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  • 1
    Call number: PIK N 531-01-0416 ; AWI G1-02-0031
    Type of Medium: Monograph available for loan
    Pages: XVI, 416 Seiten , Illustrationen
    ISBN: 0126312605
    Language: English
    Note: Contents: Contributors. - Foreword by Paul J. Crutzen. - Preface by David Schimel. - Introduction. - 1 Uncertainties of Global Biogeochemical Predictions / E. D. Schulze, D. S. S. Schimel. - 1.1 Introduction. - 1.2 The IGBP Transect Approach. - 1.2.1 The Patagonian Transect. - 1.2.2 The Australian Transect. - 1.2.3 The European Transect. - 1.3 Variability in Processes. - 1.4 Biome Approach and Functional Types. - 1.5 New Approaches to Functional Diversity. - 1.6 Conclusions. - References. - 2 Uncertainties of Global Climate Predictions / L. Bengtsson. - 2.1 Introduction. - 2.2 Observational Evidence. - 2.3 Physical Rationale. - 2.3.1 Stochastic Forcing. - 2.3.2 Solar irradiation Changes. - 2.3.3 Volcanic Effects. - 2.3.4 Anthropogenic Effects. - 2.4 Response to Forcing of the Climate System. - 2.5 Results from Climate Change Prediction Experiments. - 2.6 Summary and Conclusions. - References. - 3 Uncertainties in the Atmospheric Chemical System / G. P. Brasseur, E. A. H. Holland. - 3.1 Introduction. - 3.2 Synthetic View of Chemical Processes in the Troposphere. - 3.3 The IMAGES Model. - 3.4 Changes in the Chemical Composition of the Global Troposphere. - 3.5 Concluding Remarks. - References. - 4 Inferring Biogeochemical Sources and Sinks from Atmospheric Concentrations: General Consideration and Applications in Vegetation Canopies / M. Raupach. - 4.1 Introduction. - 4.2 Scalar and Isotopic Molar Balances. - 4.2.1 General Principles. - 4.2.2 Single-Point Eulerian Equations. - 4.2.3 Source Terms for CO2. - 4.2.4 Single-Point Lagrangian Equations. - 4.3 Inverse Methods for Inferring Scalar Sources and Sinks in Canopies. - 4.3.1 General Principles. - 4.3.2 Localized Near Field Theory. - 4.3.3 The Dispersion Matrix. - 4.3.4 Turbulent Velocity Field. - 4.3.5 Solutions for Forward, Inverse and Implicit Problems. - 4.3.6 Field Tests. - 4.4 Inverse Methods and Isotopes in Canopies. - 4.4.1 Path Integrals and Keeling Plots. - 4.4.2 Inverse Lagrangian Analysis of Isotopic Composition. - 4.5 Summary and Conclusions. - Appendix A. - Appendix B. - References. - 5 Biogeophysical Feedbacks and the Dynamics of Climate / M. Claussen. - 5.1 Introduction. - 5.2 Synergisms. - 5.2.1 High Northern Latitudes. - 5.2.2 Subtropics. - 5.3 Multiple Equilibria. - 5.4 Transient Interaction. - 5.5 Perspectives. - References. - 6 Land-Ocean-Atmosphere Interactions and Monsoon Climate Change: A Paleo-Perspective / J. E. Kutzbach, Michael T. Coe, S. P. Harrison and M. T. Coe. - 6.1 Introduction. - 6.2 Response of the Monsoon to Orbital Forcing. - 6.3 Ocean Feedbacks on the Monsoon. - 6.4 Land-Surface Feedbacks on the Monsoon. - 6.5 Synergies between the Land, Ocean and Atmosphere. - 6.6 The Role of Climate Variability. - 6.7 Final Remarks. - References. - 7 Paleobiogeochemistry / I. C. Prentice, D. Raynaud. - 7.1 Introduction. - 7.2 Methane. - 7.3 Carbon Dioxide. - 7.4 Mineral Dust Aerosol. - 7.5 Scientific Challenges Posed by the Ice-Core Records. - 7.5.1 Methane. - 7.5.2 Carbon Dioxide. - 7.5.3 Mineral Dust Aerosol. - 7.6 Towards an Integrated Research Strategy for Palaeobiogeochemistry. - References. - 8 Should Phosphorus Availability Be Constraining Moist Tropical Forest Responses to Increasing CO2 Concentrations / J. Lloyd, M. I. Bird, E. M. Veenendaal