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  • 1
    Online Resource
    Online Resource
    Constraining uncertainty in climate sensitivity : an ensemble simulation approach based on glacial climate (2006)
    Potsdam
    Details
    UID:
    gbv_515341576
    Format: Online-Ressource , Online-Ressource (107 S.) , graph. Darst
    Content: Eine der entscheidenden Hauptquellen für Unsicherheiten von Klimaprojektionen ist, wie sensitiv das Klimasystem auf Änderungen der Strahlungsbilanz der Erde reagiert. Angesichts des kontinuierlichen Anstiegs der atmosphärischen Treibhausgaskonzentrationen ist die Einschränkung des Unsicherheitsbereichs dieser Sensitivität von entscheidender Bedeutung. Ein häufig verwendetes Maß zur Beschreibung dieser charakteristischen Kenngröße von Klimamodellen ist die sogenannte Klimasensitivität, definiert als die Gleichgewichtsänderung der simulierten globalen Mitteltemperatur, welche sich aus einer Verdoppelung des atmosphärischen CO2-Gehalts ergibt...
    Note: Potsdam, Univ., Diss., 2006
    Language: English
    Keywords: Hochschulschrift
    URN: urn:nbn:de:kobv:517-opus-7778
    URL: Volltext
    URL: Volltext
    URL: Volltext
    URL: Volltext
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    Online Access
    UB Potsdam
  • 2
    Book
    Book
    Constraining uncertainty in climate sensitivity : An ensemble simulation approach based on glacial climate (2006)
    Potsdam
    Details
    UID:
    kobvindex_GFZ100361
    Format: 107 S.
    Note: MAB0014.001: PIK M 311-06-0383 , Thesis
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    Book
    Wissenschaftspark Albert Einstein get availability status
  • 3
    Book
    Book
    Constraining uncertainty in climate sensitivity : an ensemble simulation approach based on glacial climate (2006)
    Potsdam
    Details
    UID:
    gbv_52021546X
    Format: 107 S , graph. Darst
    Note: Potsdam, Univ., Diss., 2006
    Language: English
    Keywords: Hochschulschrift
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    UB Potsdam get availability status
  • 4
    Online Resource
    Online Resource
    First Quantification of the Permafrost Heat Sink in the Earth's Climate System (2023)
    Berlin : Humboldt-Universität zu Berlin
    Details
    UID:
    edochu_18452_27651
    Format: 1 Online-Ressource (11 Seiten)
    ISSN: 0094-8276 , 1944-8007 , 0094-8276 , 1944-8007
    Content: Due to an imbalance between incoming and outgoing radiation at the top of the atmosphere, excess heat has accumulated in Earth's climate system in recent decades, driving global warming and climatic changes. To date, it has not been quantified how much of this excess heat is used to melt ground ice in permafrost. Here, we diagnose changes in sensible and latent ground heat contents in the northern terrestrial permafrost region from ensemble-simulations of a tailored land surface model. We find that between 1980 and 2018, about 3.9^+1.4_-1.6 ZJ of heat, of which 1.7_-1.4^+1.3 ZJ (44%) were used to melt ground ice, were absorbed by permafrost. Our estimate, which does not yet account for the potentially increased heat uptake due to thermokarst processes in ice-rich terrain, suggests that permafrost is a persistent heat sink comparable in magnitude to other components of the cryosphere and must be explicitly considered when assessing Earth's energy imbalance.
