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60 produkter
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On decadal time scales, climate change may result not only from man-made causes, but also from natural processes. This book brings together theoretical conceptions of the physical mechanisms of climate change with observational evidence of these changes. The following key topics are included: Observed Climatic Variability, Predictability of the Atmosphere and Oceans from Days to Decades, and Mechanisms for Decadal to Centennial Climate Variability. Further, there are specialised contributions on the role of the oceanic circulation in climate change. The authors are renowned for their pedagogical skills, and the book is primarily designed for beginners in the field, who have a background in physical science. In addition, it is an invaluable source of information for scientists seeking an overview on climate dynamics.
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The search for an accurate knowledge of the transfer of energy and water in our climate system and of all participating processes is still a burning issue within environmental and climate research. More reliable ways should be found to model them in their complex interplay with cascades of processes in that system, and their impact on all our resources on earth. Such modelling needs also validation with accurate and complete observations which in turn should also enable to observe variations of climate components. These are the goals of the Global Energy and Water Experiment (GEWEX), which began its work about 8 years ago. Many advanced remote sensing capabilities have now been developed, of which only a few will enter into satellite based platforms. These new developments should be brought to the attention of a broader community of younger scientists, in particular of those countries which quite recently could open their borders for free exchanges.
3 163 kr
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Biomass burning profoundly affects atmospheric chemistry, the carbon cycle, and climate and may have done so for millions of years. Bringing together renowned experts from paleoecology, fire ecology, atmospheric chemistry, and organic chemistry, the volume elucidates the role of fire during global changes of the past and future. Topics covered include: the characterization of combustion products that occur in sediments, including char, soot/fly ash, and polycyclic aromatic hydrocarbons; the calibration of these constituents against atmospheric measurements from wildland and prescribed fire emissions; spatial and temporal patterns in combustion emissions at scales of individual burns to the globe.
Del 52 - Nato ASI Subseries I:
Solar Ultraviolet Radiation
Modelling, Measurements and Effects
Inbunden, Engelska, 1997
2 111 kr
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This volume brings together state-of-the-art views on ultraviolet radiation, its modelling, and effects from an interdisciplinary panel of international experts. The growing field of research is presented in a sequence from the arrival of UV light at the top of the atmosphere through its transfer to various biological receptors. Modelling and current issues on UV radiative transfer in clear and turbid environments are discussed. Further, measurements and calibration methods are reviewed and, for the first time, established calibration protocols are presented in a coherent way.
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This book provides a comprehensive introduction to the stratosphere and its role in our understanding of the climate system. The key dynamic, radiative, and chemical processes that determine the distribution of chemical compounds including ozone in the stratosphere are discussed. The chapters contributed by outstanding experts focus not only on fundamental aspects related to these issues, but also present a number of applications including instrumentation, laboratory studies, and atmospheric observations.
3 163 kr
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On decadal time scales, climate change may result not only from man-made causes, but also from natural processes. This book brings together theoretical conceptions of the physical mechanisms of climate change with observational evidence of these changes. The following key topics are included: Observed Climatic Variability, Predictability of the Atmosphere and Oceans from Days to Decades, and Mechanisms for Decadal to Centennial Climate Variability. Further, there are specialised contributions on the role of the oceanic circulation in climate change. The authors are renowned for their pedagogical skills, and the book is primarily designed for beginners in the field, who have a background in physical science. In addition, it is an invaluable source of information for scientists seeking an overview on climate dynamics.
1 585 kr
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The search for an accurate knowledge of the transfer of energy and water in our climate system and of all participating processes is still a burning issue within environmental and climate research. More reliable ways should be found to model them in their complex interplay with cascades of processes in that system, and their impact on all our resources on earth. Such modelling needs also validation with accurate and complete observations which in turn should also enable to observe variations of climate components. These are the goals of the Global Energy and Water Experiment (GEWEX), which began its work about 8 years ago. Many advanced remote sensing capabilities have now been developed, of which only a few will enter into satellite based platforms. These new developments should be brought to the attention of a broader community of younger scientists, in particular of those countries which quite recently could open their borders for free exchanges.
