Tree-ring Measurements as a Proxy of Glacier Mass Balance at Mount Baker, Washington, USA PDF Download
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Author: Amanda M. Doremus
Publisher:
ISBN: 9780355252118
Category :
Languages : en
Pages : 45
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Book Description
A 243-year mass balance record was reconstructed for Easton Glacier at Mount Baker, Washington, USA, using annual ring-width measurements of mountain hemlock tree cores. Tree cores were collected on the lateral moraines of Easton Glacier and were measured and analyzed to create a site tree-ring chronology. The tree-ring chronology presented in this study responds to the same climatic forcings as glacier mass balance, mainly wintertime precipitation and summertime temperatures, providing validation for our linear regression model which uses the tree-ring chronology to reconstruct glacier annual net mass balance. Transformations were tested and applied to the data to improve the performance of the model, and a final mass-balance record for Easton Glacier and a regional index were created and analyzed for the period of AD 1770-2012. The final Easton Glacier and regional reconstructions explain 48% and 42%, respectively, of the variance in the mass balance data. Periods of above-average mass balance of Easton Glacier were identified between AD 1800-1820, AD 1845-1853, AD 1893-1927, and AD 1952-1985. Periods of predominately below-average mass balance were shown between AD 1780-1800, AD 1834-1844, AD 1884-1892, AD 1928-1951, and AD 1985-2005. Our record is consistent with known dated moraine positions and with other proxy records in the surrounding region. It also corresponds well with positive and negative phases of the Pacific Decadal Oscillation, emphasizing the influence of wintertime precipitation variability on the mass balance of glaciers in the North Cascades.
Author: Amanda M. Doremus
Publisher:
ISBN: 9780355252118
Category :
Languages : en
Pages : 45
Get Book Here
Book Description
A 243-year mass balance record was reconstructed for Easton Glacier at Mount Baker, Washington, USA, using annual ring-width measurements of mountain hemlock tree cores. Tree cores were collected on the lateral moraines of Easton Glacier and were measured and analyzed to create a site tree-ring chronology. The tree-ring chronology presented in this study responds to the same climatic forcings as glacier mass balance, mainly wintertime precipitation and summertime temperatures, providing validation for our linear regression model which uses the tree-ring chronology to reconstruct glacier annual net mass balance. Transformations were tested and applied to the data to improve the performance of the model, and a final mass-balance record for Easton Glacier and a regional index were created and analyzed for the period of AD 1770-2012. The final Easton Glacier and regional reconstructions explain 48% and 42%, respectively, of the variance in the mass balance data. Periods of above-average mass balance of Easton Glacier were identified between AD 1800-1820, AD 1845-1853, AD 1893-1927, and AD 1952-1985. Periods of predominately below-average mass balance were shown between AD 1780-1800, AD 1834-1844, AD 1884-1892, AD 1928-1951, and AD 1985-2005. Our record is consistent with known dated moraine positions and with other proxy records in the surrounding region. It also corresponds well with positive and negative phases of the Pacific Decadal Oscillation, emphasizing the influence of wintertime precipitation variability on the mass balance of glaciers in the North Cascades.
Author: Miriam Jones
Publisher: Frontiers Media SA
ISBN: 2889633373
Category :
Languages : en
Pages : 208
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Book Description
The vast area of the North Pacific, spanning ~55˚ longitude, represents a challenge for documenting and understanding the geologic history of ocean, atmosphere, and terrestrial environmental change. Nevertheless, its importance for many issues, including our fundamental understanding of ocean and atmospheric circulation patterns and teleconnections with natural modes of climate variability through time, has led to a steady rise in the numbers of study sites and proxy types. By bringing together a wide range of proxies and timescales that examine the impacts of paleoclimate on ecosystems, water, carbon, and humans, and interactions between marine and terrestrial processes, this Research Topic contributes to an improved understanding of the region’s significance at global, hemispheric, and regional scales.
Author:
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 398
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Book Description
Author: James H. Speer
Publisher: University of Arizona Press
ISBN: 0816526850
Category : Science
Languages : en
Pages : 360
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Book Description
This comprehensive text addresses all of the subjects that a reader who is new to the field will need to know and will be a welcome reference for practitioners at all levels. It includes a history of the discipline, biological and ecological background, principles of the field, basic scientific information on the structure and growth of trees, the complete range of dendrochronology methods, and a full description of each of the relevant subdisciplines.
Author: National Research Council
Publisher: National Academies Press
ISBN: 0309102251
Category : Science
Languages : en
Pages : 160
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Book Description
In response to a request from Congress, Surface Temperature Reconstructions for the Last 2,000 Years assesses the state of scientific efforts to reconstruct surface temperature records for Earth during approximately the last 2,000 years and the implications of these efforts for our understanding of global climate change. Because widespread, reliable temperature records are available only for the last 150 years, scientists estimate temperatures in the more distant past by analyzing "proxy evidence," which includes tree rings, corals, ocean and lake sediments, cave deposits, ice cores, boreholes, and glaciers. Starting in the late 1990s, scientists began using sophisticated methods to combine proxy evidence from many different locations in an effort to estimate surface temperature changes during the last few hundred to few thousand years. This book is an important resource in helping to understand the intricacies of global climate change.
Author: Julie Koppel Maldonado
Publisher: Springer
ISBN: 3319052667
Category : Science
Languages : en
Pages : 178
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Book Description
With a long history and deep connection to the Earth’s resources, indigenous peoples have an intimate understanding and ability to observe the impacts linked to climate change. Traditional ecological knowledge and tribal experience play a key role in developing future scientific solutions for adaptation to the impacts. The book explores climate-related issues for indigenous communities in the United States, including loss of traditional knowledge, forests and ecosystems, food security and traditional foods, as well as water, Arctic sea ice loss, permafrost thaw and relocation. The book also highlights how tribal communities and programs are responding to the changing environments. Fifty authors from tribal communities, academia, government agencies and NGOs contributed to the book. Previously published in Climatic Change, Volume 120, Issue 3, 2013.
Author: National Research Council
Publisher: National Academies Press
ISBN: 0309054494
Category : Science
Languages : en
Pages : 645
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Book Description
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.
Author: Mike Walker
Publisher: John Wiley & Sons
ISBN: 1118700090
Category : Science
Languages : en
Pages : 311
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Book Description
This introductory textbook introduces the basics of dating, the range of techniques available and the strengths and limitations of each of the principal methods. Coverage includes: the concept of time in Quaternary Science and related fields the history of dating from lithostratigraphy and biostratigraphy the development and application of radiometric methods different methods in dating: radiometric dating, incremental dating, relative dating and age equivalence Presented in a clear and straightforward manner with the minimum of technical detail, this text is a great introduction for both students and practitioners in the Earth, Environmental and Archaeological Sciences. Praise from the reviews: "This book is a must for any Quaternary scientist." SOUTH AFRICAN GEOGRAPHICAL JOURNAL, September 2006 “...very well organized, clearly and straightforwardly written and provides a good overview on the wide field of Quaternary dating methods...” JOURNAL OF QUATERNARY SCIENCE, January 2007
Author: U.S. Geological Survey
Publisher:
ISBN: 9781782662174
Category : Science
Languages : en
Pages : 396
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Book Description
Author: U.S. Global Change Research Program
Publisher: Cambridge University Press
ISBN: 0521144078
Category : Business & Economics
Languages : en
Pages : 193
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Book Description
Summarizes the science of climate change and impacts on the United States, for the public and policymakers.
