Interannual And Decadal Variations Of Antarctic Ice Shelves Using Multi Mission Satellite Radar Altimetry And Links With Oceanic And Atmospheric Forcings

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Interannual and Decadal Variations of Antarctic Ice Shelves Using Multi-mission Satellite Radar Altimetry, and Links with Oceanic and Atmospheric Forcings

Author : Fernando Serrano Paolo
Publisher :
ISBN 13 : 9781339091860
Total Pages : 113 pages
Book Rating : 4.0/5 (918 download)

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Book Synopsis Interannual and Decadal Variations of Antarctic Ice Shelves Using Multi-mission Satellite Radar Altimetry, and Links with Oceanic and Atmospheric Forcings by : Fernando Serrano Paolo

Download or read book Interannual and Decadal Variations of Antarctic Ice Shelves Using Multi-mission Satellite Radar Altimetry, and Links with Oceanic and Atmospheric Forcings written by Fernando Serrano Paolo and published by . This book was released on 2015 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt: Antarctica's ice shelves, the floating extensions of the ice sheet, exert an important dynamic constraint on the flow of ice from the grounded ice sheet to the ocean, and hence on changes in global sea level. Thinning of an ice shelf reduces its ability to restrain the ice discharge from the grounded ice-sheet interior. Since the grounded ice sheet responds to perturbations in the ice shelves, predicting sea-level rise requires that we understand the processes that determine ice-shelf response to climate variability. Our understanding of these processes is, however, still too rudimentary to allow prediction of ice-sheet change under projected future climate states. This dissertation presents improved procedures to construct 18-year time series (1994-2012) of ice-shelf height around the entire Antarctic continent by merging data from multiple overlapping satellite radar altimeter missions (ERS-1, ERS-2, and Envisat). The resulting data set has a temporal resolution of 3 months and a spatial resolution of ~ 30 km. Improved procedures for trend analysis are introduced, and a more accurate alternative for uncertainty estimation to the standard error propagation approach is proposed. Ice-shelf height variability is analyzed using orthogonal-component decomposition of multivariate time series, spectral estimation and background-noise statistical tests. The derived data set and method allow to estimate, reliably and with defined formal uncertainties, the temporal progression and spatial structure of changes in ice-shelf height and volume in Antarctica between 1994 and 2012. The results reveal that, overall, Antarctic ice-shelf volume loss is accelerating. Furthermore, significant interannual variability in the Amundsen Sea ice shelves is strongly correlated with the low-frequency mode of El Niño-Southern Oscillation. These findings may ultimately allow us to understand the processes driving ice-shelf changes sufficiently to improve our models for predicting future ice loss.

Satellite Observations of Atmosphere-ice-ocean Interactions Around Antarctica

Author : Susheel Adusumilli
Publisher :
ISBN 13 :
Total Pages : 158 pages
Book Rating : 4.:/5 (126 download)

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Book Synopsis Satellite Observations of Atmosphere-ice-ocean Interactions Around Antarctica by : Susheel Adusumilli

Download or read book Satellite Observations of Atmosphere-ice-ocean Interactions Around Antarctica written by Susheel Adusumilli and published by . This book was released on 2021 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ongoing increases in global sea level, projected to continue through the 21st century, have widespread impacts on coastal communities and infrastructure. Uncertainties in model projections of Antarctic Ice Sheet mass represent a major contribution to uncertainties in projected sea level rise. Many modelling studies have identified the important role of climate variability in driving ice sheet change; however, there have not been sufficient observational studies on the impact of this variability on the ice sheet. The Antarctic Ice Sheet is vast, and remote; therefore, satellites are the only feasible instruments with which we can measure changes in ice mass. In particular, satellite radar and laser altimeter measurements of changes in ice sheet height are a valuable tool to monitor changes in mass of both grounded ice and floating ice shelves. In this dissertation, we use satellite altimetry together with other ancillary datasets to identify the influences of variability in atmospheric and oceanic conditions on ice sheet mass. We demonstrate of how satellite radar altimetry data can be used to identify the climate drivers ice shelf change during 1994-2016 in the Antarctic Peninsula, a region that has changed rapidly during that period. In the western Antarctic Peninsula, the rates of ocean-driven basal melting exceeded values required to maintain constant mass. Extending this analysis to all Antarctic ice shelves, we find large interannual variability in the total volume flux of freshwater due to basal melting exported into the Southern Ocean, with the highest values occurring during the late 2000s from ice shelves in West Antarctica. Finally, we demonstrate how laser altimetry can be used to monitor large changes in snowfall at seasonal time scales over the grounded portion of the West Antarctic Ice Sheet during the 2019. The results described in this dissertation together highlight the value of satellite altimetry in observing variability in ice sheet mass at seasonal to interannual time scales. We expect that they will help improve model projections of sea level rise through a better understanding of the processes driving ice sheet change, and by providing improved constraints on the current state of the atmosphere-ice-ocean system.

