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Impact Des Aerosols Sur Le Cycle De Vie Du Brouillard
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Book Synopsis Impact des aérosols sur le cycle de vie du brouillard by : Jérôme Rangognio
Download or read book Impact des aérosols sur le cycle de vie du brouillard written by Jérôme Rangognio and published by . This book was released on 2009 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: Le rôle des particules atmosphériques dans la formation des gouttelettes nuageuses a fait l'objet de nombreux travaux, du point de vue expérimental comme numérique. Ce travail s'intéresse au brouillard radiatif. La particularité de ce type de nuage est qu'il se forme dans les basses couches de l'atmosphère, directement en contact avec la surface, là où les concentrations en particules d'aérosols sont les plus élevées. Pour comprendre l'impact de ces particules d'aérosols sur le cycle de vie du brouillard, deux campagnes de mesures ParisFOG et ToulouseFOG ont été réalisées. Après un état de l'art général sur les caractéristiques des aérosols atmosphériques, plusieurs cas de brouillards radiatifs sont présentés, en insistant plus particulièrement sur les propriétés des aérosols et des gouttelettes nuageuses mesurées au cours de ces deux campagnes de mesures. Il apparaît en général très difficile de mettre en avant des interprétations physiques basées uniquement sur les observations. Pour répondre à cette problématique, des simulations numériques 1-D ont été réalisées en utilisant le modèle météorologique Méso-NH, incluant le module d'aérosol ORILAM couplé à un schéma microphysique nuageux à deux-moments. Le schéma d'activation des aérosols est basé sur les travaux d'Abdul-Razzak (2004() Ce schéma permet de prendre en compte la nature chimique et la granulométrie des particules d'aérosols observées. Dans cette approche, la nécessité d'une démarche conjointe entre l'observation et la modélisation numérique est clairement apparue. Des études "off-line" de sensibilité de l'activation des CCN (Cloud Condensation Nuclei) à la concentration en nombre, la taille et la composition chimique des aérosols ont été réalisées en utilisant seulement le schéma d'activation d'Abdul-Razzak (2004). Les interactions avec les autres processus physiques n'ont pas été pris en compte pour ces études "off-line". Différents régimes de l'activation des CCN et une valeur critique de la concentration en nombre d'aérosols ont été mis en évidence. Ce nombre critique d'aérosols correspond au maximum de gouttelettes formées pour un taux de refroidissement et une composition chimique de l'aérosol donnés...
Book Synopsis Impact de l'aérosol sur le cycle de vie des nuages de couche limite by : Irina Sandu
Download or read book Impact de l'aérosol sur le cycle de vie des nuages de couche limite written by Irina Sandu and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: L'aérosol anthropique peut affecter le cycle de vie des nuages de couche limite, en modifiant l'albédo du nuage et en inhibant la formation des précipitations. Cependant, il est difficile de quantifier ces impacts à partir d'observations. Les interactions aérosol-nuages de couche limite sont donc étudiées à l'aide des modèles numériques à résolution fine (LES), qui disposent de paramétrisations détaillées de la turbulence, du transfert radiatif et de la microphysique nuageuse. Dans cette étude, nous examinons plus spécifiquement les impacts de l'aérosol sur le cycle diurne de stratocumulus marins. Des simulations LES d'un cycle de 36 heures sont réalisées pour des concentrations d'aérosol typiques de masses d'air pures et polluées. Partant d'un même état initial, les simulations divergent rapidement. L'augmentation de la concentration des noyaux de condensation nuageux conduit à une augmentation de la concentration des gouttelettes, à une diminution de leur diamètre, et ainsi à l'inhibition de leur sédimentation et de la précipitation de bruine. Le contenu en eau liquide au sommet nuage augmente et l'entraînement sommital est renforcé. De plus, l'absorption du rayonnement solaire à la base du nuage n'est plus compensée par l'évaporation de la bruine et le découplage de la couche nuageuse est renforcé. Dans l'ensemble, la couche limite polluée est mieux couplée la nuit et plus découplée le jour que la couche limite marine pure. Ces simulations permettent d'identifier des signatures mesurables de l'impact des aérosols sur la dynamique de la couche limite, et ainsi de mieux concevoir les expériences de terrain qui visent à quantifier ces impacts.
