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  • Alfred Wegener Institute for Polar and Marine Research  (5)
  • EUCOP4  (2)
  • Dessau-Roßlau : Umweltbundesamt
  • 2010-2014  (8)
  • 2014  (8)
  • 1
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    Spatial variability of aircraft-measured surface energy fluxes in permafrost landscapes (2014)
    EUCOP4
    In:  EPIC34th European Conference on Permafrost, Évora, Portugal, 2014-06-18-2014-06-21Lisboa, EUCOP4
    Details
    Publication Date: 2017-10-17
    Description: Arctic ecosystems are undergoing a very rapid change due to global warming and their response to climate change has important implications for the global energy budget. Therefore, it is crucial to understand how energy fluxes in the Arctic will respond to any changes in climate related parameters. However, attribution of these responses is challenging because measured fluxes are the sum of multiple processes that respond differently to environmental factors. Here, we present the potential of environmental response functions for quantitatively linking energy flux observations over high latitude permafrost wetlands to environmental drivers in the flux footprints. We used the research aircraft POLAR 5 equipped with a turbulence probe and fast temperature and humidity sensors to measure turbulent energy fluxes along flight tracks across the Alaskan North Slope with the aim to extrapolate the airborne eddy covariance flux measurements from their specific footprint to the entire North Slope. After thorough data pre-processing, wavelet transforms are used to improve spatial discretization of flux observations in order to relate them to biophysically relevant surface properties in the flux footprint. Boosted regression trees are then employed to extract and quantify the functional relationships between the energy fluxes and environmental drivers. Finally, the resulting environmental response functions are used to extrapolate the sensible heat and water vapor exchange over spatio-temporally explicit grids of the Alaskan North Slope. Additionally, simulations from the Weather Research and Forecasting (WRF) model were used to explore the dynamics of the atmospheric boundary layer and to examine results of our extrapolation.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 2
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    Regional scale assessment of methane emission from Arctic permafrost for improving process-based models (2014)
    EUCOP4
    In:  EPIC34th European Conference on Permafrost, Évora, Portugal, 2014-06-18-2014-06-21Lisboa, EUCOP4
    Details
    Publication Date: 2017-10-17
    Description: Wetlands are the dominant natural source of methane release on a global scale. Estimates about the contribution of Arctic permafrost wetlands to the emission are still uncertain and need further assessment. A reason for that variability is the heterogeneity of the Arctic permafrost landscapes. They extend over large areas and are characterized by varying environmental properties like land cover, surface temperature or soil water content. With chamber and tower measurements, exchange processes of matter fluxes have been measured for decades and have contributed to our understanding of the underlying processes. These results give an idea about possible changes in the future related to changing climatic conditions. For conclusions on a regional scale, however, these measurements cannot represent the true spatial variability of these fluxes, due to their local quality. Regional information about the fluxes, especially carbon fluxes, is indispensable for assessing and predicting the climatic importance of the Arctic permafrost regions. Therefore, regional flux information can help to develop large-scale prediction models for the Arctic. To overcome this spatial limitation we use airborne measurements. During the Airborne Measurements of Methane Fluxes (AIRMETH) campaigns we conducted low level flights across the North Slope of Alaska and the Mackenzie Delta in Canada in the summers of 2012 and 2013. A combination of mechanistic and data-driven analysis tools allows us to relate the measured methane fluxes to spatio-temporally resolved surface properties and basic meteorological information. The aim is to develop a predictive model that produces maps of methane emissions, based on the spatial variation of the land surface and meteorological states. Here we will show first results from the campaigns conducted in the Mackenzie Delta in 2012 and 2013.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 3
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    The Expedition PS82 of the Research Vessel POLARSTERN to the southern Weddell Sea in 2013/2014 (2014)
    Alfred Wegener Institute for Polar and Marine Research
    In:  EPIC3Berichte zur Polar- und Meeresforschung = Reports on polar and marine research, Bremerhaven, Alfred Wegener Institute for Polar and Marine Research, 680, 155 p., ISSN: 1866-3192
    Details
    Publication Date: 2018-09-12
    Repository Name: EPIC Alfred Wegener Institut
    Type: "Berichte zur Polar- und Meeresforschung" , notRev
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  • 4
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    The expedition of the research vessel "Polarstern" to the Antarctic in 2013 (ANT-XXIX/6) (2014)
    Alfred Wegener Institute for Polar and Marine Research
    In:  EPIC3Berichte zur Polar- und Meeresforschung = Reports on polar and marine research, Bremerhaven, Alfred Wegener Institute for Polar and Marine Research, 679, 154 p., ISSN: 1866-3192
    Details
    Publication Date: 2018-09-12
    Repository Name: EPIC Alfred Wegener Institut
    Type: "Berichte zur Polar- und Meeresforschung" , notRev
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  • 5
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    The Expedition PS83 of the Research Vessel POLARSTERN to the Atlantic Ocean in 2014 (2014)
    Alfred Wegener Institute for Polar and Marine Research
    In:  EPIC3Berichte zur Polar- und Meeresforschung = Reports on polar and marine research, Bremerhaven, Alfred Wegener Institute for Polar and Marine Research, 683, 78 p., ISSN: 1866-3192
    Details
    Publication Date: 2018-09-12
    Repository Name: EPIC Alfred Wegener Institut
    Type: "Berichte zur Polar- und Meeresforschung" , notRev
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  • 6
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    The expedition of the research vessel "Polarstern" to the Antarctic in 2013 (ANT-XXIX/7) (2014)
    Alfred Wegener Institute for Polar and Marine Research
    In:  EPIC3Berichte zur Polar- und Meeresforschung = Reports on polar and marine research, Bremerhaven, Alfred Wegener Institute for Polar and Marine Research, 674, 130 p., ISSN: 1866-3192
    Details
    Publication Date: 2018-09-12
    Repository Name: EPIC Alfred Wegener Institut
    Type: "Berichte zur Polar- und Meeresforschung" , notRev
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  • 7
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    Expeditionsprogramm Polarstern Nr. 93 PS84, PS85, PS86, PS87 (ARK-XXVIII/1-4), (2014)
    Alfred Wegener Institute for Polar and Marine Research
    In:  EPIC3Expeditionsprogramm Polarstern, Bremerhaven, Alfred Wegener Institute for Polar and Marine Research, 93, 98 p.
    Details
    Publication Date: 2015-06-21
    Repository Name: EPIC Alfred Wegener Institut
    Type: Expedition program , notRev
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  • 8
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    Kosten- und Modellvergleich langfristiger Klimaschutzpfade (bis 2050) : Endbericht (2014)
    Dessau-Roßlau : Umweltbundesamt
    Details
    Publication Date: 2022-02-18
    Description: Zielsetzung des Forschungsprojektes war es, Klimaschutzszenarien für Deutschland zu entwickeln, die hinsichtlich ihres klimapolitischen Ziels, d.h. ihres langfristigen Emissionsminderungsbeitrags, im Wesentlichen gleich sind, die aber zum Teil auf unterschiedliche Optionen zur Reduktion der energiebedingten CO2-Emissionen setzen. Diese Klimaschutzszenarien wurden hinsichtlich sozioökonomischer und ökologischer Kriterien evaluiert und miteinander verglichen.
    Keywords: ddc:600
    Repository Name: Wuppertal Institut für Klima, Umwelt, Energie
    Language: German
    Type: report , doc-type:report
    Format: application/pdf
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