Impact radiatif des aérosols de haute altitude

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ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (11 download)

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Book Synopsis Impact radiatif des aérosols de haute altitude by : Aurélien Chauvigné

Download or read book Impact radiatif des aérosols de haute altitude written by Aurélien Chauvigné and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: La présence des particules d'aérosols dans l'atmosphère influencent le bilan radiatif de notre planète et ainsi son équilibre climatique. Selon les différents mécanismes d'émission et processus de transports atmosphériques, les aérosols peuvent être entrainés dans la troposphère libre et ainsi y résider pendant plusieurs semaines. Les contributions optiques et radiatives des aérosols de troposphère libre par rapport à celles de la colonne atmosphérique sont encore mal évaluées du fait de la difficulté d'accès et du manque de mesures sur de longues périodes. Ces travaux de thèse se sont donc appuyés sur deux sites d'altitude présentant des topographies adéquates pour l'analyse des aérosols de troposphère libre : le site ACTRIS/GAW du puy de Dôme (PUY, 1 465 m, France) et le site ACTRIS/GAW de Chacaltaya (CHC, 5 240 m, Bolivie). Ces deux sites disposent d'un large jeu de données in-situ et de télédétection. Les résultats montrent ainsi l'importance de la prise en compte de la structure verticale de l'atmosphère et de l'effet de l'humidité sur les propriétés des aérosols dans l'analyse des mesures. Pour la première fois à notre connaissance, l'utilisation de ces techniques instrumentales depuis la station de mesures météorologiques la plus haute du monde (Chacaltaya) a permis d'établir les propriétés optiques des aérosols dans cette région largement influencée par la ville de La Paz et par les émissions de la forêt amazonienne. Les résultats montrent que l'influence des feux de forêt amazoniens à la fin de la saison sèche peut accroitre les propriétés optiques de l'aérosol à cette altitude d'un facteur de 3,5 en moyenne et celles de la troposphère libre de 28 à 80%. La station est d'ailleurs régulièrement influencée par les conditions de la troposphère libre (30% du temps en journée et 60% la nuit). Ce manuscrit présente également des méthodes originales pour la détermination des contributions optiques et radiatives des aérosols de troposphère libre avec l'utilisation conjointe des mesures in-situ, photométriques et LIDAR. Les résultats établissent ainsi des contributions optiques de la troposphère libre au-dessus du puy de Dôme variant de 20%en hiver à 80% en été en moyenne. L'utilisation du modèle de transfert radiatif SBDART permet d'évaluer les contributions radiatives correspondantes qui oscillent entre 13 et 40% pour les courtes longueurs d'onde, soit des forçages radiatifs de -1 W.m-2 à -10 W.m-2. Les différentes sources d'aérosols en surface influencent donc fortement la composition de la troposphère libre, qu'il est alors nécessaire de prendre en compte dans le bilan radiatif global de notre planète.

Do You Really Care about Clouds, Aerosols and Climate Change ?

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ISBN 13 :
Total Pages : 306 pages
Book Rating : 4.:/5 (758 download)

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Book Synopsis Do You Really Care about Clouds, Aerosols and Climate Change ? by : Jérôme Riédi

Download or read book Do You Really Care about Clouds, Aerosols and Climate Change ? written by Jérôme Riédi and published by . This book was released on 2010 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nos activités ont porté à la fois sur le développement de moyens d'observations et sur la mise au point de nouvelles méthodes de restitution des propriétés des nuages et des aérosols, leur validation et l'analyse géophysique des produits dérivés pour application à la modélisation. Ces recherches mettent en œuvre principalement des observations depuis l'espace et visent, à travers la description à l'échelle globale des propriétés des nuages et des aérosols, à comprendre les processus qui gouvernent leur évolution. Dans un premier temps, les résultats obtenus ont principalement permis de mieux déterminer l'un des paramètres clés pour l'évolution d'un nuage et son impact radiatif : la phase thermodynamique de l'eau condensée. Par la suite, en cherchant à mieux comprendre les paramètres déterminant la phase du nuage, nous avons tenté d'établir les liens entre phase thermodynamique, propriétés microphysiques et conditions thermodynamique. Dans le même temps, les problématiques d'observation des nuages nous ont amené à nous pencher sur des questions plus générales de l'observation de l'atmosphère par télédétection concernant les aérosols et, de manière plus prospective, la vapeur d'eau. L'ensemble de ces travaux nous a conduit à proposer récemment un nouveau concept pour l'observation des nuages, des aérosols et de la vapeur d'eau depuis l'espace. Ce projet a été déposé auprès de l'Agence Spatiale Européenne (ESA) en réponse à son appel à idée pour la 8ème mission Earth Explorer. En remettant en perspective les travaux réalisés depuis dix ans, et concrétisés notamment au travers du projet récemment soumis à l'ESA, mais également en replaçant notre activité de recherche dans son contexte social, politique et économique, nous posons la question suivante sans avoir la prétention d'y répondre : "Qui se soucie vraiment des nuages, des aérosols et du climat ?"