Book Synopsis Aerosol Pollution Impact on Precipitation by : Zev Levin
Download or read book Aerosol Pollution Impact on Precipitation written by Zev Levin and published by Springer Science & Business Media. This book was released on 2008-09-30 with total page 399 pages. Available in PDF, EPUB and Kindle. Book excerpt: Life on Earth is critically dependent upon the continuous cycling of water between oceans, continents and the atmosphere. Precipitation (including rain, snow, and hail) is the primary mechanism for transporting water from the atmosphere back to the Earth’s surface. It is also the key physical process that links aspects of climate, weather, and the global hydrological cycle. Changes in precipitation regimes and the frequency of extreme weather events, such as floods, droughts, severe ice/snow storms, monsoon fluctuations and hurricanes are of great potential importance to life on the planet. One of the factors that could contribute to precipitation modification is aerosol pollution from various sources such as urban air pollution and biomass burning. Natural and anthropogenic changes in atmospheric aerosols might have important implications for precipitation by influencing the hydrological cycle, which in turn could feed back to climate changes. From an Earth Science perspective, a key question is how changes expected in climate will translate into changes in the hydrological cycle, and what trends may be expected in the future. We require a much better understanding and hence predictive capability of the moisture and energy storages and exchanges among the Earth’s atmosphere, oceans, continents and biological systems. This book is a review of our knowledge of the relationship between aerosols and precipitation reaching the Earth's surface and it includes a list of recommendations that could help to advance our knowledge in this area.
Book Synopsis Aérosols atmosphériques by : Olivier Boucher
Download or read book Aérosols atmosphériques written by Olivier Boucher and published by Springer. This book was released on 2012-10-14 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cet ouvrage couvre de manière exhaustive le rôle des aérosols dans le changement climatique. Il aborde des sujets particulièrement actuels de la recherche scientifique - désulfurisation, carbone-suie, géo-ingénierie, en soulignant le lien avec des problématiques connexes : politique de qualité de l’air et de développement durable, développement de l’instrumentation pour la qualité de l’air et le changement climatique, problèmes économiques, etc.
Book Synopsis Dictionary of Building and Civil Engineering by : Don Montague
Download or read book Dictionary of Building and Civil Engineering written by Don Montague and published by Taylor & Francis. This book was released on 1996 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dual-language dictionary lists over 20,000 specialist terms in both French and English, covering architecture, building, engineering and property terms. It meets the needs of all building professionals working on projects overseas. It has been comprehensively researched and compiled to provide an invaluable reference source in an increasingly European marketplace.
Book Synopsis Pandemic Media by : Philipp Dominik Keidl
Download or read book Pandemic Media written by Philipp Dominik Keidl and published by Meson Press Eg. This book was released on 2021-01-23 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: With its unprecedented scale and consequences the COVID-19 pandemic has generated a variety of new configurations of media. Responding to demands for information, synchronization, regulation, and containment, these "pandemic media" reorder social interactions, spaces, and temporalities, thus contributing to a reconfiguration of media technologies and the cultures and polities with which they are entangled. Highlighting media's adaptability, malleability, and scalability under the conditions of a pandemic, the contributions to this volume track and analyze how media emerge, operate, and change in response to the global crisis and provide elements toward an understanding of the post-pandemic world to come.
Download or read book El Niño written by Bruno Voituriez and published by UNESCO. This book was released on 2000 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: El Nino, caprice of the heavens, scapegoat for every calamity? The general public cannot really understand what is behind the El Nino phenomenon. The book offers a tour of the Earth's climate to understand one of its normal but extreme components.
Book Synopsis Basic Technics in Ecological Farming / Techniques de Base en Agriculture Biologique / Grundsätzliche Verfahren der ökologischen Landwirtschaft / Le Maintien de la Fertilité des Sols / The Maintenance of Soil Fertility / Die Erhaltung der Bodenfruchtbarkeit by : Stuart Hill
Download or read book Basic Technics in Ecological Farming / Techniques de Base en Agriculture Biologique / Grundsätzliche Verfahren der ökologischen Landwirtschaft / Le Maintien de la Fertilité des Sols / The Maintenance of Soil Fertility / Die Erhaltung der Bodenfruchtbarkeit written by Stuart Hill and published by Birkhäuser. This book was released on 2013-12-14 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Weather of the 1780s Over Europe by : John Kington
Download or read book The Weather of the 1780s Over Europe written by John Kington and published by Cambridge University Press. This book was released on 1988-03-31 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: John Kington's book gives a definitive account of the weather in the 1780s over Europe.
Book Synopsis A Frequency Dictionary of French by : Deryle Lonsdale
Download or read book A Frequency Dictionary of French written by Deryle Lonsdale and published by Routledge. This book was released on 2009-03-25 with total page 974 pages. Available in PDF, EPUB and Kindle. Book excerpt: A Frequency Dictionary of French is an invaluable tool for all learners of French, providing a list of the 5000 most frequently used words in the language. Based on a 23-million-word corpus of French which includes written and spoken material both from France and overseas, this dictionary provides the user with detailed information for each of the 5000 entries, including English equivalents, a sample sentence, its English translation, usage statistics, and an indication of register variation. Users can access the top 5000 words either through the main frequency listing or through an alphabetical index. Throughout the frequency listing there are thematically-organized lists of the top words from a variety of key topics such as sports, weather, clothing, and family terms. An engaging and highly useful resource, the Frequency Dictionary of French will enable students of all levels to get the most out of their study of French vocabulary. Former CD content is now available to access at www.routledge.com/9780415775311 as support material. Designed for use by corpus and computational linguists it provides the full text in a format that researchers can process and turn into suitable lists for their own research work. Deryle Lonsdale is Associate Professor in the Linguistics and English Language Department at Brigham Young University (Provo, Utah). Yvon Le Bras is Associate Professor of French and Department Chair of the French and Italian Department at Brigham Young University (Provo, Utah).
