ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

You have 0 saved results.
Mark results and click the "Add To Watchlist" link in order to add them to this list.
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Publication Date: 2019-02-01
    Description: The large variety of atmospheric circulation systems affecting the eastern Asian climate is reflected by the complex Asian vegetation distribution. Particularly in the transition zones of these circulation systems, vegetation is supposed to be very sensitive to climate change. Since proxy records are scarce, hitherto a mechanistic understanding of the past spatio-temporal climate–vegetation relationship is lacking. To assess the Holocene vegetation change and to obtain an ensemble of potential mid-Holocene biome distributions for eastern Asia, we forced the diagnostic biome model BIOME4 with climate anomalies of different transient Holocene climate simulations performed in coupled atmosphere–ocean(–vegetation) models. The simulated biome changes are compared with pollen-based biome records for different key regions. In all simulations, substantial biome shifts during the last 6000 years are confined to the high northern latitudes and the monsoon–westerly wind transition zone, but the temporal evolution and amplitude of change strongly depend on the climate forcing. Large parts of the southern tundra are replaced by taiga during the mid-Holocene due to a warmer growing season and the boreal treeline in northern Asia is shifted northward by approx. 4° in the ensemble mean, ranging from 1.5 to 6° in the individual simulations, respectively. This simulated treeline shift is in agreement with pollen-based reconstructions from northern Siberia. The desert fraction in the transition zone is reduced by 21 % during the mid-Holocene compared to pre-industrial due to enhanced precipitation. The desert–steppe margin is shifted westward by 5° (1–9° in the individual simulations). The forest biomes are expanded north-westward by 2°, ranging from 0 to 4° in the single simulations. These results corroborate pollen-based reconstructions indicating an extended forest area in north-central China during the mid-Holocene. According to the model, the forest-to-non-forest and steppe-to-desert changes in the climate transition zones are spatially not uniform and not linear since the mid-Holocene.
    Type: Article , PeerReviewed
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    Publication Date: 2019-02-01
    Description: The pre-industrial millennium is among the periods selected by the Paleoclimate Model Intercomparison Project (PMIP) for experiments contributing to the sixth phase of the Coupled Model Intercomparison Project (CMIP6) and the fourth phase of the PMIP (PMIP4). The past1000 transient simulations serve to investigate the response to (mainly) natural forcing under background conditions not too different from today, and to discriminate between forced and internally generated variability on interannual to centennial timescales. This paper describes the motivation and the experimental set-ups for the PMIP4-CMIP6 past1000 simulations, and discusses the forcing agents orbital, solar, volcanic, and land use/land cover changes, and variations in greenhouse gas concentrations. The past1000 simulations covering the pre-industrial millennium from 850 Common Era (CE) to 1849 CE have to be complemented by historical simulations (1850 to 2014 CE) following the CMIP6 protocol. The external forcings for the past1000 experiments have been adapted to provide a seamless transition across these time periods. Protocols for the past1000 simulations have been divided into three tiers. A default forcing data set has been defined for the Tier 1 (the CMIP6 past1000) experiment. However, the PMIP community has maintained the flexibility to conduct coordinated sensitivity experiments to explore uncertainty in forcing reconstructions as well as parameter uncertainty in dedicated Tier 2 simulations. Additional experiments (Tier 3) are defined to foster collaborative model experiments focusing on the early instrumental period and to extend the temporal range and the scope of the simulations. This paper outlines current and future research foci and common analyses for collaborative work between the PMIP and the observational communities (reconstructions, instrumental data).
    Type: Article , PeerReviewed
    Format: text
    Format: archive
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 3
    facet.materialart.
    Unknown
    Hannover: Verlag der ARL - Akademie für Raumforschung und Landesplanung
    Publication Date: 2016-11-24
    Description: Production of renewable energy by photovoltaics or biomass is connected with high land consumption. Limited potential of suitable area in conjunction with the challenge to contend with substitution of high energy demand produced by fossil fuels calls for a substantially determined data basis as well as a regionally differentiated view and governance to ensure proper allocation of landusage. With the help of examples from (Upper) Bavaria it is possible to show effects of existing instruments of governance and to develop possibilities of their modified application.
    Description: Die Erzeugung regenerativer Energien mit Photovoltaik oder Biomasse ist mit einem hohen Flächenbedarf verbunden. Das begrenzte Potenzial dafür geeigneter Flächen in Verbindung mit der Herausforderung, den hohen Energiebedarf substituieren zu müssen, der gegenwärtig durch den Einsatz fossiler Energieträger gedeckt wird, erfordert für eine sachgerechte Verteilung eine substanziell ermittelte Datengrundlage und regional differenzierte Betrachtung sowie Steuerung. Anhand von Beispielen aus (Ober-)Bayern werden Auswirkungen der bisherigen Steuerungsinstrumente aufgezeigt und Perspektiven für einen modifizierten Einsatz entwickelt.
    Keywords: ddc:710 ; Photovoltaik ; Bioenergie ; Nutzungspotenziale ; Flächenbedarf ; Raumplanung
    Repository Name: EconStor: OA server of the German National Library of Economics - Leibniz Information Centre for Economics
    Language: German
    Type: doc-type:bookPart
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 4
    facet.materialart.