MODELISATION ET OBSERVATION DE L'IMPACT RADIATIF DE L'AEROSOL MINERAL EN PRESENCE DE NUAGES SUR L'ATLANTIQUE TROPICAL ORIENTAL

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ISBN 13 :
Total Pages : 228 pages
Book Rating : 4.:/5 (863 download)

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Book Synopsis MODELISATION ET OBSERVATION DE L'IMPACT RADIATIF DE L'AEROSOL MINERAL EN PRESENCE DE NUAGES SUR L'ATLANTIQUE TROPICAL ORIENTAL by : FREDERIC.. PRADELLE

Download or read book MODELISATION ET OBSERVATION DE L'IMPACT RADIATIF DE L'AEROSOL MINERAL EN PRESENCE DE NUAGES SUR L'ATLANTIQUE TROPICAL ORIENTAL written by FREDERIC.. PRADELLE and published by . This book was released on 2001 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: CHAQUE ANNEE, PLUS DE 200 MT DE POUSSIERES MINERALES SAHARIENNES SONT EXPULSEES SUR L'ATLANTIQUE TROPICAL ORIENTAL. CES PARTICULES D'AEROSOLS, AU COURS DE LEUR TRANSPORT, VONT POUVOIR INTERAGIR AVEC LES NOMBREUX NUAGES PRESENTS AU-DESSUS DE L'OCEAN. CE TRAVAIL TENTE DE METTRE EN EVIDENCE CES INTERACTIONS ET DE QUANTIFIER L'IMPACT RADIATIF DE CES PARTICULES EN PRESENCE DE NUAGES. UNE ETUDE CLIMATOLOGIQUE A PERMIS DE DETERMINER LA POSITION RELATIVE DE LA COUVERTURE NUAGEUSE MOYENNE ET DES PANACHES DE PARTICULES MINERALES SUR L'OCEAN. EN ETE, LES PARTICULES SONT TRANSPORTEES EN ALTITUDE, AU-DESSUS DE LA COUCHE DES ALIZES OU SE FORMENT LES NUAGES. DES SIMULATIONS RADIATIVES MONTRENT QU'EN CETTE SAISON, LES PARTICULES MINERALES ABSORBENT UNE FRACTION DU RAYONNEMENT SOLAIRE (EFFET RADIATIF DIRECT) ET INDUISENT UNE DIMINUTION DE L'ALBEDO DU SYSTEME OCEAN/NUAGES/ATMOSPHERE DE L'ORDRE DE 15%, CE QUI SE TRADUIT PAR UN FORCAGE RADIATIF POSITIF SUR LA COLONNE. EN HIVER, LES NUAGES ET LES PANACHES DE PARTICULES SE SITUENT GENERALEMENT A LA MEME ALTITUDE, DANS LES BASSES COUCHES DES ALIZES. L'AEROSOL MINERAL, INITIALEMENT TRES PEU SOLUBLE, EST ALTERE AU COURS DE SON TRANSPORT ET ACQUIERE UNE FRACTION SOLUBLE QUI DEVRAIT LUI PERMETTRE D'AGIR COMME NOYAU DE CONDENSATION. DES SIMULATIONS MICROPHYSIQUES REVELENT QUE CES PARTICULES MINERALES, EN RAISON DE LEUR TAILLE IMPORTANTE, DEVRAIENT PROVOQUER UNE DIMINUTION DE L'ALBEDO DES NUAGES (EFFET RADIATIF INDIRECT). CET EFFET, RENFORCE PAR LA PRESENCE EN ALTITUDE DE PARTICULES CARBONEES EMISES PAR LES FEUX DE BROUSSE AFRICAINS, DEVRAIT CONDUIRE EN HIVER A UNE DIMINUTION DE L'ALBEDO DU SYSTEME COMPRISE ENTRE 5% ET 15%, ET ENCORE UNE FOIS A UN RECHAUFFEMENT DE LA COLONNE. ENFIN, UNE ETUDE BASEE SUR LE TRAITEMENT STATISTIQUE DE 6 ANNEES DE DONNEES METEOSAT NOUS A PERMIS DE VALIDER PARTIELLEMENT CES RESULTATS ET DE METTRE EN EVIDENCE L'IMPACT RADIATIF DES PARTICULES MINERALES SUR LE SYSTEME AU-DESSUS DE L'ATLANTIQUE TROPICAL ORIENTAL.