and B. Kruijt. - 8.1 Introduction. - 8.2 Phosphorus in the Soils of the Moist Tropics. - 8.2.1 Soil Organic Phosphorus. - 8.2.2 Soil Inorganic Phosphorus. - 8.2.3 Soil Carbon/Phosphorus Interactions. - 8.3 States and Fluxes of Phosphorus in Moist Tropical Forests. - 8.3.1 Inputs and Losses of Phosphorus Through Rainfall, Dry Deposition and Weathering: Losses Via Leaching. - 8.3.2 Internal Phosphorus Flows in Moist Tropical Forests. - 8.3.3 Mechanisms for Enhanced Phosphorus Uptake in Low P Soils. - 8.4 Linking the Phosphorus and Carbon Cycles. - 8.4.1 To What Extent Does Phosphorus Availability Really Limit Moist Tropical Forest Productivity?. - 8.4.2 Tropical Plant Responses to Increases in Atmospheric CO2 Concentrations. - 8.4.3 Using a Simple Model to Examine CO2/Phosphorus Interactions in Tropical Forests. - References. - 9 Trees in Grasslands: Biogeochemical Consequences of Woody Plant Expansion / S. Archer, T. W. Boutton and K. A. Hibbard. - 9.1 Introduction. - 9.2 Woody Plant Encroachment in Grasslands and Savannas. - 9.3 The La Copita Case Study. - 9.3.1 Biogeographical and Historal Context. - 9.3.2 Herbaceous Retrogression and Soil Carbon Losses. - 9.3.3 Woody Plant Encroachment and Ecosystem Biogeochemistry. - 9.4 Degradation: Ecological Versus Socioeconomic. - 9.5 Implications for Ecosystem and Natural Resources Management. - 9.6 Summary. - References. - 10 Biogeochemistry in the Arctic: Patterns, Processes and Controls / S. Jonasson, F.S. Chapin, III and G. R. Shaver. - 10.1 Introduction. - 10.2 Tundra Organic Matter. - 10.2.1 Distribution of Organic Matter. - 10.2.2 Patterns and Controls of Organic Matter Turnover between Ecosystem Types. - 10.3 Tundra Nutrients. - 10.3.1 Nutrient Distribution and Controls of Nutrient Cycling. - 10.3.2 Nutrient Mineralization and Plant Nutrient Uptake. - 10.3.3 Are there Unaccounted Plant Sources of Limiting Nutrients?. - 10.4 Biogeochemical Responses to Experimental Ecosystem Manipulations. - 10.4.1 Applicability of Experimental Manipulations. - 10.4.2 Responses to Water Applications. - 10.4.3 Response to Nutrient Addition and Warming. - 10.4.4 Responses in Ecosystem Carbon Balance. - 10.5 Summary. - References. - 11 Evaporation in the Boreal Zone During Summer - Physics and Vegetation / F. M. Kelliher, I. Lloyd, C. Rebmann, C. Wirth and E. D. Schulze, D. D. Baldocchi. - 11.1 Introduction. - 11.2 Climate and Soil Water. - 11.3 Evaporation Theory. - 11.4 Evaporation During Summer and Rainfall. - 11.5 Forest Evaporation, Tree Life Form and Nitrogen. - 11.6 Conclusions. - References. - 12 Past and Future Forest Response to Rapid Climate Change / M.B. Davis. - 12.1 Introduction. - 12.2 Long-Distance Dispersal. - 12.3 Estimating Jump Distances. - 12.4 Interactions with Resident Vegetation - Constraints on Establishment. - 12.5 Interactions with Resident Vegetation - Competition for Light and Resulting Constraints on Population Growth. - 12.6 Conclusions. - References. - 13 Biogeochemical Models: Implicit vs. Explicit Microbiology / J. Schimel. - 13.1 Introduction. - 13.2 Microbiology in Biogeochemical Models. - 13.3 Dealing with Microbial Diversity in Models. - 13.4 Kinetic Effects of Microbial Population Size. - 13.5 Microbial Recovery from Stress. - 13.6 Conclusions. - References. - 14 The Global Soil Organic Carbon Pool / M. I. Bird, H. Santruckova, J. Lloyd and E. M. Veenendaal. - 14.1 Introduction: the Soil Carbon Pool and Global Change. - 14.2 Factors Affecting the Distribution of Soil Organic Carbon. - 14.3 Global