Thriving on Our Changing Planet

Author : National Academies of Sciences, Engineering, and Medicine
Publisher : National Academies Press
ISBN 13 : 0309467578
Total Pages : 717 pages
Book Rating : 4.3/5 (94 download)

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Book Synopsis Thriving on Our Changing Planet by : National Academies of Sciences, Engineering, and Medicine

Download or read book Thriving on Our Changing Planet written by National Academies of Sciences, Engineering, and Medicine and published by National Academies Press. This book was released on 2019-01-20 with total page 717 pages. Available in PDF, EPUB and Kindle. Book excerpt: We live on a dynamic Earth shaped by both natural processes and the impacts of humans on their environment. It is in our collective interest to observe and understand our planet, and to predict future behavior to the extent possible, in order to effectively manage resources, successfully respond to threats from natural and human-induced environmental change, and capitalize on the opportunities â€" social, economic, security, and more â€" that such knowledge can bring. By continuously monitoring and exploring Earth, developing a deep understanding of its evolving behavior, and characterizing the processes that shape and reshape the environment in which we live, we not only advance knowledge and basic discovery about our planet, but we further develop the foundation upon which benefits to society are built. Thriving on Our Changing Planet presents prioritized science, applications, and observations, along with related strategic and programmatic guidance, to support the U.S. civil space Earth observation program over the coming decade.

Sea-Level Rise for the Coasts of California, Oregon, and Washington

Author : National Research Council
Publisher : National Academies Press
ISBN 13 : 0309255945
Total Pages : 274 pages
Book Rating : 4.3/5 (92 download)

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Book Synopsis Sea-Level Rise for the Coasts of California, Oregon, and Washington by : National Research Council

Download or read book Sea-Level Rise for the Coasts of California, Oregon, and Washington written by National Research Council and published by National Academies Press. This book was released on 2012-12-06 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tide gauges show that global sea level has risen about 7 inches during the 20th century, and recent satellite data show that the rate of sea-level rise is accelerating. As Earth warms, sea levels are rising mainly because ocean water expands as it warms; and water from melting glaciers and ice sheets is flowing into the ocean. Sea-level rise poses enormous risks to the valuable infrastructure, development, and wetlands that line much of the 1,600 mile shoreline of California, Oregon, and Washington. As those states seek to incorporate projections of sea-level rise into coastal planning, they asked the National Research Council to make independent projections of sea-level rise along their coasts for the years 2030, 2050, and 2100, taking into account regional factors that affect sea level. Sea-Level Rise for the Coasts of California, Oregon, and Washington: Past, Present, and Future explains that sea level along the U.S. west coast is affected by a number of factors. These include: climate patterns such as the El Niño, effects from the melting of modern and ancient ice sheets, and geologic processes, such as plate tectonics. Regional projections for California, Oregon, and Washington show a sharp distinction at Cape Mendocino in northern California. South of that point, sea-level rise is expected to be very close to global projections. However, projections are lower north of Cape Mendocino because the land is being pushed upward as the ocean plate moves under the continental plate along the Cascadia Subduction Zone. However, an earthquake magnitude 8 or larger, which occurs in the region every few hundred to 1,000 years, would cause the land to drop and sea level to suddenly rise.

Polar Environments and Global Change

Author : Roger G. Barry
Publisher : Cambridge University Press
ISBN 13 : 1108423167
Total Pages : 445 pages
Book Rating : 4.1/5 (84 download)

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Book Synopsis Polar Environments and Global Change by : Roger G. Barry

Download or read book Polar Environments and Global Change written by Roger G. Barry and published by Cambridge University Press. This book was released on 2018-08-09 with total page 445 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surveys atmospheric, oceanic and cryospheric processes, present and past conditions, and changes in polar environments.