PASCAL.

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ISBN 13 :
Total Pages : 758 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis PASCAL. by :

Download or read book PASCAL. written by and published by . This book was released on 1991 with total page 758 pages. Available in PDF, EPUB and Kindle. Book excerpt:

ICREEC 2019

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Publisher : Springer Nature
ISBN 13 : 9811554447
Total Pages : 659 pages
Book Rating : 4.8/5 (115 download)

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Book Synopsis ICREEC 2019 by : Ahmed Belasri

Download or read book ICREEC 2019 written by Ahmed Belasri and published by Springer Nature. This book was released on 2020-06-10 with total page 659 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights peer reviewed articles from the 1st International Conference on Renewable Energy and Energy Conversion, ICREEC 2019, held at Oran in Algeria. It presents recent advances, brings together researchers and professionals in the area and presents a platform to exchange ideas and establish opportunities for a sustainable future. Topics covered in this proceedings, but not limited to, are photovoltaic systems, bioenergy, laser and plasma technology, fluid and flow for energy, software for energy and impact of energy on the environment.

Light Scattering by Ice Crystals

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Publisher : Cambridge University Press
ISBN 13 : 0521889162
Total Pages : 461 pages
Book Rating : 4.5/5 (218 download)

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Book Synopsis Light Scattering by Ice Crystals by : Kuo-Nan Liou

Download or read book Light Scattering by Ice Crystals written by Kuo-Nan Liou and published by Cambridge University Press. This book was released on 2016-10-06 with total page 461 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume outlines the fundamentals and applications of light scattering, absorption and polarization processes involving ice crystals.

Dew Water

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Publisher : CRC Press
ISBN 13 : 1000793915
Total Pages : 370 pages
Book Rating : 4.0/5 (7 download)

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Book Synopsis Dew Water by : Daniel Beysens

Download or read book Dew Water written by Daniel Beysens and published by CRC Press. This book was released on 2022-09-01 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: The world’s ever-increasing need for fresh water has led to the use of non-conventional sources such as rain and fog water collection. Although rain water collection is relatively simple, the supply is often erratic. Passive fog water collection has been used in several parts of the world but is only relevant to certain geographical locations. Dew occurrence, however, is far more widespread, can form in most climates and geographic settings, show high frequency and prevalence throughout the year. During the past 20 years, dew collection has therefore been investigated as a serious supplemental source of fresh water. Dew Water offers a thorough review of dew, its formation characteristics and potential for dew collection, for audiences that include policy-makers, non-governmental organizations involved in development aid and sustainable development, engineers, urban planners, researchers and students.After providing a background on atmospheric water, humid air, and sky and materials emissivity, the book deals with dew formation and its estimation with a focus on the use of meteorological data. Dew measurement techniques are reviewed and discussed as well as dew collection by passive means. Computational fluid dynamics technique is described for better design of dew collectors. Dew quality (chemistry, biology) is assessed in view of potable water quality. Costs and economic aspects are also considered.