    Content: Peer Reviewed
    In: Hoboken, NJ : Wiley, 50,12, 0094-8276
    In: 1944-8007
    Language: English
    DOI: 10.18452/26963
    DOI: 10.1029/2022GL102053
    URN: urn:nbn:de:kobv:11-110-18452/27651-7
    URL: Volltext  (kostenfrei)
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    Online Resource
    Fulltext
    HU Berlin
  • 5
    Online Resource
    Online Resource
    Variability of the surface energy balance in permafrost-underlain boreal forest (2021)
    Berlin : Humboldt-Universität zu Berlin
    Details
    UID:
    edochu_18452_29919
    Format: 1 Online-Ressource (23 Seiten)
    Content: Boreal forests in permafrost regions make up around one-third of the global forest cover and are an essential component of regional and global climate patterns. Further, climatic change can trigger extensive ecosystem shifts such as the partial disappearance of near-surface permafrost or changes to the vegetation structure and composition. Therefore, our aim is to understand how the interactions between the vegetation, permafrost and the atmosphere stabilize the forests and the underlying permafrost. Existing model setups are often static or are not able to capture important processes such as the vertical structure or the leaf physiological properties. There is a need for a physically based model with a robust radiative transfer scheme through the canopy. A one-dimensional land surface model (CryoGrid) is adapted for the application in vegetated areas by coupling a multilayer canopy model (CLM-ml v0; Community Land Model) and is used to reproduce the energy transfer and thermal regime at a study site (63.18946∘ N, 118.19596∘ E) in mixed boreal forest in eastern Siberia. An extensive comparison between measured and modeled energy balance variables reveals a satisfactory model performance justifying its application to investigate the thermal regime; surface energy balance; and the vertical exchange of radiation, heat and water in this complex ecosystem. We find that the forests exert a strong control on the thermal state of permafrost through changing the radiation balance and snow cover phenology. The forest cover alters the surface energy balance by inhibiting over 90 % of the solar radiation and suppressing turbulent heat fluxes. Additionally, our simulations reveal a surplus in longwave radiation trapped below the canopy, similar to a greenhouse, which leads to a magnitude in storage heat flux comparable to that simulated at the grassland site. Further, the end of season snow cover is 3 times greater at the forest site, and the onset of the snow-melting processes are delayed.
    Content: Peer Reviewed
    In: Katlenburg-Lindau [u.a.] : Copernicus, 18,2, Seiten 343-365
    Language: English
    DOI: 10.18452/29294
    DOI: 10.5194/bg-18-343-2021
    URN: urn:nbn:de:kobv:11-110-18452/29919-0
    URL: Volltext  (kostenfrei)
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    HU Berlin
  • 6
    Online Resource
    Online Resource
    Effects of multi-scale heterogeneity on the simulated evolution of ice-rich permafrost lowlands under a warming climate (2021)
    Berlin : Humboldt-Universität zu Berlin
    Details
    UID:
    edochu_18452_29981
    Format: 1 Online-Ressource (24 Seiten)
    Content: In continuous permafrost lowlands, thawing of ice-rich deposits and melting of massive ground ice lead to abrupt landscape changes called thermokarst, which have widespread consequences on the thermal, hydrological, and biogeochemical state of the subsurface. However, macro-scale land surface models (LSMs) do not resolve such localized subgrid-scale processes and could hence miss key feedback mechanisms and complexities which affect permafrost degradation and the potential liberation of soil organic carbon in high latitudes. Here, we extend the CryoGrid 3 permafrost model with a multi-scale tiling scheme which represents the spatial heterogeneities of surface and subsurface conditions in ice-rich permafrost lowlands. We conducted numerical simulations using stylized model setups to assess how different representations of micro- and meso-scale heterogeneities affect landscape evolution pathways and the amount of permafrost degradation in response to climate warming. At the micro-scale, the terrain was assumed to be either homogeneous or composed of ice-wedge polygons, and at the meso-scale it was assumed to be either homogeneous or resembling a low-gradient slope. We found that by using different model setups and parameter sets, a multitude of landscape evolution pathways could be simulated which correspond well to observed thermokarst landscape dynamics across the Arctic. These pathways include the formation, growth, and gradual drainage of thaw lakes; the transition from low-centred to high-centred ice-wedge polygons; and the formation of landscape-wide drainage systems due to melting of ice wedges. Moreover, we identified several feedback mechanisms due to lateral transport processes which either stabilize or destabilize the thermokarst terrain. The amount of permafrost degradation in response to climate warming was found to depend primarily on the prevailing hydrological conditions, which in turn are crucially affected by whether or not micro- and/or meso-scale heterogeneities were considered in the model setup. Our results suggest that the multi-scale tiling scheme allows for simulating ice-rich permafrost landscape dynamics in a more realistic way than simplistic one-dimensional models and thus facilitates more robust assessments of permafrost degradation pathways in response to climate warming. Our modelling work improves the understanding of how micro- and meso-scale processes affect the evolution of ice-rich permafrost landscapes, and it informs macro-scale modellers focusing on high-latitude land surface processes about the necessities and possibilities for the inclusion of subgrid-scale processes such as thermokarst within their models.
    Content: Peer Reviewed
    In: Katlenburg-Lindau : Copernicus, 15,3, Seiten 1399-1422
    Language: English
    DOI: 10.18452/29364
    DOI: 10.5194/tc-15-1399-2021
    URN: urn:nbn:de:kobv:11-110-18452/29981-2
    URL: Volltext  (kostenfrei)
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    HU Berlin
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