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11 results for “Carbon Dwarfs”
Data from: Dwarf shrubs impact tundra soils: drier, colder, and less organic carbon
<p>In the tundra, woody plants are dispersing towards higher latitudes and altitudes due to increasingly favourable climatic conditions. The coverage and height of woody plants are increasing, which may influence the soils of the tundra ecosystem. Here, we use structural equation modelling to analyse 171 study plots and to examine if the coverage and height of woody plants affect the growing-season topsoil moisture and temperature (< 10 cm) as well as soil organic carbon stocks (< 80 cm). In our study setting, we consider the hierarchy of the ecosystem by controlling for other factors, such as topography, wintertime snow depth and the overall plant coverage that potentially influence woody plants and soil properties in this dwarf-shrub dominated landscape in northern Fennoscandia. We found strong links from topography to both vegetation and soil. Further, we found that woody plants influence multiple soil properties: the dominance of woody plants inversely correlated with soil moisture, soil temperature, and soil organic carbon stocks (standardised regression coefficients = -0.39; -0.22; -0.34, respectively), even when controlling for other landscape features. Our results indicate that the dominance of dwarf shrubs may lead to soils that are drier, colder, and contain less organic carbon. Thus, there are multiple mechanisms through which woody plants may influence tundra soils.</p> <p>Kemppinen, Niittynen, Virkkala, Happonen, Riihimäki, Aalto & Luoto (2021). Dwarf shrubs impact tundra soils: drier, colder, and less organic carbon. Ecosystems.</p> <p>These are the data from Kemppinen et al. (2021).</p>
Faint calcium-rich transient from a double-detonation of a 0.6 M⊙ carbon-oxygen white dwarf star: Complimentary material
<p>Complimentary material to the manuscript.<br> The videos show the hydrodynamical evolution of the merger leading to the double-detonation.</p> <p>The movie "overdensity_formation.mp4" shows slices through the orbital plane color coded with the density (left) and the temperature (right), displaying frame by frame the formation of a cold, overdense fluid parcel after the disruption of the HeWD. <br> <br> The remaining movies show the overall evolution of different quantities with slices through the orbital plane on the left and perpendicular to the orbital plane on the right.</p>
The outcomes of carbon-oxygen white dwarfs accreting CO-rich material
<p>MESA inlist associated files for <a href="https://ui.adsabs.harvard.edu/#abs/2019MNRAS.483..263W/abstract">The outcomes of carbon-oxygen white dwarfs accreting CO-rich material</a></p>
Carbon Shell or Core Ignitions in White Dwarfs Accreting from Helium Stars
<p>MESA inlists and run_star_extras associated with <a href="https://ui.adsabs.harvard.edu/?#abs/2016ApJ...821...28B">Brooks et al. (2016)</a>. MESA version 7624.</p> <p>Publication DOI: <a href="https://doi.org/10.3847/0004-637X/821/1/28">10.3847/0004-637X/821/1/28</a></p>
Properties of Carbon-Oxygen White Dwarfs From Monte Carlo Stellar Models
<p>MESA inlists and models associated with <a href="https://ui.adsabs.harvard.edu/?#abs/2016ApJ...823...46F">Fields et al. (2016)</a>. MESA version 7624.</p> <p>Publication DOI: <a href="https://doi.org/10.3847/0004-637X/823/1/46">10.3847/0004-637X/823/1/46</a></p>
On The Impact of 22Ne On The Pulsation Periods of Carbon-Oxygen White Dwarfs With Helium Dominated Atmospheres
<p>This file contains the python scripts needed to re-produce figures 2-11 in our paper. It also contains the information to re-run our 22Ne tests and other WD mass models. The README.md file contains a more detailed description of the data. </p>
Soil organic carbon in drylands: shrub encroachment and vegetation management effects dwarf those of livestock grazing
Dryland ecosystems occur worldwide and play a prominent, but potentially shifting, role in global biogeochemical cycling. Widespread woody plant proliferation, often associated with declines in palatable grasses, has jeopardized livestock production in drylands and prompted attempts to reduce woody cover by chemical or mechanical means. Woody encroachment also has the potential to significantly alter terrestrial carbon storage. However, little is known of the long-term biogeochemical consequences of woody encroachment in the broader context of its interaction with common dryland land uses, including "brush management" (woody plant clearing) and livestock grazing. Present assessments exhibit considerable variation in the consequences of these land use/land cover changes, with evidence that