Managing California's Snow Zone Lands for Water

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ISBN 13 :
Total Pages : 36 pages
Book Rating : 4.:/5 (319 download)

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Book Synopsis Managing California's Snow Zone Lands for Water by : Henry Walter Anderson

Download or read book Managing California's Snow Zone Lands for Water written by Henry Walter Anderson and published by . This book was released on 1963 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Études Sur Les Glaciers

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Publisher : Cambridge University Press
ISBN 13 : 1108049761
Total Pages : 363 pages
Book Rating : 4.1/5 (8 download)

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Book Synopsis Études Sur Les Glaciers by : Louis Agassiz

Download or read book Études Sur Les Glaciers written by Louis Agassiz and published by Cambridge University Press. This book was released on 2012-07-05 with total page 363 pages. Available in PDF, EPUB and Kindle. Book excerpt: The revolutionary glacial theory, proposed in this work of 1840, contributed to the demise of the myth of the great biblical flood.

Sustainable Aviation

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Publisher : Springer Nature
ISBN 13 : 303090895X
Total Pages : 222 pages
Book Rating : 4.0/5 (39 download)

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Book Synopsis Sustainable Aviation by : Judith L. Walls

Download or read book Sustainable Aviation written by Judith L. Walls and published by Springer Nature. This book was released on 2022-02-24 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book analyses from a management perspective how the aviation industry can achieve a sustainability transformation in order to reach the Paris climate targets for 2050 and provides various strategic and operational recommendations in this regard. It examines various elements of the aviation system exhaustively, including technologies, consumers, airlines, airports and policies, from both short- and long-term standpoints. Specific questions and contradictions, as well as concrete options for taking action, are presented. It also includes numerous practical case studies, which will help practitioners transfer the concepts into their everyday work. The book is aimed at a broad, professional audience consisting of managers, politicians and regulators, but also at advanced students engaged in academic and professional education.

The Mediterranean region under climate change

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Publisher : IRD Éditions
ISBN 13 : 2709922207
Total Pages : 736 pages
Book Rating : 4.7/5 (99 download)

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Book Synopsis The Mediterranean region under climate change by : Collectif

Download or read book The Mediterranean region under climate change written by Collectif and published by IRD Éditions. This book was released on 2018-11-19 with total page 736 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book has been published by Allenvi (French National Alliance for Environmental Research) to coincide with the 22nd Conference of Parties to the United Nations Framework Convention on Climate Change (COP22) in Marrakesh. It is the outcome of work by academic researchers on both sides of the Mediterranean and provides a remarkable scientific review of the mechanisms of climate change and its impacts on the environment, the economy, health and Mediterranean societies. It will also be valuable in developing responses that draw on “scientific evidence” to address the issues of adaptation, resource conservation, solutions and risk prevention. Reflecting the full complexity of the Mediterranean environment, the book is a major scientific contribution to the climate issue, where various scientific considerations converge to break down the boundaries between disciplines.

Climate Change and Aviation

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Publisher : Routledge
ISBN 13 : 1136569669
Total Pages : 410 pages
Book Rating : 4.1/5 (365 download)

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Book Synopsis Climate Change and Aviation by : Stefan Gossling

Download or read book Climate Change and Aviation written by Stefan Gossling and published by Routledge. This book was released on 2012-05-04 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: 'This is a timely, challenging and fascinating book on a topic of central importance to the success or otherwise of our climate change policies. It sets down a clear marker for what has to be done in the aviation sector.' Professor John Whitelegg, Stockholm Environment Institute, University of York, UK 'Climate Change and Aviation presents a clear picture of the transport sector's greatest challenge: how to reconcile aviation's immense popularity with its considerable environmental damage and its dependence on liquid hydrocarbon energy sources. This book avoids wishful thinking and takes the much harder, but more productive, path of considering difficult solutions that clash with short-term and short-sighted expectations about the unlimited growth potential for flying.' Professor Anthony Perl, Urban Studies Program, Simon Fraser University, Canada 'A convincing and timely collection that brings together an impressive range of expertise. The book integrates various perspectives into a powerful core argument - we must do something, and quickly, to tackle the impact of aviation on our environment. The authors recognise the political difficulties associated with promoting change but present constructive options for policy makers. Required reading, especially for transport ministers set on promoting the growth of air travel.' Professor Jon Shaw, Director of the Centre for Sustainable Transport, University of Plymouth, UK Trends such as the massive growth in availability of air travel and air freight are among those which have led to aviation becoming one of the fastest growing emitters of greenhouse gases. These trends have also caused a shift in expectations of how we do business, where we go on holiday, and what food and goods we can buy. For these reasons aviation is (and is set to stay) high up on global political, organizational and media agendas. This textbook is the first to attempt a comprehensive review of the topic, bringing together an international team of leading scientists. Starting with the science of the environmental issues, it moves on to cover drivers and trends of growth, socio-economics and politics, as well as mitigation options, the result being a broad yet detailed examination of the field. This is essential reading for undergraduate and postgraduate courses in transport, tourism, the environment, geography and beyond, while also being a valuable resource for professionals and policymakers seeking a clear understanding of this complex yet urgently pressing issue.