Antarctic Sea Ice Variability in the Southern Ocean-Climate System

Author : National Academies of Sciences, Engineering, and Medicine
Publisher : National Academies Press
ISBN 13 : 0309456002
Total Pages : 83 pages
Book Rating : 4.3/5 (94 download)

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Book Synopsis Antarctic Sea Ice Variability in the Southern Ocean-Climate System by : National Academies of Sciences, Engineering, and Medicine

Download or read book Antarctic Sea Ice Variability in the Southern Ocean-Climate System written by National Academies of Sciences, Engineering, and Medicine and published by National Academies Press. This book was released on 2017-04-24 with total page 83 pages. Available in PDF, EPUB and Kindle. Book excerpt: The sea ice surrounding Antarctica has increased in extent and concentration from the late 1970s, when satellite-based measurements began, until 2015. Although this increasing trend is modest, it is surprising given the overall warming of the global climate and the region. Indeed, climate models, which incorporate our best understanding of the processes affecting the region, generally simulate a decrease in sea ice. Moreover, sea ice in the Arctic has exhibited pronounced declines over the same period, consistent with global climate model simulations. For these reasons, the behavior of Antarctic sea ice has presented a conundrum for global climate change science. The National Academies of Sciences, Engineering, and Medicine held a workshop in January 2016, to bring together scientists with different sets of expertise and perspectives to further explore potential mechanisms driving the evolution of recent Antarctic sea ice variability and to discuss ways to advance understanding of Antarctic sea ice and its relationship to the broader ocean-climate system. This publication summarizes the presentations and discussions from the workshop.

The Ocean and Cryosphere in a Changing Climate

Author : Intergovernmental Panel on Climate Change (IPCC)
Publisher : Cambridge University Press
ISBN 13 : 9781009157971
Total Pages : 755 pages
Book Rating : 4.1/5 (579 download)

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Book Synopsis The Ocean and Cryosphere in a Changing Climate by : Intergovernmental Panel on Climate Change (IPCC)

Download or read book The Ocean and Cryosphere in a Changing Climate written by Intergovernmental Panel on Climate Change (IPCC) and published by Cambridge University Press. This book was released on 2022-04-30 with total page 755 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Intergovernmental Panel on Climate Change (IPCC) is the leading international body for assessing the science related to climate change. It provides policymakers with regular assessments of the scientific basis of human-induced climate change, its impacts and future risks, and options for adaptation and mitigation. This IPCC Special Report on the Ocean and Cryosphere in a Changing Climate is the most comprehensive and up-to-date assessment of the observed and projected changes to the ocean and cryosphere and their associated impacts and risks, with a focus on resilience, risk management response options, and adaptation measures, considering both their potential and limitations. It brings together knowledge on physical and biogeochemical changes, the interplay with ecosystem changes, and the implications for human communities. It serves policymakers, decision makers, stakeholders, and all interested parties with unbiased, up-to-date, policy-relevant information. This title is also available as Open Access on Cambridge Core.

Global Environmental Change

Author : National Research Council
Publisher : National Academies Press
ISBN 13 : 0309174325
Total Pages : 621 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Global Environmental Change by : National Research Council

Download or read book Global Environmental Change written by National Research Council and published by National Academies Press. This book was released on 1999-09-14 with total page 621 pages. Available in PDF, EPUB and Kindle. Book excerpt: How can we understand and rise to the environmental challenges of global change? One clear answer is to understand the science of global change, not solely in terms of the processes that control changes in climate and the composition of the atmosphere, but in how ecosystems and human society interact with these changes. In the last two decades of the twentieth century, a number of such research effortsâ€"supported by computer and satellite technologyâ€"have been launched. Yet many opportunities for integration remain unexploited, and many fundamental questions remain about the earth's capacity to support a growing human population. This volume encourages a renewed commitment to understanding global change and sets a direction for research in the decade ahead. Through case studies the book explores what can be learned from the lessons of the past 20 years and what are the outstanding scientific questions. Highlights include: Research imperatives and strategies for investigators in the areas of atmospheric chemistry, climate, ecosystem studies, and human dimensions of global change. The context of climate change, including lessons to be gleaned from paleoclimatology. Human responses toâ€"and forcing ofâ€"projected global change. This book offers a comprehensive overview of global change research to date and provides a framework for answering urgent questions.