2 111 kr
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This volume brings together state-of-the-art views on ultraviolet radiation, its modelling, and effects from an interdisciplinary panel of international experts. The growing field of research is presented in a sequence from the arrival of UV light at the top of the atmosphere through its transfer to various biological receptors. Modelling and current issues on UV radiative transfer in clear and turbid environments are discussed. Further, measurements and calibration methods are reviewed and, for the first time, established calibration protocols are presented in a coherent way.
2 111 kr
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This book provides a comprehensive introduction to the stratosphere and its role in our understanding of the climate system. The key dynamic, radiative, and chemical processes that determine the distribution of chemical compounds including ozone in the stratosphere are discussed. The chapters contributed by outstanding experts focus not only on fundamental aspects related to these issues, but also present a number of applications including instrumentation, laboratory studies, and atmospheric observations.
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The analysis of polar ice cores has proven to be very instructive about past environmental conditions on the time scale of several climatic cycles, and recent drilling operations have provided information of great value for global change issues.The book presents the most recent data extracted from Greenland ice cores and surface experiments and compares them with former Antarctic results. It contains background articles, original contributions and group reports of interest to scientists, climatologists, atmospheric chemists, and glaciologists involved in global change research.
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TO THE MODEL EVALUATION 1. MODELLING SOIL EROSION BY WATER l 2 John Boardman and David Favis-Mortlock 1 School of Geography and Environmental Change Unit Mansfield Road University of Oxford Oxford OX1 3TB UK 2 Environmental Change Unit University of Oxford 5 South Parks Road Oxford OX1 3UB UK Introduction This volume is the Proceedings of the NATO Advanced Research Workshop 'Global Change: Modelling Soil Erosion by Water', which was held on II-14th September 1995, at the University of Oxford, UK. The meeting was also one of a series organised by the IGBP 1 GCTE Soil Erosion Network, which is a component of GCTE's Land Degradation Task (3.3.2) (Ingram et aI., 1996; Valentin, this volume). One aim of the GCTE Soil Erosion Network is to evaluate the suitability of existing soil erosion models for predicting the possible impacts of global change upon soil erosion. Due to the wide range of erosion models currently, in use or under development, it was decided to evaluate models in the following sequence Favis-Mortlock et al., 1996): • field-scale water erosion models • catchmenr-scale water erosion models • wind erosion models • models with a landscape-scale and larger focus. As part of this strategy, the first stage of the GCTE validation of field-scale erosion models was carried out at the Oxford NATO-ARW. I A list of Acronyms fonns Appendix A.
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Biomass burning profoundly affects atmospheric chemistry, the carbon cycle, and climate and may have done so for millions of years. Bringing together renowned experts from paleoecology, fire ecology, atmospheric chemistry, and organic chemistry, the volume elucidates the role of fire during global changes of the past and future. Topics covered include: the characterization of combustion products that occur in sediments, including char, soot/fly ash, and polycyclic aromatic hydrocarbons; the calibration of these constituents against atmospheric measurements from wildland and prescribed fire emissions; spatial and temporal patterns in combustion emissions at scales of individual burns to the globe.
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The Advanced Study Institute Ice Physics in the Natural and Endangered Environ ment was held at Acquafredda di Maratea, Italy, from September 7 to 19, 1997. The ASI was designed to study the broad range of ice science and technology, and it brought together an appropriately interdisciplinary group of lecturers and students to study the many facets of the subject. The talks and poster presentations explored how basic molecular physics of ice have important environmental consequences, and, con versely, how natural phenomena present new questions for fundamental study. The of lectures discusses these linkages, in order that overall unity of following sunimary the subject and this volume can be perceived. Not all of the lecturers and participants were able to contribute a written piece, but their active involvement was crucial to the success of the Institute and thereby influenced the content of the volume. We began the Institute by retracing the history of the search for a microscopic un derstanding of melting. Our motivation was straightforward. Nearly every phenome non involving ice in the environment is influenced by the change of phase from solid to liquid or vice-versa. Hence, a sufficiently deep physical picture of the melting tran sition enriches our appreciation of a vast array of geophysical and technical problems.