On the Phenomena of the Glacial Drift of Scotland

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ISBN 13 :
Total Pages : 192 pages
Book Rating : 4.:/5 (891 download)

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Book Synopsis On the Phenomena of the Glacial Drift of Scotland by : Archibald Geikie

Download or read book On the Phenomena of the Glacial Drift of Scotland written by Archibald Geikie and published by . This book was released on 1863 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Water Resources in the Mediterranean Region

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Publisher : Elsevier
ISBN 13 : 0128180862
Total Pages : 352 pages
Book Rating : 4.1/5 (281 download)

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Book Synopsis Water Resources in the Mediterranean Region by : Mehrez Zribi

Download or read book Water Resources in the Mediterranean Region written by Mehrez Zribi and published by Elsevier. This book was released on 2020-06-14 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: Water Resources in the Mediterranean Region summarizes and collates scientific developments around water resources in the Mediterranean socio-economic environment through a multidisciplinary framework synthesizing hydrology, hydrogeology, climate, bioclimatology, economics, and geography. As such, it provides essential information for any reader looking to learn more about the Mediterranean which is experiencing the impact of climate change and concurrent complex issues of anthropogenic effects, especially in agriculture and other resource uses. Water Resources in the Mediterranean Region covers different challenges in the issue of the evolution of water resources in the Mediterranean. It is intended for PhD students, research scientists, and managers interested in new solutions and approaches for water management and in the forecast of future water dynamics. Offers multidisciplinary content providing global visions of the challenges faced in the Mediterranean region Presents fundamental and operational studies, providing the reader with information on how to implement these actions and results themselves Written in a pedagogical manner, allowing for ease of reading for both researchers and water managers

Comparative Climatology of Terrestrial Planets

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Publisher : University of Arizona Press
ISBN 13 : 0816530599
Total Pages : 709 pages
Book Rating : 4.8/5 (165 download)

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Book Synopsis Comparative Climatology of Terrestrial Planets by : Stephen J. Mackwell

Download or read book Comparative Climatology of Terrestrial Planets written by Stephen J. Mackwell and published by University of Arizona Press. This book was released on 2014-01-30 with total page 709 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Through the contributions of more than sixty leading experts in the field, Comparative Climatology of Terrestrial Planets sets forth the foundations for this emerging new science and brings the reader to the forefront of our current understanding of atmospheric formation and climate evolution"--Provided by publisher.

Proceedings of UASG 2019

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Publisher : Springer Nature
ISBN 13 : 3030373932
Total Pages : 424 pages
Book Rating : 4.0/5 (33 download)

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Book Synopsis Proceedings of UASG 2019 by : Kamal Jain

Download or read book Proceedings of UASG 2019 written by Kamal Jain and published by Springer Nature. This book was released on 2020-02-22 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume gathers the latest advances, innovations, and applications in the field of geographic information systems and unmanned aerial vehicle (UAV) technologies, as presented by leading researchers and engineers at the 1st International Conference on Unmanned Aerial System in Geomatics (UASG), held in Roorkee, India on April 6-7, 2019. It covers highly diverse topics, including photogrammetry and remote sensing, surveying, UAV manufacturing, geospatial data sensing, UAV processing, visualization, and management, UAV applications and regulations, geo-informatics and geomatics. The contributions, which were selected by means of a rigorous international peer-review process, highlight numerous exciting ideas that will spur novel research directions and foster multidisciplinary collaboration among different specialists.

Plant Ecology

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ISBN 13 :
Total Pages : 144 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis Plant Ecology by : Unesco

Download or read book Plant Ecology written by Unesco and published by . This book was released on 1955 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: