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Author: Jean Carlos Montero Serrano
Publisher:
ISBN:
Category :
Languages : en
Pages : 286
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Book Description
Les objectifs de cette thèse sont d'étudier la sédimentation dans des sous bassins privilégiés du Golfe du Mexique (Bassin de Pigmy et de La Salle) afin de reconstituer la variabilité des apports détritiques via le fleuve Mississippi au cours du dernier cycle climatique. Une approche intégrée couplant minéralogie, granulométrie, géochimie élémentaire et organique, dans un cadre chronostratigraphique précis, a permis de progresser dans la compréhension des relations entre les mécanismes climatiques de moyenne et haute latitude et l'hydrologie du domaine subtropical et de proposer des schémas d'interprétation du couplage océan-atmosphère. La minéralogie contrastée des zones en érosion drainées par le système fluviatile du bassin versant du Mississippi permet de contraindre les zones continentales qui vont successivement alimenter la sédimentation du Golfe du Mexique. Les modifications des sources détritiques ainsi mises en évidence au cours du dernier cycle climatique ont permis (1) de contraindre la localisation des zones de déstabilisation de la marge Laurentide et l'enchaînement des processus sédimentaires lors des décharges d'eau douce qui caractérisent la dernière déglaciation, (2) de mettre en évidence une modification du front de précipitations associée aux périodes de mégacrue du Mississippi lors des périodes interglaciaires et d'en déduire des informations sur le régime hydrologique et (3) de suggérer des schémas de transferts méridiens d'humidité contrastés lors des stades interglaciaires 1 et 5e, suggérant des configurations atmosphériques sensiblement différentes. La confrontation de ces résultats avec d'autres données paléoclimatiques a alors permis de proposer plusieurs modèles simples pour les interactions océan-atmosphère dans le Golfe du Mexique, basés sur les modifications des configurations atmosphériques (Jet Stream et ITCZ) et océaniques (extension de l'Atlantic Warm Pool) et confirme le rôle majeur de l'atmosphère comme vecteur de la variabilité climatique rapide.
Author: Jean Carlos Montero Serrano
Publisher:
ISBN:
Category :
Languages : en
Pages : 286
Get Book Here
Book Description
Les objectifs de cette thèse sont d'étudier la sédimentation dans des sous bassins privilégiés du Golfe du Mexique (Bassin de Pigmy et de La Salle) afin de reconstituer la variabilité des apports détritiques via le fleuve Mississippi au cours du dernier cycle climatique. Une approche intégrée couplant minéralogie, granulométrie, géochimie élémentaire et organique, dans un cadre chronostratigraphique précis, a permis de progresser dans la compréhension des relations entre les mécanismes climatiques de moyenne et haute latitude et l'hydrologie du domaine subtropical et de proposer des schémas d'interprétation du couplage océan-atmosphère. La minéralogie contrastée des zones en érosion drainées par le système fluviatile du bassin versant du Mississippi permet de contraindre les zones continentales qui vont successivement alimenter la sédimentation du Golfe du Mexique. Les modifications des sources détritiques ainsi mises en évidence au cours du dernier cycle climatique ont permis (1) de contraindre la localisation des zones de déstabilisation de la marge Laurentide et l'enchaînement des processus sédimentaires lors des décharges d'eau douce qui caractérisent la dernière déglaciation, (2) de mettre en évidence une modification du front de précipitations associée aux périodes de mégacrue du Mississippi lors des périodes interglaciaires et d'en déduire des informations sur le régime hydrologique et (3) de suggérer des schémas de transferts méridiens d'humidité contrastés lors des stades interglaciaires 1 et 5e, suggérant des configurations atmosphériques sensiblement différentes. La confrontation de ces résultats avec d'autres données paléoclimatiques a alors permis de proposer plusieurs modèles simples pour les interactions océan-atmosphère dans le Golfe du Mexique, basés sur les modifications des configurations atmosphériques (Jet Stream et ITCZ) et océaniques (extension de l'Atlantic Warm Pool) et confirme le rôle majeur de l'atmosphère comme vecteur de la variabilité climatique rapide.
Author: Richard A. Davis
Publisher: Texas A&M University Press
ISBN: 1603442243
Category : Science
Languages : en
Pages : 185
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Book Description
A must-read for Gulf Coast scientists, naturalists, and residents . . . From Florida to Mexico and along the shores of Cuba, the coasts of the Gulf of Mexico are vulnerable to sea-level rise because of their fragile and low-lying shorelines and adjacent coastal environments. In addition to wetlands, river deltas, beaches, and barrier islands, millions of people who live and work along the Gulf coast are susceptible to the affects of both intense storms in the short term and a gradual rise in sea level over the longer term. While global warming headlines any current discussion of this topic and is certainly a major factor in sea-level change, it is not the only factor. Earthquakes and other crustal shifts, the El Niño/La Niña phenomena, river impoundment and sedimentation, tides, and weather can all affect local, regional, and global sea levels. In Sea-Level Change in the Gulf of Mexico, Richard A. Davis Jr. looks at the various causes and effects of rising and falling sea levels in the Gulf of Mexico, beginning with the Gulf’s geological birth over 100 million years ago, and focusing on the last 20,000 years, when global sea levels began rising as the glaciers of the last major ice age melted. Davis reviews the current situation, especially regarding beach erosion and loss of wetlands, and offers a preview of the future, when the Gulf Coast will change markedly as the twenty-first century progresses. Amply illustrated and written in a clear, straightforward style, Sea-Level Change in the Gulf of Mexico is a valuable resource for anyone who cares deeply about understanding the past, present, and future of life along the coast of the Gulf of Mexico.
