette er datasett til et prosjekt: Medborgerundersøkelsen Innlandet 2018. Prosjektet hadde til hensikten en befolkningskartlegging blant innbyggere i Hedmark og
Oppland, for Høgskolen i Innlandet. Kartleggingen er dels en oppfølging av tidligere tilsvarende undersøkelse i 2013, og skal brukes i forsknings- og utredningsøyemed.
Datasett til tidligere tilsvarende undersøkelse er også tilgjengelig via INN Open Data Archive under tittelen "Medborgerundersøkelsen 2013", https://doi.org/10.18710/TXIMZ4
Replication Data for: "Local seismicity and sediment deformation in the west Svalbard margin: Implications of neotectonics for seafloor seepage"
No full textThe attached dataset contains earthquake locations and the input files for software used to calculate them (HYPOSAT) and two seismic lines presented in the manuscript. Earthquakes were recorded during an ocean bottom seismometer experiment (OBS) between 08-2020 and 07-2021. Ten instruments were deployed on the seafloor in the Fram Strait, offshore west Svalbard during research cruise CAGE20-5 (https://doi.org/10.7557/cage.6909) and recovered during cruise CAGE21-3 (https://doi.org/10.7557/cage.6914). Both cruises took place on R/V Helmer Hansen. The purpose of the experiment was to improve understanding of local fluid flow systems and seafloor gas seepage and investigate tectonic influence on fluid flow processes (within the framework of the funding project "SEAMSTRESS" awarded to Andreia Plaza-Faverola)
Replication data for: Factors determining parasite abundance in three freshwater fish, European perch (Perca fluviatilis), European whitefish (Coregonus lavaretus), and Arctic charr (Salvelinus alpinus), in an oligotrophic lake, southern Norway.
No full textDATASET MIGRATED FROM FIGSHARE: Figures, data and software code for Factors determining parasite abundance in three freshwater fish, European perch (Perca fluviatilis), European whitefish (Coregonus lavaretus), and Arctic charr (Salvelinus alpinus), in an oligotrophic lake, southern Norway.Article Abstract - Related PublicationTemporal and spatial variations in macroparasite status were investigated in European perch, Perca fluviatilis, European whitefish, Coregonus lavaretus, and Arctic charr, Salvelinus alpinus in Lake Norsjø (Southern Norway), based on gillnet fishing in three locations in the spring, summer, and fall 2018. In addition, length, weight, age, sex, δ13C, and δ15N were determined. Parasite abundance was modelled using negative binomial generalized linear models in relation to fish metrics, season, and sampling location. The most prevalent parasite species were determined by the diet and habitat of the host. European perch was mainly infected by acanthocephalans, European whitefish mainly infected by acanthocephalans and cestodes, and Arctic charr mainly infected by cestodes. The most prevalent parasites in European perch are transmitted by benthic animals. Parasites in European whitefish are transmitted by both benthic animals and copepods, while the most prevalent parasites in Arctic charr are copepod transmitted. This corresponds well with the δ13C signatures in the three species, indicating that European perch primarily fed in the littoral zone (δ13C: -24.9 ± 2.5 ‰), Arctic charr in the pelagic and profundal zone (δ13C: -29.4 ± 1.1 ‰), while European whitefish both fed in the littoral and pelagic zone (δ13C: -28.3 ± 2.3 ‰) of Lake Norsjø. Individual abundances of parasites depended on host age, length, sex, δ15N, and season. Positive correlations between parasite abundance and host age, length, or trophic level measured as δ15N were most common, and occurred in all three host species. Many parasites accumulate with age, and larger hosts provide more diverse habitats for parasites.</p
Replication data for: Long-term capture and handling effects on body condition, reproduction and survival in a semi-aquatic mammal
No full textDATASET MIGRATED FROM FIGSHARE: Data from Mortensen and Rosell (2020), "Long-term capture and handling effects on body condition, reproduction and survival in a semi-aquatic mammal", Scientific Reports.Article Abstract - Related PublicationIn long-term individual-based field studies, several parameters need to be assessed repeatedly to fully understand the potential fitness effects on individuals. Often studies only evaluate capture stress that appears in the immediate weeks or breeding season and even long-term studies fail to evaluate the long-term effects of their capture procedures. We investigated effects of long-term repeated capture and handling of individuals in a large semi-aquatic rodent using more than 20 years of monitoring data from a beaver population in Norway. To investigate the effects, we corrected for ecological factors and analysed the importance of total capture and handling events, years of monitoring and deployment of telemetry devices on measures related to body condition, reproduction and survival of individual beavers. Body mass of dominant individuals decreased considerably with number of capture events (107 g per capture), but we found no statistically clear short or long-term effects of capture and handling on survival or other body condition indices. Annual litter size decreased with increasing number of captures among older individuals. Number of captures furthermore negatively affected reproduction in the beginning of the monitoring, but the effect decreased over the years, indicating habituation to repeated capture and handling. By assessing potential impacts on several fitness-related parameters at multiple times, we can secure the welfare of wild animal populations when planning and executing future conservation studies as well as ensure ecologically reliable research data.</p
Replication data for: An Arctic natural oil seep investigated from space to the seafloor
No full textPrins Karls Foreland is a small and elongated island on the western flank of the Svalbard archipelago. It belongs to the system of complex host and graben structures of the West-Spitsbergen fold-and-thrust belt. Intense gas flaring and oil slicks have been observed at this site.
Within the scope of the research cruise AKMA 1 (CAGE21-1) under the helm of the Norwegian Centre of Excellence for Arctic Gas Hydrate, Environment and Climate at the UiT The Arctic University of Norway, superstation 1 was investigated to understand the effects of gas hydrates and methane seepage systems on our oceans and ecosystems.