Variations in the SOC Pool. - 14.4 The Limitations of Available Observational SOC Data. - 14.5 A Stratified Sampling Approach. - 14.6 Conclusions: Sandworld and Clayworld. - References. - 15 Plant Compounds and Their Turnover and Stability as Soil Organic Matter / G. Gleixner, C. Czimczik, C. Kramer, B. M. Lühker and M. W. I. Schmidt. - 15.1 Introduction. - 15.2 Pathways of Soil Organic Matter Formation. - 15.2.1 Formation and Decomposition of Biomass. - 15.2.2 The Influence of Environmental Conditions on SOM Formation. - 15.2.3 For
    Location: A 18 - must be ordered
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  • 2
    Electronic Resource
    Electronic Resource
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Environment and Resources 28 (2003), S. 1-28 
    ISSN: 1543-5938
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Variability of the atmospheric and oceanic circulations in the earth system gives rise to an array of naturally occurring dynamical modes. Instead of being spatially independent or spatially uniform, climate variability in different parts of the globe is orchestrated by one or a combination of several climate modes, and global changes take place with a distinctive spatial pattern resembling that of the modes-related climate anomalies. Climate impact on the dynamics of terrestrial and marine biosphere also demonstrates clear signals for the mode effects. In this review, we view modes as an important attribute of climate variability, changes, and impact and emphasize the emerging concept that future climate changes may be manifest as changes in the leading modes of the climate system. The focus of this review is on three of the leading modes: the North Atlantic Oscillation, the El Nino-Southern Oscillation, and the Pacific Decadal Oscillation.
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  • 3
    Electronic Resource
    Electronic Resource
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Environment and Resources 28 (2003), S. 521-558 
    ISSN: 1543-5938
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Agriculture and industrial development have led to inadvertent changes in the natural carbon cycle. As a consequence, concentrations of carbon dioxide and other greenhouse gases have increased in the atmosphere and may lead to changes in climate. The current challenge facing society is to develop options for future management of the carbon cycle. A variety of approaches has been suggested: direct reduction of emissions, deliberate manipulation of the natural carbon cycle to enhance sequestration, and capture and isolation of carbon from fossil fuel use. Policy development to date has laid out some of the general principles to which carbon management should adhere. These are summarized as: how much carbon is stored, by what means, and for how long. To successfully manage carbon for climate purposes requires increased understanding of carbon cycle dynamics and improvement in the scientific capabilities available for measurement as well as for policy needs. The specific needs for scientific information to underpin carbon cycle management decisions are not yet broadly known. A stronger dialogue between decision makers and scientists must be developed to foster improved application of scientific knowledge to decisions. This review focuses on the current knowledge of the carbon cycle, carbon measurement capabilities (with an emphasis on the continental scale) and the relevance of carbon cycle science to carbon sequestration goals.