Author: Charles S. Adams
Publisher:
ISBN:
Category : Mexico, Gulf of
Languages : en
Pages : 34
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Book Description
Author: Thomas M. Cronin
Publisher: Columbia University Press
ISBN: 0231144946
Category : Science
Languages : en
Pages : 465
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Book Description
"When combined with computer model simulations, paleoclimatic reconstructions are used to test hypotheses about the causes of climatic change, such as greenhouse gases, solar variability, earth's orbital variations, and hydrological, oceanic, and tectonic processes, This book is a comprehensive, state-of-the art synthesis of paleoclimate research covering all geological timescales, emphasizing topics that shed light on modern trends in the earth's climate." --Book Jacket.
Author: Jacek Raddatz
Publisher: Frontiers Media SA
ISBN: 2832504167
Category : Science
Languages : en
Pages : 142
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Book Description
Author: John B. Anderson
Publisher: Geological Society of America
ISBN: 0813724430
Category : Science
Languages : en
Pages : 156
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Book Description
One of the main impacts of global warming is accelerated sea-level rise: Intergovernmental Panel on Climate Change predictions suggest that the rate of rise could reach as high as 5'10 mm/yr by the end of this century. While it is generally recognized that accelerated sea-level rise will severely impact low-gradient coastlines, scientists are still ill prepared to predict coastal response. A study of seven Gulf Coast estuaries (Mobile Bay and Mississippi Sound, Weeks Bay, Calcasieu Lake, Sabine Lake, Galveston Bay, Matagorda Bay, and Corpus Christi Bay) was aimed at examining their response to past changes in the rate of sea-level rise and climate. The rates of change are of the same magnitude as those predicted for this century. The estuarine response to change has been one of abrupt landward retreat and major reorganization of estuarine environments at decadal time scales. This book should be of interest to scientists and policy makers concerned with future impacts of global warming.
Author: Harunur Rashid
Publisher: John Wiley & Sons
ISBN: 111867152X
Category : Science
Languages : en
Pages : 669
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Book Description
Published by the American Geophysical Union as part of the Geophysical Monograph Series, Volume 193. Abrupt Climate Change: Mechanisms, Patterns, and Impacts brings together a diverse group of paleoproxy records such as ice cores, marine sediments, terrestrial (lakes and speleothems) archives, and coupled ocean-atmosphere climate models to document recent advances in understanding the mechanisms of abrupt climate changes. Since the discovery of the Dansgaard-Oeschger events in Greenland ice cores and the subsequent discovery of their contemporary events in the marine sediments of the North Atlantic, the search for these abrupt, millennial-scale events across the globe has intensified, and as a result, the number of paleoclimatic records chronicling such events has increased. The volume highlights include discussions of records of past climate variability, meridional overturning circulation, land-ocean-atmosphere interactions, feedbacks in the climate system, and global temperature anomalies. Abrupt Climate Change will be of interest to students, researchers, academics, and policy makers who are concerned about abrupt climate change and its potential impact on society.
Author: Keith D. Alverson
Publisher: Springer Science & Business Media
ISBN: 3642558283
Category : Science
Languages : en
Pages : 242
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Book Description
This book provides a synthesis of the past decade of research into global changes that occurred in the earth system in the past. Focus is achieved by concentrating on those changes in the Earth's past environment that best inform our evaluation of current and future global changes and their consequences for human populations. The book stands as a ten year milestone in the operation of the Past Global Changes (PAGES) Project of the International Geosphere-Biosphere Programme (IGBP). It seeks to provide a quantitative understanding of the Earth’s environment in the geologically recent past and to define the envelope of natural environmental variability against which anthropogenic impacts on the Earth System may be assessed. A set of color overhead transparencies based on the figures in the book is available free on the PAGES website (www.pages-igbp.org) for use in teaching and lecturing.
Author: Jian Liu
Publisher: Frontiers Media SA
ISBN: 2832546161
Category : Science
Languages : en
Pages : 142
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Book Description
The Yangtze River (Changjiang) and the Red River (Song Hong) that originate in highlands of the Himalayas and Tibetan Plateau, two of the largest rivers in East and Southeast Asia in terms of water and sediment discharge into oceans, play a pivotal role in the global biogeochemical cycle. The Yangtze River Delta is located at the west coast of the East China Sea and the Red River delta at the west coast of the Gulf of Tonkin in the South China Sea. Both were initiated during the early to middle Holocene.
Author: Frank Oldfield
Publisher: Cambridge University Press
ISBN: 9780521829366
Category : Nature
Languages : en
Pages : 392
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Book Description
Advanced non-specialist textbook explaining the significance of past and contemporary environmental and climatic change.