Land Surface Processes in Hydrology
Trials and Tribulations of Modeling and Measuring
Häftad, Engelska, 2011
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General circulation models (GCMs) predict certain changes in the amounts and distribution of precipitation, but the conversion of these predictions of impacts on water resources presents novel problems in hydrologic modeling, particularly with regard to the scale of the processes involved. Therefore improved, distributed GCMs are required. New remote sensing technologies provide the necessary spatially distributed data. However, there are many attendant problems with the translation of remotely sensed signals into hydrologically relevant information. This book elucidates how to improve the representation of land surface hydrologic processes in GCMs and in regional and global scale climate studies. It is divided into five sections: Models and Data; Precipitation; Soil Moisture; Evapotranspiration; Runoff.
Past and Future Rapid Environmental Changes
The Spatial and Evolutionary Responses of Terrestrial Biota
Häftad, Engelska, 2011
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Numerous experts including ecologists, geneticists, paleontologists and climatologists, investigate the response of terrestrial organisms to changes in their environment. The volume comprises an introductory and a final chapter by the editors as well as another 35 contributions. These are divided into six sections: 1. past environmental changes - the late-Quaternary; 2. spatial responses to past changes; 3. mechanisms enabling spatial responses; 4. evolutionary responses to past changes; 5. mechanisms enabling evolutionary responses; 6. predicted future environmental changes and simulated responses. The overwhelming and unanimous conclusion of all contributors is that forecasted global environmental changes pose a severe threat to the integrity of ecosystems worldwide and to the survival of at least some species.
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The book is divided into fourth parts containing a total of 16 chapters: Parts I, II and III are devoted to general models and Part IV to models related to some local problems.
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Around 4000 years ago the advanced urban civilizations in Egypt, Mesopotamia and India suddenly collapsed. What happened? Did a prolonged drought cause the breakdown of social order? Recent discoveries from all over the world strongly support the suspected link of the collapse with climate. The volume presents the findings of more than 40 researchers and provides a review on the relevant information. It appears that a major shift of the precipitation pattern affected many parts of the world at approximately the same time, with disastrous effects on the nomadic populations of Asia, Africa and Eastern Europe. Can a similar climate shift with a serious adverse impact on society happen again? In a world facing global warming, there could be many lessons to be learned from the experiences of ancient societies.
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The subject of this volume is the observation and modelling of the gravity wave field in the atmosphere. The focus is on the question of how to include the effects of small-scale gravity waves in sophisticated global climate models. The book comprises 26 chapters, including contributions from distinguished experts in observation and theory, along with results from studies of gravity wave parameterization within comprehensive climate models.
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An increasing allllo~/allce because of the anthropogenically induced ozone depletion and relevant illcrca5e of the surface ultraviolet (UV) radiation (including erythemal part of the UV spectrum) has resulted in the growth of interest to total ozone (TOZ) surface and satellite observations, surface UV measurements (with an emphasis on UV -B) and. the interpretation of observation results to assess potential impacts of the UV radiation enhancement on man and biosphere. The significance of this phenomenon is diJIcrent in various cowltries. Special attention has been paid, for instance, to ozone depletion and UV radiation increase at high latitudes (this problem has also been discussed during the Workshop). It is equally clear, however, that low and mid-latitude environmental dynamics requires carefuU monitoring and assessment of environm(:ntal trends as well. Such a conclusion is especially true for the Mediterranean Region where numerous resort places are located and subject to excessive levels of Solar Ultraviolet Radiation. This is why the NATO Advanced Rcsearch Workshop "Ground-Level and Satellite Ozone Observations: Changes in the Mediterranean Region" was organized and took place in Athens (Grcccc) during the Lime period 31 October -4 November 1995. It should be pointed out, however, that presentations discussed during the Workshop went far beyond the regional scale of consideration. This has been very important, because it opened an opportwlity to analyse the Mediterrane:an environmental situation in the broader contcx1 of the European global changes.