    Unknown
    Hannover: Verlag der ARL - Akademie für Raumforschung und Landesplanung
    Publication Date: 2016-11-24
    Description: Klimawandel und Energiewende geht alle an. Die Raumordnung muss dabei im Sinne des Gemeinwohls eine rahmengebende und koordinierende Rolle spielen. Unter der Prämisse einer "klimagerechten Verantwortung" müssen die raumrelevanten Aspekte in den Vordergrund gerückt und eine auf Akzeptanz und Partizipation ausgerichtete strategische Landes- und Regionalplanung gestärkt werden. Gesamträumliche Konzepte wie z. B. regionale Energiekonzepte stellen dabei wichtige Bausteine für eine erfolgreiche Umsetzung der Energiewende dar. Die zahlreichen Instrumente der Raumordnung sollten zwar einer Neubewertung bezüglich der neuen Herausforderungen (Klimawandel, Energiewende) unterzogen werden, können aber - allerdings nur bei konsequenter Anwendung - wichtige Weichen stellen (z. B. zu einer klimagerechten Siedlungsentwicklung). In diesem Sinne werden von den einzelnen Autoren in diesem Band umsetzungsorientierte Handlungsempfehlungen gegeben und konkrete Vorschläge zur Weiterentwicklung der Raumordnung und zu ihren Instrumenten aufgezeigt (z. B. Schaffung einer Koordinierungsstelle, Erweiterung von Instrumenten der Freiraumsicherung, "Klima- Check" in Raumordnungsverfahren). Die Zielsetzung der Arbeitsgruppe war es, über die einzelnen in schriftlicher Form niedergelegten Beiträge hinaus, auf allen Planungs- und Entscheidungsebenen weitere Diskussionen und klimagerechtes Handeln anzuregen. Nur im Schulterschluss der Kommunen und Verbände, der Gesellschaft und des Staates sowie mit einer Verknüpfung formeller und informeller Instrumente wird es gelingen, dem Klimawandel zu begegnen und eine erfolgreiche Umsetzung der Energiewende zu bewirken.
    Description: Climate change and energy turnaround is everyone's business. Spatial planning therefore has to play a mayor role in providing a framework and coordination on behalf of the common good. Under the premise of climate-optimized responsibility space-relevant aspects has to be promoted und strategic regional planning based on acceptance and participation has to be enforced. Spatially holistic concepts, like regional energy concepts, are important components for a successful replacement of fossil fuels. Numerous instruments for spatial planning has to be re-evaluated facing new challenges, but providing consistent application they could set the right course (f. e. climate-conscious settlement development). In this sense, the authors in this book give implementationorientated recommendations for action and present concrete proposals developing spatial planning as well as its instruments (f. e. creation of coordination office, expansion of instruments for securing open spaces, climate-check for regional planning procedures). Besides working out the papers, it was the objective of the working group to encourage discussion on all planning and decision-making levels and to inspire climate-optimized acting. Dealing with climate change and a successful substitution of fossil energy will only come about if there exists a united front between municipalities, associations, society and state as well as a combination of formal and informal instruments.
    Keywords: ddc:710 ; Klimawandel ; regenerative Energien ; Energiewende ; Raumordnung ; Handlungsempfehlungen
    Repository Name: EconStor: OA server of the German National Library of Economics - Leibniz Information Centre for Economics
    Language: German
    Type: doc-type:bookPart
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 5
    facet.materialart.
    Unknown
    Frankfurt a. M.: Goethe University Frankfurt, SAFE - Sustainable Architecture for Finance in Europe
    Publication Date: 2019-01-15
    Description: We show that the optimal consumption of an individual over the life cycle can have the hump shape (inverted U-shape) observed empirically if the preferences of the individual exhibit internal habit formation. In the absence of habit formation, an impatient individual would prefer a decreasing consumption path over life. However, because of habit formation, a high initial consumption would lead to high required consumption in the future. To cover the future required consumption, wealth is set aside, but the necessary amount decreases with age which allows consumption to increase in the early part of life. At some age, the impatience outweighs the habit concerns so that consumption starts to decrease. We derive the optimal consumption strategy in closed form, deduce sufficient conditions for the presence of a consumption hump, and characterize the age at which the hump occurs. Numerical examples illustrate our findings. We show that our model calibrates well to U.S. consumption data from the Consumer Expenditure Survey.