brush management may counteract sizeable impacts of shrub encroachment on soil biogeochemical pools. A challenge to assessing the net effects of brush management in shrub-encroached grasslands on soil organic carbon (SOC) and total nitrogen (N) pools is that land management practices are typically considered in isolation, when they are co-occurring phenomena. Furthermore, few studies have assessed spatial patterns in brush management and how these are affected in decades following treatment on sites with contrasting grazing histories. To address these uncertainties and interactions, we quantified the impacts of shrub encroachment and their subsequent mortality resulting from brush management (herbicide application) on SOC and N pools in a Sonoran Desert grassland where long-term grazing manipulations (>100 y) co-occur with shrub encroachment and brush management. Pools of SOC and N associated with herbicided shrubs declined markedly over ~40 years, offsetting 66% of the increases from shrub encroachment. However, spatial patterns in SOC induced by shrubs persisted over the decades following brush management. Century-long protection from grazing did little to change SOC and N pools. Accordingly, shrub encroachment and shrub mortality from brush management each far outweighed livestock grazing impacts. Consideration of the patterns of SOC and N through space (e.g., bole-to-dripline gradients), time (e.g., shrub age/size), land use (e.g., livestock grazing and brush management) and their interactions will position us to improve predictions of SOC and N responses to land use/land cover change, inform C-based management decisions, and objectively evaluate trade-offs with other ecosystem services.
He-accreting carbon-oxygen white dwarfs and Type Ia supernovae
<p>MESA inlists associated with <a href="https://ui.adsabs.harvard.edu/?#abs/2017MNRAS.472.1593W">He-accreting carbon-oxygen white dwarfs and Type Ia supernovae</a></p>
Soil organic carbon in drylands: shrub encroachment and vegetation management effects dwarf those of livestock grazing
Open the record for dataset details and reuse information.
Residual Carbon in Oxygen–Neon White Dwarfs and Its Implications for Accretion-induced Collapse
<p>MESA inlists associated with <a href="http://adsabs.harvard.edu/abs/2019ApJ...872..131S">Schwab & Rocha (2019)</a>. MESA version r9793 and r10108.</p>
Microgravity effects on leaf morphology, cell structure, carbon metabolism and mRNA expression of dwarf wheat
The PESTO experiment was launched on April 8, 2002 onboard STS-110 (Atlantis) and was returned on June 19, 2002 onboard STS-111 (Endeavor), a total of 73 days in space. The ground control was conducted on a 14-day delay, and was harvested on July 3, 2002. During this period there were a total of 7 harvests of PESTO wheat and priming of 6 wheat root modules on orbit. A total of 18 plants were fixed on orbit for morphological and structural analysis, 4 plants were fixed for RNA and molecular genetic analysis and greater than 150 plants were frozen for biochemical analysis. A total of 3018 images of wheat chambers were collected from the BPS cameras during flight, and 3,640 images were obtained from the ground controls. A total of 65 digital images of the wheat harvest were collected during flight, with 75 being collected from ground controls. In addition, crew members recorded approximately 50 images and over 3 hrs of video of flight operations. Over 2 gigabytes of environmental data were obtained from the flight and ground control units. A ground control experiment was conducted in the BPS ground control chamber in the Orbiter Environment Simulator (OES) at the Kennedy Space Center Launch Site Support Facility in Hangar L. The ground control was delayed by 14-days from the real- time flight operations in order to duplicate the flight operations as closely as possible in a 1 g environment. At launch, two chambers were dedicated to the PESTO study, which consisted of three growth cycles using Apogee wheat. The third chamber was dedicated to the TVT study for the first growth cycle and used Apogee wheat. For the subsequent two wheat growth cycles, the third chamber was used for the PESTO study. For the first growth cycle in all Plant Growth Chambers, seeds were germinated pre-launch. In PESTO, the ages of the plants were staggered at launch so that comparisons of physiological and biochemical properties between mature plants, which were well developed and photosynthetically competent, and young plants could be studied. In-flight, plants were harvested at a specific age, and the initiation of the next cycle of growth was staggered between the chambers
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