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  • 1
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    Multi-Decadal Changes in Tundra Environments and Ecosystems: Synthesis of the International Polar Year-Back to the Future Project (IPY-BTF) (2011)
    Springer
    In:  AMBIO, 40 (6). pp. 705-716.
    Details
    Publication Date: 2014-05-07
    Description: Understanding the responses of tundra systems to global change has global implications. Most tundra regions lack sustained environmental monitoring and one of the only ways to document multi-decadal change is to resample historic research sites. The International Polar Year (IPY) provided a unique opportunity for such research through the Back to the Future (BTF) project (IPY project #512). This article synthesizes the results from 13 papers within this Ambio Special Issue. Abiotic changes include glacial recession in the Altai Mountains, Russia; increased snow depth and hardness, permafrost warming, and increased growing season length in sub-arctic Sweden; drying of ponds in Greenland; increased nutrient availability in Alaskan tundra ponds, and warming at most locations studied. Biotic changes ranged from relatively minor plant community change at two sites in Greenland to moderate change in the Yukon, and to dramatic increases in shrub and tree density on Herschel Island, and in sub-arctic Sweden. The population of geese tripled at one site in northeast Greenland where biomass in non-grazed plots doubled. A model parameterized using results from a BTF study forecasts substantial declines in all snowbeds and increases in shrub tundra on Niwot Ridge, Colorado over the next century. In general, results support and provide improved capacities for validating experimental manipulation, remote sensing, and modeling studies
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/s13280-011-0179-8
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    The rapid and precise computation of GPS slant total delays and mapping factors utilizing a numerical weather model (2014)
    Wiley-Blackwell
    Details
    Publication Date: 2014-02-25
    Description: [1]  In a previous study we developed an elegant technique to compute the signal travel time delay due to the neutral atmosphere, also known as Slant Total Delay (STD), between a Global Positioning System (GPS) satellite and a ground-based receiver utilizing data from a Numerical Weather Model (NWM). Currently, we make use of NWM data from the Global Forecast System (GFS) because short range forecasts are easily accessible. In this study we introduce some modifications which double the speed of our algorithm without altering its precision; on an ordinary PC (using a single core) we compute about 2000 STDs per second with a precision of about 1 mm. The data throughput and precision are independent of the vacuum elevation (azimuth) angle of the receiver satellite link. Hence the algorithm allows the computation of STDs in a meso-beta scale NWM with an unprecedented speed and precision. A practical by-product of the algorithm is introduced as well; the Potsdam Mapping Factors (PMFs), which are generated by fast direct mapping utilizing short range GFS forecasts. In fact, it appears that the PMFs make the application of parameterized mapping in GPS processing obsolete.
    Print ISSN: 0048-6604
    Electronic ISSN: 1944-799X
    Topics: Geosciences , Physics
    Published by Wiley-Blackwell on behalf of American Geophysical Union (AGU).
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    PAPER CURRENT
  • 3
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    Glutathione redox potential in the mitochondrial intermembrane space is linked to the cytosol and impacts the Mia40 redox state (2012)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2012-07-19
    Description: Glutathione redox potential in the mitochondrial intermembrane space is linked to the cytosol and impacts the Mia40 redox state The EMBO Journal 31, 3169 (2012). doi:10.1038/emboj.2012.165 Authors: Kerstin Kojer, Melanie Bien, Heike Gangel, Bruce Morgan, Tobias P Dick & Jan Riemer Glutathione is an important mediator and regulator of cellular redox processes. Detailed knowledge of local glutathione redox potential (EGSH) dynamics is critical to understand the network of redox processes and their influence on cellular function. Using dynamic oxidant recovery assays together with E
    Keywords: glutathioneMia40mitochondrial intermembrane spaceporinroGFP
    Print ISSN: 0261-4189
    Electronic ISSN: 1460-2075
    Topics: Biology , Medicine
    Published by Nature Publishing Group (NPG) on behalf of The European Molecular Biology Organization (EMBO).
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    PAPER CURRENT
  • 4
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    SoilTemp: a global database of near‐surface temperature (2020)
    Wiley
    In:  EPIC3Global Change Biology, Wiley, ISSN: 1354-1013
    Details
    Publication Date: 2020-04-22
    Description: Current analyses and predictions of spatially‐explicit patterns and processes in ecology most often rely on climate data interpolated from standardized weather stations. This interpolated climate data represents long‐term average thermal conditions at coarse spatial resolutions only. Hence, many climate‐forcing factors that operate at fine spatiotemporal resolutions are overlooked. This is particularly important in relation to effects of observation height (e.g. vegetation, snow and soil characteristics) and in habitats varying in their exposure to radiation, moisture and wind (e.g. topography, radiative forcing, or cold‐air pooling). Since organisms living close to the ground relate more strongly to these microclimatic conditions than to free‐air temperatures, microclimatic ground and near‐surface data are needed to provide realistic forecasts of the fate of such organisms under anthropogenic climate change, as well as of the functioning of the ecosystems they live in. To fill this critical gap, we highlight a call for temperature time series submissions to SoilTemp, a geospatial database initiative compiling soil and near‐surface temperature data from all over the world. Currently this database contains time series from 7538 temperature sensors from 51 countries across all key biomes. The database will pave the way towards an improved global understanding of microclimate and bridge the gap between the available climate data and the climate at fine spatiotemporal resolutions relevant to most organisms and ecosystem processes.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Miscellaneous , notRev
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    PAPER (OA)
  • 5
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    (Table 2) Temporal changes in phenological observations between 1978 and 2007, northern Sweden (2011)
    PANGAEA
    In:  Supplement to: Andrews, Christopher; Dick, Jan; Jonasson, Christer; Callaghan, Terry V (2011): Assessment of biological and environmental phenology at a landscape level from 30 years of fixed-date repeat photography in northern Sweden. AMBIO, 40(6), 600-609, https://doi.org/10.1007/s13280-011-0167-z
    Details
    Publication Date: 2023-12-13
    Description: A 30-year series (1978-2007) of photographic records were analysed to determine changes in lake ice cover, local (low elevation) and montane (high elevation) snow cover and phenological stages of mountain birch (Betula pubescens ssp. czerepanovii) at the Abisko Scientific Research Station, Sweden. In most cases, the photographic-derived data showed no significant difference in phenophase score from manually observed field records from the same period, demonstrating the accuracy and potential of using weekly repeat photography as a quicker, cheaper and more adaptable tool to remotely study phenology in both biological and physical systems. Overall, increases in ambient temperatures coupled with decreases in winter ice and snow cover, and earlier occurrence of birch foliage, signal a reduction in the length of winter, a shift towards earlier springs and an increase in the length of available growing season in the Swedish sub-arctic.
    Keywords: Abisko_ANSt; Abisko, Lappland, northern Sweden; DATE/TIME; Difference; International Polar Year (2007-2008); IPY; Number; Observation; Photo/Video; Photography; PV; Standard error
    Type: Dataset
    Format: text/tab-separated-values, 45 data points
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    DATA PANGAEA
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