Abstracts for the AGU Western Pacific Geophysics Meeting

Author :
Publisher :
ISBN 13 :
Total Pages : 170 pages
Book Rating : 4.5/5 (825 download)

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Book Synopsis Abstracts for the AGU Western Pacific Geophysics Meeting by :

Download or read book Abstracts for the AGU Western Pacific Geophysics Meeting written by and published by . This book was released on 1998 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Drivers of Change in East Antarctic Ice Shelves

Author : Chad Allen Greene
Publisher :
ISBN 13 :
Total Pages : 336 pages
Book Rating : 4.:/5 (12 download)

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Book Synopsis Drivers of Change in East Antarctic Ice Shelves by : Chad Allen Greene

Download or read book Drivers of Change in East Antarctic Ice Shelves written by Chad Allen Greene and published by . This book was released on 2017 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: Antarctica holds enough landlocked ice to raise the global sea level by nearly 60 m in the event of wholesale ice sheet collapse. In East Antarctica, the Aurora Subglacial Basin is drained by Totten Glacier and is one of the world’s largest and most rapidly-changing ice catchment systems. In recent decades, Totten Glacier has exhibited variability in its flow rate, mass balance, and ice thickness, each led by changes at the ice sheet margin. Totten Glacier dynamics are linked to processes in the Totten Ice Shelf, which buttresses the flow of grounded ice while being subjected to variable ocean forcing from below. Understanding the stability of the Aurora Subglacial Basin in a changing climate requires an understanding of how Totten Ice Shelf responds to changes in its environment. This dissertation investigates ice shelf processes on spatial scales of 1 km to 100 km, that act on sub-annual to decadal time scales. The independent roles of channelized basal melt and large-scale basal melt resulting from a variable supply of oceanic heat content are examined using surface elevation changes measured by airborne laser altimetry, satellite laser altimetry, and a new method of photometry applied to satellite images. A new method of satellite image template matching is also developed to understand ice shelf velocity response to several environmental forcing mechanisms. On the interannual time scale, Totten Ice Shelf is seen accelerating in response to nearby upwelling of warm circumpolar deep water that enhances basal melt rates. On the subannual time scale, Totten Ice Shelf exhibits winter slowdown as buttressing from seasonal landfast sea ice at the ice shelf front slows the flow of the glacier. These findings show that the Totten Glacier catchment is sensitive to changes in its environment, and may be susceptible to changes in the coastal wind stress projected for the 21st century.

Decadal Mass Balance of the Antarctic Ice Sheet from Satellite Radar Altimetry and Its Contribution

Author : Yonghong Li
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (319 download)

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Book Synopsis Decadal Mass Balance of the Antarctic Ice Sheet from Satellite Radar Altimetry and Its Contribution by : Yonghong Li

Download or read book Decadal Mass Balance of the Antarctic Ice Sheet from Satellite Radar Altimetry and Its Contribution written by Yonghong Li and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this research, we estimated the decadal mass balance of the Antarctic ice sheet using the European Space Agency's ERS-1 and ERS-2 satellite radar altimeter data over the time period of 1992 - 2003. Several techniques are developed to improve the processing and analysis of both low and high resolution elevation change time series. Our research results show that the majority of the East Antarctica interior regions are thickening, and this is probably caused by increased precipitation. Finally, many coastal areas, especially in West Antarctica, are experiencing strongly negative elevation change. These thinning trends are probably due to high heat fluxes, ocean warming, and/or basal melting. The overall estimate of Antarctic elevation change north of 81.6°S corresponds to global sea level increase of 0.07 mm/yr based on the high-resolution interior and coastal results.

