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When considering biosphere–atmosphere exchange of trace gases and volatile aerosols, significant advances have been made both from an experimental and modelling point of view and on several scales. This was particularly stimulated by the availability of new datasets generated from improvements in analytical methods and flux measurement techniques. Recent research advances allow us, not only to identify major mechanisms and factors affecting the exchanges between the biosphere and the atmosphere, but also to recognize several gaps in the methodologies used in accounting for emissions and deposition in landscape and global scale models. This work aims at (i) reviewing exchange processes and modelling schemes, parameterisations and datasets, (ii) presenting a common conceptual framework to model soil-vegetation-atmosphere exchange of reactive trace gases and aerosols accounting for in-canopy transfer chemical interactions and (iii) discussing the key elements of the agreed framework.
This book gives an overview of the relationships between agriculture and air quality, which is an issue of increasing importance for practitioners and policy makers. It provides the keys to understand natural and anthropogenic mechanisms governing emission and deposition of pollutants produced by and/or impacting agricultural activities It identifies how management practices can help mitigating emissions and how public policies on air pollution progressively addressed the agricultural sector This book was written for students, researchers and agriculture actors as well as for public decision-makers
Anthropogenic emissions of ammonia cause a host of environmental impacts, including loss of biodiversity, soil acidification and formation of particulate matter in the atmosphere. Under the auspices of the UNECE Convention on Long Range Transboundary Air Pollution, around 80 international experts met to review the state of scientific knowledge. This book reports their analysis. It concludes that threshold levels for ammonia effects have been underestimated and sets new values, it assesses the independent evidence to verify reported reductions in regional ammonia emissions, and it reviews the uncertainties in modelling ammonia, both in "hot spots" and at the regional scale.
Presenting the first continental-scale assessment of reactive nitrogen in the environment, this book sets the related environmental problems in context by providing a multidisciplinary introduction to the nitrogen cycle processes. Issues of upscaling from farm plot and city to national and continental scales are addressed in detail with emphasis on opportunities for better management at local to global levels. The five key societal threats posed by reactive nitrogen are assessed, providing a framework for joined-up management of the nitrogen cycle in Europe, including the first cost-benefit analysis for different reactive nitrogen forms and future scenarios. Incorporating comprehensive maps, a handy technical synopsis and a summary for policy makers, this landmark volume is an essential reference for academic researchers across a wide range of disciplines, as well as stakeholders and policy makers. It is also a valuable tool in communicating the key environmental issues and future challenges to the wider public.
Chaco Canyon, the great Ancestral Pueblo site of the eleventh and twelfth centuries, has inspired excavations and research for more than one hundred years. Chaco Revisited brings together an A-team of Chaco scholars to provide an updated, refreshing analysis of over a century of scholarship. In each of the twelve chapters, luminaries from the field of archaeology and anthropology, such as R. Gwinn Vivian, Peter Whiteley, and Paul E. Minnis, address some of the most fundamental questions surrounding Chaco, from agriculture and craft production, to social organization and skeletal analyses. Though varied in their key questions about Chaco, each author uses previous research or new studies to ultimately blaze a trail for future research and discoveries about the canyon. Written by both up-and-coming and well-seasoned scholars of Chaco Canyon, Chaco Revisited provides readers with a perspective that is both varied and balanced. Though a singular theory for the Chaco Canyon phenomenon is yet to be reached, Chaco Revisited brings a new understanding to scholars: that Chaco was perhaps even more productive and socially complex than previous analyses would suggest.