Author :Hans-Ferdinand Linskens Publisher :Springer Science & Business Media ISBN 13 :3642833403 Total Pages :396 pages Book Rating :4.6/5 (428 download)
Book Synopsis Wine Analysis by : Hans-Ferdinand Linskens
Download or read book Wine Analysis written by Hans-Ferdinand Linskens and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modern Methods of Plant Analysis When the handbook Modern Methods of Plant Analysis was first introduced in 1954 the considerations were: 1. the dependence of scientific progress in biology on the improvement of existing and the introduction of new methods; 2. the difficulty in finding many new analytical methods in specialized journals which are normally not accessible to experimental plant biologists; 3. the fact that in the methods sections of papers the description of methods is frequently so compact, or even sometimes so incomplete that it is difficult to reproduce experiments. These considerations still stand today. The series was highly successful, seven volumes appearing between 1956 and 1964. Since there is still today a demand for the old series, the publisher has decided to resume publication of Modern Methods of Plant Analysis. It is hoped that the New Series will be just as acceptable to those working in plant sciences and related fields as the early volumes undoubtedly were. It is difficult to single out the major reasons for success of any publication, but we believe that the methods published in the first series were up-to-date at the time and presented in a way that made description, as applied to plant material, complete in itself with little need to consult other publications. Contributing authors have attempted to follow these guidelines in this New Series of volumes.
Book Synopsis Clinical Management of Patients with Viral Haemorrhagic Fever by : World Health Organization
Download or read book Clinical Management of Patients with Viral Haemorrhagic Fever written by World Health Organization and published by World Health Organization. This book was released on 2016-05-03 with total page 203 pages. Available in PDF, EPUB and Kindle. Book excerpt: First published in March 2014 under the title "Clinical management of patients with viral haemorrhagic fever: a pocket guide for front-line health workers: interim emergency guidance for West Africa".
Book Synopsis The Magician's Dictionary by : Edward Rehmus
Download or read book The Magician's Dictionary written by Edward Rehmus and published by Feral House. This book was released on 2012-03-14 with total page 307 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unlike most occult teaches, E.E. Rehmus doesn't mince words. He defines them. His Magician's Dictionary picks up where all other occult reference works leave off -- at the dawn of the apocalypse.
Book Synopsis Nuclear Power Growth, 1974-2000 by : U.S. Atomic Energy Commission. Office of Planning and Analysis
Download or read book Nuclear Power Growth, 1974-2000 written by U.S. Atomic Energy Commission. Office of Planning and Analysis and published by . This book was released on 1974 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book EPA-660/2 written by and published by . This book was released on 1973-12 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Swarms of Ions and Electrons in Gases by : W. Lindinger
Download or read book Swarms of Ions and Electrons in Gases written by W. Lindinger and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 319 pages. Available in PDF, EPUB and Kindle. Book excerpt: Our understanding of elementary processes in plasmas has been increasing dramatically over the last few years. The development of various swarm techniques, such as the temperature variable selected ion flow tube or the selected ion flow drift tube, has provided the prerequisite for detailed investigations into ion molecule reactions both in binary and three body collisions, and the mechanisms of many reactions are now understood quite satisfactorily. This information could not have been obtained without a detailed knowledge of the transport phenomena involved. Some of these, such as the internal-energy distribution of drifting ions, have only very recently been tackled both theoretically and experimentally; a consistent model is now being developed. As the interactions between the various branches of swarm research have become more and more intense, the most obvious thing to do was putting together a review on the present state of this subject, which is the aim of this book.
Download or read book China Goes Green written by Yifei Li and published by John Wiley & Sons. This book was released on 2020-09-01 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt: What does it mean for the future of the planet when one of the world’s most durable authoritarian governance systems pursues “ecological civilization”? Despite its staggering pollution and colossal appetite for resources, China exemplifies a model of state-led environmentalism which concentrates decisive political, economic, and epistemic power under centralized leadership. On the face of it, China seems to embody hope for a radical new approach to environmental governance. In this thought-provoking book, Yifei Li and Judith Shapiro probe the concrete mechanisms of China’s coercive environmentalism to show how ‘going green’ helps the state to further other agendas such as citizen surveillance and geopolitical influence. Through top-down initiatives, regulations, and campaigns to mitigate pollution and environmental degradation, the Chinese authorities also promote control over the behavior of individuals and enterprises, pacification of borderlands, and expansion of Chinese power and influence along the Belt and Road and even into the global commons. Given the limited time that remains to mitigate climate change and protect millions of species from extinction, we need to consider whether a green authoritarianism can show us the way. This book explores both its promises and risks.