The dataset includes a list of sediment and carbonate samples collected during CAGE21-1 at Superstation 1 (Prins Karls Foreland) and results for carbon and nitrogen isotopes, dissolved inorgani carbon isotopes, headspace gas, grain size, methane isotopes and foraminifera stable isotope analysis including photomosaics.
Abstract of Related publication
Due to climate change, decreasing ice cover and increasing industrial activities, Arctic marine ecosystems are expected to face higher levels of anthropogenic stress. To sustain healthy and productive ocean ecosystems, it is imperative to build baseline data to assess future changes. Herein, a natural oil seep site offshore western Svalbard (Prins Karls Forland, PKF, 80–100 m water depth), discovered using satellite radar images, was investigated using an extensive multiscale and multisource geospatial dataset collected by satellite, aerial, floating, and underwater platforms. The PKF seep covers roughly a seafloor area of 30,000 m2 and discharges oil from Tertiary or younger source rocks. Biomarker analyses confirm that the oil in the slicks on the sea surface and from the seep on the seafloor have the same origin. Uranium/Thorium dating of authigenic carbonate crusts indicated that the seep had emanated since the Late Pleistocene when ice sheet melting unlocked the hydrocarbons trapped beneath the ice. The faunal communities at the PKF seep are a mix of typical high latitude fauna and taxa adapted to reducing environments. Remarkably, the inhospitable oil-impregnated sediments were also colonized by abundant infaunal organisms. Altogether, in situ observations obtained at the site provide essential insights into the characteristics of high–latitude oil seeps and can be used as a natural laboratory for understanding the potential impacts of human oil discharge into the ocean
Replication Data for: Novel frontier in wildlife monitoring: identification of small rodent species from faecal pellets using Near-Infrared Reflectance Spectroscopy (NIRS)
No full textSmall rodents are prevalent and functionally important across the world’s biomes, making their monitoring salient for ecosystem management, conservation, forestry and agriculture. There is a growing need for cost-effective and non-invasive methods for large-scale, intensive sampling. Fecal pellet counts readily provide relative abundance indices, and given suitable analytical methods, feces could also allow for determination of multiple ecological and physiological variables, including community composition. In this context, we developed calibration models for rodent taxonomic determination using fecal near-infrared reflectance spectroscopy (fNIRS).
Our results demonstrate fNIRS as an accurate and robust method for predicting genus and species identity of five co-existing subarctic microtine rodent species. We show that sample exposure to weathering increases the method’s accuracy, indicating its suitability for samples collected from the field. Diet was not a major determinant of species prediction accuracy in our samples, as diet exhibited large variation and overlap between species. fNIRS could also be applied across regions, as calibration models including samples from two regions provided a good prediction accuracy for both regions.
We show fNIRS as a fast and cost-efficient high-throughput method for rodent taxonomic determination, with the potential for cross-regional calibrations and the use on field-collected samples. Importantly, appeal lies in the versatility of fNIRS. In addition to rodent population censuses, fNIRS can provide information on demography, fecal nutrients, stress hormones and even disease. Given development of such calibration models, fNIRS analytics could complement novel genetic methods and greatly support ecosystem- and interaction-based approaches to monitoring
Replication Data for Microphone recording of flexural waves for estimation of lake ice thickness
No full textThis dataset is a collection of audio recordings from three frozen lakes that were acquired with the primary purpose of estimating ice thickness using recorded air-coupled flexural waves. The flexural waves were excited by different impulsive artificial sources (hammer strikes, jumping, ice skates) and natural sources (thermal expansion/contraction cracks i.e. icequakes). The flexural wave event characteristics and timings within the audio files are described in the event table.In this study we took an intentionally low-tech approach, aiming to estimate key physical parameters of lake ice using a single, inexpensive microphone. We consider this approach highly relevant to the issue of transport safety and the relatively high number of accidents involving breakthrough failure of thin ice underlines the importance of this topic. We conducted a range of experiments on three frozen lakes in the Tromsø region of Northern Norway and found that the monochromatic air-coupled flexural wave was a robust feature of impulsively excited frozen lakes. Ice thickness was estimated via a closed form solution that only depends on the measured monochromatic frequency of the air-coupled flexural wave and a set of assumed physical parameters for the ice, air and water. We discuss the impact of uncertainty in the assumed parameters on estimated ice thickness and bearing capacity, finding the uncertainty to be quite small, particularly when physical observation of ice type or drilled thickness are available to constrain the assumed Young’s modulus of the ice. Ice thicknesses estimated from air-coupled flexural waves were typically within 5-10% of ice thickness measured in holes drilled in the vicinity of the microphone for both artificial sources including hammer strikes, jumping and tapping with ice skates and natural ice quakes. The thickness estimates were also similarly accurate whether the microphone was resting on the ice, placed on land along the shoreline or handheld. We also showed that it is possible to record the dispersive ice flexural wave using a microphone, particularly when it was resting on the ice surface. Since thickness was constrained by the air-coupled flexural wave, we were able to estimate the propagation distance, corresponding to the horizontal offset between source and microphone, by inversion of the time dispersed arrival of the chirp signal corresponding to the ice flexural wave. We also demonstrated that a microphone can record inharmonic monochromatic overtones of the air-coupled flexural wave, that were linked to the geometry and boundary conditions of the frozen lakes using finite element modal analysis. This study leads us to conclude that a simple microphone can be a powerful tool giving a surprising amount of information on the lake-ice system. Using a microphone to record air-coupled flexural waves appears to be a promising additional tool for evaluation of ice conditions, convenient enough that it could substantially increase the availability of timely and accurate information on ice thickness and thereby contribute to safer travel on floating ice.</p