    Keywords: D91 ; D11 ; D14 ; ddc:330 ; Consumption hump ; life-cycle utility maximization ; habit formation ; impatience
    Repository Name: EconStor: OA server of the German National Library of Economics - Leibniz Information Centre for Economics
    Language: English
    Type: doc-type:workingPaper
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 6
    Publication Date: 2017-03-06
    Description: The large variety of atmospheric circulation systems affecting the eastern Asian climate is reflected by the complex Asian vegetation distribution. Particularly in the transition zones of these circulation systems, vegetation is supposed to be very sensitive to climate change. Since proxy records are scarce, hitherto a mechanistic understanding of the past spatio-temporal climate–vegetation relationship is lacking. To assess the Holocene vegetation change and to obtain an ensemble of potential mid-Holocene biome distributions for eastern Asia, we forced the diagnostic biome model BIOME4 with climate anomalies of different transient Holocene climate simulations performed in coupled atmosphere–ocean(–vegetation) models. The simulated biome changes are compared with pollen-based biome records for different key regions. In all simulations, substantial biome shifts during the last 6000 years are confined to the high northern latitudes and the monsoon–westerly wind transition zone, but the temporal evolution and amplitude of change strongly depend on the climate forcing. Large parts of the southern tundra are replaced by taiga during the mid-Holocene due to a warmer growing season and the boreal treeline in northern Asia is shifted northward by approx. 4° in the ensemble mean, ranging from 1.5 to 6° in the individual simulations, respectively. This simulated treeline shift is in agreement with pollenbased reconstructions from northern Siberia. The desert fraction in the transition zone is reduced by 21% during the mid- Holocene compared to pre-industrial due to enhanced precipitation. The desert–steppe margin is shifted westward by 5° (1–9° in the individual simulations). The forest biomes are expanded north-westward by 2°, ranging from 0 to 4° in the single simulations. These results corroborate pollen-based reconstructions indicating an extended forest area in northcentral China during the mid-Holocene. According to the model, the forest-to-non-forest and steppe-to-desert changes in the climate transition zones are spatially not uniform and not linear since the mid-Holocene.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , NonPeerReviewed
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 7
    facet.materialart.
    Unknown
    PANGAEA
    In:  Supplement to: Varma, Vidya; Prange, Matthias; Merkel, Ute; Kleinen, Thomas; Lohmann, Gerrit; Pfeiffer, Madlene; Renssen, Hans; Wagner, Axel; Wagner, Sebastian; Schulz, Michael (2012): Holocene evolution of the Southern Hemisphere westerly winds in transient simulations with global climate models. Climate of the Past, 8(2), 391-402, https://doi.org/10.5194/cp-8-391-2012
    Publication Date: 2019-05-25
    Description: The Southern Hemisphere Westerly Winds (SWW) have been suggested to exert a critical influence on global climate through wind-driven upwelling of deep water in the Southern Ocean and the potentially resulting atmospheric CO2 variations. The investigation of the temporal and spatial evolution of the SWW along with forcings and feedbacks remains a significant challenge in climate research. In this study, the evolution of the SWW under orbital forcing from the early Holocene (9 kyr BP) to pre-industrial modern times is examined with transient experiments using the comprehensive coupled global climate model CCSM3. Analyses of the model results suggest that the annual and seasonal mean SWW were subject to an overall strengthening and poleward shifting trend during the course of the early-to-late Holocene under the influence of orbital forcing, except for the austral spring season, where the SWW exhibited an opposite trend of shifting towards the equator.
    Type: Dataset
    Format: text/tab-separated-values, 20 data points
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 8
    facet.materialart.
    Unknown
    Wiley
    In:  Annals of the New York Academy of Sciences, 1436 (1). pp. 54-69.
    Publication Date: 2019-07-08
    Description: Regional climate modeling bridges the gap between the coarse resolution of current global climate models and the regional-to-local scales, where the impacts of climate change are of primary interest. Here, we present a review of the added value of the regional climate modeling approach within the scope of paleoclimate research and discuss the current major challenges and perspectives. Two time periods serve as an example: the Holocene, including the Last Millennium, and the Last Glacial Maximum. Reviewing the existing literature reveals the benefits of regional paleo climate modeling, particularly over areas with complex terrain. However, this depends largely on the variable of interest, as the added value of regional modeling arises from a more realistic representation of physical processes and climate feedbacks compared to global climate models, and this affects different climate variables in various ways. In particular, hydrological processes have been shown to be better represented in regional models, and they can deliver more realistic meteorological data to drive ice sheet and glacier modeling. Thus, regional climate models provide a clear benefit to answer fundamental paleoclimate research questions and may be key to advance a meaningful joint interpretation of climate model and proxy data.
    Type: Article , PeerReviewed
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 9
    Publication Date: 2019-07-17
    Description: Past global climate changes had strong regional expression. To elucidate their spatio-temporal pattern, we reconstructed past temperatures for seven continental-scale regions during the past one to two millennia. The most coherent feature in nearly all of the regional temperature reconstructions is a long-term cooling trend, which ended late in the nineteenth century. At multi-decadal to centennial scales, temperature variability shows distinctly different regional patterns, with more similarity within each hemisphere than between them. There were no globally synchronous multi-decadal warm or cold intervals that define a worldwide Medieval Warm Period or Little Ice Age, but all reconstructions show generally cold conditions between ad 1580 and 1880, punctuated in some regions by warm decades during the eighteenth century. The transition to these colder conditions occurred earlier in the Arctic, Europe and Asia than in North America or the Southern Hemisphere regions. Recent warming reversed the long-term cooling; during the period ad 1971–2000, the area-weighted average reconstructed temperature was higher than any other time in nearly 1,400 years.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , NonPeerReviewed
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 10
    Publication Date: 2019-07-25
    Type: Article , NonPeerReviewed
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...