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The objective of this NATO Advanced Research Workshop was to discuss our current understanding of the role of clouds in climate and chemistry. The range of topics dis cussed during the workshop included: modeling of clouds in GCMs; observations of the cloud micro physical properties; the water vapor cycle; troposphere-stratosphere exchange; role of in-cloud transport in tropospheric ozone; regulation of current and paleo climate by clouds; and anthropogenic sulfate aerosols and modification of cloud properties. The essence of the discussions is captured in the accompanying summary by the rapporteurs and the chapters by some of the speakers. The underlying message is that significant progress has been made, resulting in exciting new developments in our perception of the role of clouds in the global system . .. The tropical convective-cirrus cloud systems emerge as a major influence on the climate system. Micro physical processes, such as the rate of precipitation and re evaporation of ice particles, seem to regulate the large scale vertical distribution of water vapor which is the dominant greenhouse gas. Water vapor data collected during the Central Equatorial Pacific Experiment (CEPEX), document the large moistening effect of deep convection on scales of thousands of kilometers. A major chemical finding in the same region was the observation of extremely low ozone 8 volume mixing ratios of less than 10- in the entire troposphere of the central equatorial Pacific extending over a distance of about 2000 km. This finding establishes the Pacific as a major chemical sink region for tropospheric ozone.
Climate Sensitivity to Radiative Perturbations
Physical Mechanisms and Their Validation
Häftad, Engelska, 2011
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Current climate models diverge in their assessment of global warming that will result from the anthropogenic increase in trace gases. This is because they differ in their representation of the hydrological cycle (water vapour, clouds, snow and sea ice, soil moisture) and because a direct validation in terms of sensitivity is not possible. Indirect methods and approaches are therefore necessary to verify the models efficiently. The book provides an overview on different validation approaches. The use of satellite data is particularly stressed.
Diachronic Climatic Impacts on Water Resources
with Emphasis on the Mediterranean Region
Häftad, Engelska, 2014
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Since the beginning of man's existence on Earth, the adequacy of available water has been as important as any other factor for man's survival and prosperity. The volume comprises comprehensive reviews on: Paleoenvironments of arid land, climate-water-man interactions, water resources in the Minoan era, ancient Greek examples of avoiding water shortages, climatic changes in the eastern Mediterranean region since 5000 B.C., climatic evolution in ancient civilizations based on fossil studies, impact of climatic changes on groundwater and Mediterranean wetlands. The book is written for civil and agricultural engineers, hydrologists, geologists, environmental scientists and researchers. It is also useful as a reference to consulting engineers, agriculturists, environmentalists and students.
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In the last half decade since sustainable development became a serious objective, what have we achieved? Are livelihoods more secure? Are nations wealthier and more resilient? Is environmental quality being restored or maintained? These are essential questions of development. Their answers are many, varied between communities and regions, even between individuals. Two years ago, in the aftermath of the Earth Summit and ratification of the Framework Convention on Climate Change, but before the first Conference of Parties, I participated in a panel at the inaugural Oxford Environment Conference on Climate Change and World Food Security. The panel vigorously reviewed issues of resilient development and food security. This book is a product of the Oxford Environment Conference. It takes the essential questions of sustainability as a starting point to focus on present food security and its future prospects in the face of climate change. Why is this book important? First, I believe our goals to end hunger are under threat. We know what to do in many respects, but fail to generate the finances and political will to change the structures that thrive on poverty. Second, I believe concern about the environment has become dangerously separated from the fundamental issues of human deprivation. Third, I believe climate change is a serious threat and I am dismayed at the way nations dither over how to control greenhouse gas emissions and mechanisms to meet the challenge of adverse climate impacts.
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Soil organic matter (SOM) represents a major pool of carbon within the biosphere, roughly twice than in atmospheric CO2. SOM models embody our best understanding of soil carbon dynamics and are needed to predict how global environmental change will influence soil carbon stocks. These models are also required for evaluating the likely effectiveness of different mitigation options. The first important step towards systematically evaluating the suitability of SOM models for these purposes is to test their simulations against real data. Since changes in SOM occur slowly, long-term datasets are required. This volume brings together leading SOM model developers and experimentalists to test SOM models using long-term datasets from diverse ecosystems, land uses and climatic zones within the temperate region.