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  • 4
    Electronic Resource
    Electronic Resource
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Environment and Resources 28 (2003) 
    ISSN: 1543-5938
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1365-2486
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Geography
    Notes: The alteration of climate is driven not only by anthropogenic activities, but also by biosphere processes that change in conjunction with climate. Emission of volatile organic compounds (VOCs) from vegetation may be particularly sensitive to changes in climate and may play an important role in climate forcing through their influence on the atmospheric oxidative balance, greenhouse gas concentration, and the formation of aerosols. Using the VEMAP vegetation database and associated vegetation responses to climate change, this study examined the independent and combined effects of simulated changes in temperature, CO2 concentration, and vegetation distribution on annual emissions of isoprene, monoterpenes, and other reactive VOCs (ORVOCs) from potential vegetation of the continental United States. Temperature effects were modelled according to the direct influence of temperature on enzymatic isoprene production and the vapour pressure of monoterpenes and ORVOCs. The effect of elevated CO2 concentration was modelled according to increases in foliar biomass per unit of emitting surface area. The effects of vegetation distribution reflects simulated changes in species spatial distribution and areal coverage by 21 different vegetation classes. Simulated climate warming associated with a doubled atmospheric CO2 concentration enhanced total modelled VOC emission by 81.8% (isoprene + 82.1%, monoterpenes + 81.6%, ORVOC + 81.1%), whereas a simulated doubled CO2 alone enhanced total modelled VOC emission by only + 11.8% (isoprene + 13.7%, monoterpenes + 4.1%, ORVOC + 11.7%). A simulated redistribution of vegetation in response to altered temperatures and precipitation patterns caused total modelled VOC emission to decline by 10.4% (isoprene – 11.7%, monoterpenes – 18.6%, ORVOC 0.0%) driven by a decline in area covered by vegetation classes emitting VOCs at high rates. Thus, the positive effect of leaf-level adjustments to elevated CO2 (i.e. increases in foliar biomass) is balanced by the negative effect of ecosystem-level adjustments to climate (i.e. decreases in areal coverage of species emitting VOC at high rates).
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  • 6
    ISSN: 1365-2486
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Geography
    Notes: We performed a synthetic analysis of Harvard Forest net ecosystem exchange of CO2 (NEE) time series and a simple ecosystem carbon flux model, the simplified Photosynthesis and Evapo-Transpiration model (SIPNET). SIPNET runs at a half-daily time step, and has two vegetation carbon pools, a single aggregated soil carbon pool, and a simple soil moisture sub-model. We used a stochastic Bayesian parameter estimation technique that provided posterior distributions of the model parameters, conditioned on the observed fluxes and the model equations. In this analysis, we estimated the values of all quantities that govern model behavior, including both rate constants and initial conditions for carbon pools. The purpose of this analysis was not to calibrate the model to make predictions about future fluxes but rather to understand how much information about process controls can be derived directly from the NEE observations. A wavelet decomposition enabled us to assess model performance at multiple time scales from diurnal to decadal. The model parameters are most highly constrained by eddy flux data at daily to seasonal time scales, suggesting that this approach is not useful for calculating annual integrals. However, the ability of the model to fit both the diurnal and seasonal variability patterns in the data simultaneously, using the same parameter set, indicates the effectiveness of this parameter estimation method. Our results quantify the extent to which the eddy covariance data contain information about the ecosystem process parameters represented in the model, and suggest several next steps in model development and observations for improved synthesis of models with flux observations.
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science Ltd
    Global change biology 11 (2005), S. 0 
    ISSN: 1365-2486
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Geography
    Notes: Using data from 28 flux measurement sites, we performed an analysis of the relationship between annual net ecosystem exchange (NEE) and the length of the carbon uptake period (CUP) (the number of days when the ecosystem is a net carbon sink). The observations suggest a linear correlation between the two quantities. The change in annual carbon exchange per day of the CUP differs significantly between deciduous and evergreen vegetation types. The sites containing vegetation with short-lived foliage (less than 1 year) have higher carbon uptake and respiration rates than evergreen vegetation. The ratio between mean daily carbon exchange rates during carbon uptake and release periods is relatively invariant (2.73±1.08) across different vegetation types. This implies that a balance between carbon release and uptake periods exists despite different photosynthetic pathways, life forms, and leaf habits. The mean daily carbon sequestration rate for these ecosystems never exceeds the carbon emission rate by more than a factor of 3. Growing season lengths for the study sites were derived from the normalized difference vegetation index (NDVI) of advanced very-high-resolution radiometer and from the enhanced vegetation index (EVI) of VEGETATION SPOT-4. NDVI and EVI were found to be closely related to the CUP, and consequently they also can be used to approximate annual carbon exchange of the ecosystems. This approach has potential for allowing extrapolation of NEE over large areas from remotely sensed data, given a certain amount of ancillary information. This method could complement the currently existing techniques for extrapolation, which rely upon modeling of the individual gross fluxes.