Seasonal, Interannual and Long-term Changes in the Surface Elevation of the East Antarctic Ice Sheet from Satellite Radar Altimetry

Author : Gang Feng
Publisher :
ISBN 13 :
Total Pages : 124 pages
Book Rating : 4.:/5 (467 download)

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Book Synopsis Seasonal, Interannual and Long-term Changes in the Surface Elevation of the East Antarctic Ice Sheet from Satellite Radar Altimetry by : Gang Feng

Download or read book Seasonal, Interannual and Long-term Changes in the Surface Elevation of the East Antarctic Ice Sheet from Satellite Radar Altimetry written by Gang Feng and published by . This book was released on 1999 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Ocean, Ice, and Atmosphere

Author : Stanley S. Jacobs
Publisher : American Geophysical Union
ISBN 13 :
Total Pages : 400 pages
Book Rating : 4.:/5 (318 download)

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Book Synopsis Ocean, Ice, and Atmosphere by : Stanley S. Jacobs

Download or read book Ocean, Ice, and Atmosphere written by Stanley S. Jacobs and published by American Geophysical Union. This book was released on 1998-02-04 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this latest oceanology volume of the Antarctic Research Series, polar scientists describe and model air-sea and ice-ocean interactions, the formation and chemistry of deep and bottom waters, regional circulations, tidal heights and currents, ocean bathymetry, interannual variability and the Antarctic Slope Front.

Decade-to-Century-Scale Climate Variability and Change

Author : National Research Council
Publisher : National Academies Press
ISBN 13 : 0309060982
Total Pages : 161 pages
Book Rating : 4.3/5 (9 download)

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Book Synopsis Decade-to-Century-Scale Climate Variability and Change by : National Research Council

Download or read book Decade-to-Century-Scale Climate Variability and Change written by National Research Council and published by National Academies Press. This book was released on 1998-12-24 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt: Society today may be more vulnerable to global-scale, long-term, climate change than ever before. Even without any human influence, past records show that climate can be expected to continue to undergo considerable change over decades to centuries. Measures for adaption and mitigation will call for policy decisions based on a sound scientific foundation. Better understanding and prediction of climate variations can be achieved most efficiently through a nationally recognized "dec-cen" science plan. This book articulates the scientific issues that must be addressed to advance us efficiently toward that understanding and outlines the data collection and modeling needed.

Natural Climate Variability on Decade-to-Century Time Scales

Author : National Research Council
Publisher : National Academies Press
ISBN 13 : 0309054494
Total Pages : 645 pages
Book Rating : 4.3/5 (9 download)

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Book Synopsis Natural Climate Variability on Decade-to-Century Time Scales by : National Research Council

Download or read book Natural Climate Variability on Decade-to-Century Time Scales written by National Research Council and published by National Academies Press. This book was released on 1996-08-30 with total page 645 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume reflects the current state of scientific knowledge about natural climate variability on decade-to-century time scales. It covers a wide range of relevant subjects, including the characteristics of the atmosphere and ocean environments as well as the methods used to describe and analyze them, such as proxy data and numerical models. They clearly demonstrate the range, persistence, and magnitude of climate variability as represented by many different indicators. Not only do natural climate variations have important socioeconomic effects, but they must be better understood before possible anthropogenic effects (from greenhouse gas emissions, for instance) can be evaluated. A topical essay introduces each of the disciplines represented, providing the nonscientist with a perspective on the field and linking the papers to the larger issues in climate research. In its conclusions section, the book evaluates progress in the different areas and makes recommendations for the direction and conduct of future climate research. This book, while consisting of technical papers, is also accessible to the interested layperson.

EOS Science Plan

Author :
Publisher :
ISBN 13 :
Total Pages : 406 pages
Book Rating : 4.3/5 ( download)

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Book Synopsis EOS Science Plan by :

Download or read book EOS Science Plan written by and published by . This book was released on 1999 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt:

The Anthropocene as a Geological Time Unit

Author : Jan Zalasiewicz
Publisher : Cambridge University Press
ISBN 13 : 110847523X
Total Pages : 385 pages
Book Rating : 4.1/5 (84 download)

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Book Synopsis The Anthropocene as a Geological Time Unit by : Jan Zalasiewicz

Download or read book The Anthropocene as a Geological Time Unit written by Jan Zalasiewicz and published by Cambridge University Press. This book was released on 2019-03-07 with total page 385 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reviews the evidence underpinning the Anthropocene as a geological epoch written by the Anthropocene Working Group investigating it. The book discusses ongoing changes to the Earth system within the context of deep geological time, allowing a comparison between the global transition taking place today with major transitions in Earth history.