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Author: University College, London
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Languages : en
Pages :
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Author: University College, London
Publisher:
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Category :
Languages : en
Pages :
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Author:
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ISBN:
Category : Altitudes
Languages : en
Pages : 0
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Author: Jérôme Benveniste
Publisher: Springer
ISBN: 9783642226786
Category : Technology & Engineering
Languages : en
Pages : 500
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Book Description
This book will bring an integrated view of the state-of-the art in the matter to the water scientists eager to add Radar Altimetry to their toolkit. It describes experience in application of satellite altimetry to the different inland seas, lakes and rivers in the World. It presents the principal problems related to the altimetry derived products in inland seas, lakes and rivers and ways of their improvement. This publication is based on numerous satellite and observational data collected and analyzed by the authors of the various chapters in the framework of a set of international projects, performed in Europe, Russia, USA, and China. The book will contribute both to the ongoing International Altimeter Service effort and to the building of a sustained Continental Water observing system in the perspective of GMES and GEOSS initiatives, supplied with satellite data from the series of Sentinel-3 satellites, the Jason series and further on the revolutionary SWOT Satellite Mission. This book is aimed at specialists concerned with research in the various fields of satellite altimetry and remote sensing of Continental Waters. The book will also be interesting for lecturers, students and post-graduate students. Pratical applications stemming from the book content will be supported by, and can be advertised through, the ESA-CNES Basic Radar Altimetry Toolbox and its Radar Altimetry Tutorial ( http://earth.esa.int/brat, http://www.altimetry.info )
Author:
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Category :
Languages : en
Pages : 300
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Category :
Languages : en
Pages :
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Author: Fangfang Yao
Publisher:
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Category :
Languages : en
Pages :
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Lakes and reservoirs are essential components of the global hydrological cycle. They function as sentinels of climate change, and provide indispensable water supply, energy generation, aquatic ecosystems for meeting agricultural, industrial, and domestic needs. Despite the importance of lakes and reservoirs to natural systems and human societies, their water storage dynamics are poorly understood on a global scale, especially in remote and harsh environments such as the Tibetan Plateau. The challenge has been even amplified by the currently declining global network of gauging measurements. This knowledge gap prevents a fundamental understanding of the terrestrial water cycle and surface water availability, and thus impedes effective water resource management. Recent regional evidence has suggested that water-abundant regions show increasing trends in surface water extents whereas water-limited regions exhibit decreasing trends. However, whether this divergence also holds true for the storage of open water bodies across the entire land surface remains unknown. A synergy of fine resolution optical imagery and level measurements by satellite altimetry has the potential to accurately deduce lake/reservoir storage variations. However, the existing estimates of lake/reservoir storage changes are mostly limited by the number/size of studied water bodies and the low temporal frequencies in time series, primarily owing to atmospheric contaminations in satellite imagery and inadequate spatiotemporal coverage in altimetry. This dissertation aims to mitigate the above technical limitations through several remote sensing method advancements, and to leverage multi-mission satellites to investigate the recent lake/reservoir storage dynamics and their implications for the regional and global water cycles. Specifically, this dissertation is orientated to three overarching questions: 1) how has the lake water storage across the landlocked inner Tibetan Plateau changed over the recent decades and what was the dominant driver? 2) Can we improve the methodology of lake/reservoir area time series mapping in order to better enable a temporarily consistent monitoring of water storage dynamics in the world? 3) Did the recent trends in global open-surface water storage exhibit a divergence between arid and humid regions, and if so, what does this divergence indicate for the global water cycle and water management? The above questions were addressed in three chapters. Chapter 2 provides a comprehensive and spatially explicit quantification of lake storage changes across the inner Tibetan Plateau since 2002, through a synergy of satellite imagery and freely-available digital elevation models. By further incorporating satellite gravity observations to a water balance model, the dominant driver of this regional lake storage variation was attributed to net precipitation, i.e., precipitation minus evapotranspiration, rather than glacial melting. Chapter 3 introduces a novel method that substantially improves the temporal coverage in lake/reservoir area mapping, by effectively recovering inundation areas from contaminated spectral images with a relative error of 2.2%. Inclusion of recovered water areas from contaminated images improved the monthly coverage for 400+ lakes and reservoirs in the world by an average of 43%. Chapter 4 combines this novel mapping method and a constellation of satellite altimeters to reveal monthly storage changes in 1000+ major lakes/reservoirs worldwide from 1992 to 2018, the entire satellite altimetry era thus far. The finding confirms a multi-decadal divergence in global open-surface water storage between endorheic (arid/semiarid) and exorheic (more humid) regions. This divergence indicates an amplified contrast between fresh and saline water abundance, and was partially induced by the increasing water impoundment behind dams. Due to the divergence, global lakes and reservoirs slowed down the observed sea level rise by only ~1% during the past nearly three decades.
Author: Chester John Koblinsky
Publisher:
ISBN:
Category : Altimeter
Languages : en
Pages : 90
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Author: Rene Forsberg
Publisher: Springer Science & Business Media
ISBN: 3642722458
Category : Science
Languages : en
Pages : 568
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Book Description
Based on the IAG scientific assembly in Rio de Janeiro, Brazil, this volume combines papers in the fields of gravity and geoid, geodynamics, and geodesy in Antarctica. The volume contains papers on recent progress in absolute and relative gravimetry, on models of the global gravity field, theoretical developments in physical geodesy, and many examples of regional gravity field and geoid models. Geodynamics chapters include papers on earth rotation and geopotential variations, reference frames and global deformations, as well as a section on the combination of space and terrestrial methods for deformation observations. The current status of geodesy in Antarctica is illustrated by a number of papers.
Author: Stelios P. Mertikas
Publisher: Springer Science & Business Media
ISBN: 364210634X
Category : Science
Languages : en
Pages : 682
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Book Description
These Proceedings include the written version of papers presented at the IAG International Symposium on "Gravity, Geoid and Earth Observation 2008". The Symposium was held in Chania, Crete, Greece, 23-27 June 2008 and organized by the Laboratory of Geodesy and Geomatics Engineering, Technical University of Crete, Greece. The meeting was arranged by the International Association of Geodesy and in particular by the IAG Commission 2: Gravity Field. The symposium aimed at bringing together geodesists and geophysicists working in the general areas of gravity, geoid, geodynamics and Earth observation. Besides covering the traditional research areas, special attention was paid to the use of geodetic methods for: Earth observation, environmental monitoring, Global Geodetic Observing System (GGOS), Earth Gravity Models (e.g., EGM08), geodynamics studies, dedicated gravity satellite missions (i.e., GOCE), airborne gravity surveys, Geodesy and geodynamics in polar regions, and the integration of geodetic and geophysical information.
Author: Detlef Stammer
Publisher: CRC Press
ISBN: 1498743463
Category : Science
Languages : en
Pages : 617
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Satellite remote sensing, in particular by radar altimetry, is a crucial technique for observations of the ocean surface and of many aspects of land surfaces, and of paramount importance for climate and environmental studies. This book provides a state-of-the-art overview of the satellite altimetry techniques and related missions, and reviews the most-up-to date applications to ocean dynamics and sea level. It also discusses related space-based observations of the ocean surface and of the marine geoid, as well as applications of satellite altimetry to the cryosphere and land surface waters; operational oceanography and its applications to navigation, fishing and defense.