Microbiology of Atmospheric Trace Gases
Sources, Sinks and Global Change Processes
Häftad, Engelska, 2011
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The chapters making up this volume are based on the presentations given by their authors at the NATO Advanced Research Workshop (ARW) , also entitled "The Microbiology of Atmospheric Trace Gases: Sources, Sinks and Global Change Processes", held between 13-18 May 1995 at II Ciocco, Castelvecchio Pascoli, Tuscany, Italy. Four reports of Working Group discussions on aspects of trace gas microbiology and climate change are also included in the volume, prepared by rapporteurs designated at the ARW. All the papers here presented have been subjected to peer review by at least two referees and corrections and amendments made where necessary before their acceptance for pUblication in this volume. The ARW was set up to address a wide range of issues relating to atmospheric trace gas microbiology and the organizing group was aware of the burgeoning of studies on gas metabolism and on global effects of atmospheric trace gases over the past two decades. This research effort has led to a number of specialist and generalist meetings including the triennial series of symposia on the metabolism of one-carbon compounds, colloquia concerned with dimethyl sulfide and its precursor, DMSP, through to the Intergovernmental Panels on Climate Change, which have addressed the impact of increasing levels of atmospheric carbon dioxide, methane, nitrous oxide and chlorofluorocarbons on global climate. Over recent years methane and nitrous oxide showed rates of increase in the atmosphere of 40-48 and 3-4. 5 Tg/year, respectively.
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Globally, forest vegetation and soils are both major stores of terrestrial organic carbon, and major contributors to the annual cycling of carbon between the atmosphere and the biosphere. Forests are also a renewable resource, vital to the everyday existence of millions of people, since they provide food, shelter, fuel, raw materials and many other benefits. The combined effects of an expanding global population and increasing consumption of resources, however, may be seriously endangering both the extent and future sustainability of the world's forests. About thirty chapters cover four main themes: the role of forests in the global carbon cycle; effects of past, present and future changes in forest land use; the role of forest management, products and biomass on carbon cycling, and socio-economic impacts.
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A profound knowledge of the past climate is vital for our understanding of global warming. The past 2000 years are both the period which is of most relevance to the next century and that for which there is the most evidence. High-resolution proxy records for this period are available from a variety of sources. Five sections consider dendroclimatology, ice cores, corals, historical records, lake varves, and other indicators. The final two sections cover the histories of various forcing factors and attempt to bring together records from a variety of sources and provide explanations.
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Polar ice cores have provided tremendous advances in our knowledge of past climate change. They also contain an archive of geochemical data, which can certainly delineate some of the forcing factors that govern climate change. However, our ability to interpret these data is severely curtailed by lack of knowledge of the processes governing the transfer of chemical species from the air to the snow. This book outlines the potential and problems of ice core chemistry and discusses the processes involved in air-snow transfer. It gives the state of current knowledge and an agenda for future research.
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The NATO Advanced Research Workshop on "The Effects of the Mt. Pinatubo Erup tion on the Atmosphere and Climate" was held in Rome, September 26-30, 1994. In addition to NATO, the workshop was supported by Accademia Nazionale dei Lincei. The Organizing Committee was fortunate to enlist the participation of many of the experts in the field, and this book is an account of their contributions. The eruption of Mt. Pinatubo in June 1991 was readily recognized as one of the major eruptions of the century. In a sense it was the global experiment the atmospheric scientific community was waiting for to assess theories developed on ozone depletion and greenhouse warming. In September of that same year the launching of the UARS satellite added a new tool for observers all around the world. Three years later was a good time to convene a NATO Workshop to sum up what had been measured and theorized about the effects of the eruption. This book is divided in four chapters which cover respectively: the characterization of the aerosol cloud, the measured or simulated effects on temperature, on ozone and on climate.
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Time is a major factor in Quaternary science. Without a trustworthy chronometer any interpretation of changes in proxy data of stratigraphical origin is on weak ground. In fact, any attempt at a sound reconstruction of timing and rates of past climatic change as well as the response of the biosphere can only be achieved on the basis of a reliable chronology. Moreover, all correlations and comparisons through time on a continental or global scale depend heavily on the reliability of the time-scale used. Therefore the establishment of an absolute time-scale is a fundamental goal. In this contribution we refer to the term "absolute time-scale" as a time-scale consisting of ages determined on the basis of sidereal years. Traditional stratigraphical methods of absolute dating include the Swedish glacial varve chronology, already developed early in this century by De Geer (1912) and since then continuously improved (e.g. Stromberg 1985; Cato 1987). Unfortunately, however, a spatial correlation with other stratigraphies outside Fennoscandia is difficult.