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  • 8
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Global change biology 1 (1995), S. 0 
    ISSN: 1365-2486
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Geography
    Notes: The terrestrial biosphere plays an important role in the global carbon cycle. In the 1994 Intergovernmental Panel Assessment on Climate Change (IPCC), an effort was made to improve the quantification of terrestrial exchanges and potential feedbacks from climate, changing CO2, and other factors; this paper presents the key results from that assessment, together with expanded discussion. The carbon cycle is the fluxes of carbon among four main reservoirs: fossil carbon, the atmosphere, the oceans, and the terrestrial biosphere. Emissions of fossil carbon during the 1980s averaged 5.5 Gt y−1. During the same period, the atmosphere gained 3.2 Gt C y−1 and the oceans are believed to have absorbed 2.0 Gt C y−1. The regrowing forests of the Northern Hemisphere may have absorbed 0.5 Gt C y−1 during this period. Meanwhile, tropical deforestation is thought to have released an average 1.6 Gt C y−1 over the 1980s. While the fluxes among the four pools should balance, the average 198Ds values lead to a ‘missing sink’ of 1.4 Gt C y−1 Several processes, including forest regrowth, CO2 fertilization of plant growth (c. 1.0 Gt C y−1), N deposition (c. 0.6 Gt C y−1), and their interactions, may account for the budget imbalance. However, it remains difficult to quantify the influences of these separate but interactive processes. Uncertainties in the individual numbers are large, and are themselves poorly quantified. This paper presents detail beyond the IPCC assessment on procedures used to approximate the flux uncertainties.Lack of knowledge about positive and negative feedbacks from the biosphere is a major limiting factor to credible simulations of future atmospheric CO2 concentrations. Analyses of the atmospheric gradients of CO2 and 13 CO2 concentrations provide increasingly strong evidence for terrestrial sinks, potentially distributed between Northern Hemisphere and tropical regions, but conclusive detection in direct biomass and soil measurements remains elusive.Current regional-to-global terrestrial ecosystem models with coupled carbon and nitrogen cycles represent the effects of CO2 fertilization differently, but all suggest longterm responses to CO2 that are substantially smaller than potential leaf- or laboratory whole plant-level responses. Analyses of emissions and biogeochemical fluxes consistent with eventual stabilization of atmospheric CO2 concentrations are sensitive to the way in which biospheric feedbacks are modeled by c. 15%. Decisions about land use can have effects of 100s of Gt C over the next few centuries, with similarly significant effects on the atmosphere.Critical areas for future research are continued measurements and analyses of atmospheric data (CO2 and 13CO2) to serve as large-scale constraints, process studies of the scaling from the photosynthetic response to CO2 to whole-ecosystem carbon storage, and rigorous quantification of the effects of changing land use on carbon storage.
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  • 9
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 420 (2002), S. 29-30 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In 1997–98, the growth rate of carbon dioxide in the atmosphere doubled, reaching the highest on record. As even casual television viewers could have guessed, a contribution to the increase might have come from the wildfires occurring in Indonesia at that time, which burned for months and ...
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  • 10
    Electronic Resource
    Electronic Resource
    [s.l.] : Macmillan Magazines Ltd.
    Nature 393 (1998), S. 208-209 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Following the signing of the Climate Convention in Rio in 1992, and the subsequent conference in Kyoto late last year, there is a pressing need to find out more about the relationship between anthropogenic emissions of the main greenhouse gas, CO2, and the resulting atmospheric ...
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