Temperature Index Modeling Of The Kahiltna Glacier
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Temperature Index Modeling Of The Kahiltna Glacier
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Author : Joanna C. Young
language : en
Publisher:
Release Date : 2014
Temperature Index Modeling Of The Kahiltna Glacier written by Joanna C. Young and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Glaciers categories.
Glaciers of Alaska, USA, and Northwestern Canada are shedding mass at one of the highest rates of any mountain glacier system, with significant impact at the global and local scales. Despite advances in satellite and airborne technologies, fully characterizing the temporal evolution of glacier mass change in individual watersheds remains a challenge. Temperature index modeling is an approach that can be used to expand on sparse ground observations, and that can help bridge the gap between regional and individual watershed estimates of the time series of glacier mass change. Here we present a study on temperature index modeling of glacier-wide mass balance for the large Kahiltna Glacier (502 km2, 270 to 6100 m in elevation) in the Central Alaska Range, using a combination of ground observations and past climate data products. We reproduce mass changes from 1991 to 2011, and assess model performance by comparing our results to several field and remote sensing datasets. First, we compare our results to a 20-year record of mass balance measurements at a National Park Service index site at the glacier's equilibrium line altitude. We find low correlation between index site measurements and modeled glacier-wide balances (R2 = 0.24), indicating that the index site may not be representative of the glacier-wide mass balance regime. We compare next to glacier-wide mass balances derived from airborne laser altimetry, to assess the model's long-term mass change estimates. We find disagreement between the mean annual balances for 1995 to 2010 (-0.95 ±0.49 m w.e. yr−1 from the model versus -0.69 +0.07/-0.08 m w.e. yr−1 from laser altimetry). To validate the laser altimetry methods, we then compare estimates from 1951 to 2011 from laser altimetry and digital elevation model differencing, finding close agreement (-0.48 +0.08/-0.09 m w.e. yr−1 and -0.41 ±0.26 m w.e. yr−1, respectively), and lending strength to the laser altimetry centerline extrapolation techniques. We also examine estimates derived from regionally-downscaled satellite gravimetry. While gravimetry likely underestimates long-term mass loss for this glacier (-0.36 ±0.13 m w.e. yr−1 for 2003 to 2010), it correlates well to individual modeled annual balances (R2 = 0.72) and to the time series of mass balance at an ablation stake location (R2 = 0.81). Given ongoing refinements to gravimetry downscaling and geodetic techniques, our results point to the potential for integrating multiple methods to obtain the most information on subannual and long-term mass changes at the basin scale for remote sites such as the Kahiltna Glacier.
Observation And Modelling Of Glacier Mass Balances In Patagonia And Svalbard
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Author : Marco Möller
language : en
Publisher:
Release Date : 2011
Observation And Modelling Of Glacier Mass Balances In Patagonia And Svalbard written by Marco Möller and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
Thermal Basin Modeling And Analysis Using The Time Temperature Index
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Author : Kansas Geological Survey
language : en
Publisher:
Release Date :
Thermal Basin Modeling And Analysis Using The Time Temperature Index written by Kansas Geological Survey and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on with categories.
A Temperature Index Model Of Stream Flow In Taylor Valley Antarctica
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Author : Amy Francis Ebnet
language : en
Publisher:
Release Date : 2006
A Temperature Index Model Of Stream Flow In Taylor Valley Antarctica written by Amy Francis Ebnet and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Glaciers categories.
Principles Of Glacier Mechanics
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Author : Roger LeB. Hooke
language : en
Publisher: Cambridge University Press
Release Date : 2019-12-05
Principles Of Glacier Mechanics written by Roger LeB. Hooke and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-12-05 with Business & Economics categories.
The principles of glacier physics are developed from basic laws in this up-to-date third edition for advanced students and researchers.
Government Reports Announcements Index
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Author :
language : en
Publisher:
Release Date : 1975
Government Reports Announcements Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975 with Government publications categories.
Sipre Report
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Author :
language : en
Publisher:
Release Date :
Sipre Report written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on with Frozen ground categories.
Islands Of The Seals
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Author : Bruce Molnia
language : en
Publisher:
Release Date : 1982
Islands Of The Seals written by Bruce Molnia and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with Glaciers categories.
Government Reports Announcements
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Author :
language : en
Publisher:
Release Date : 1975
Government Reports Announcements written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975 with Science categories.
Glacial Environments
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Author : M. J. Hambrey
language : en
Publisher: UBC Press
Release Date : 1994
Glacial Environments written by M. J. Hambrey and has been published by UBC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Science categories.
Enhanced by many photographic illustrations of extraordinaryquality, this textbook will provide students with a completeintroduction to the scientific study of environments dominated by snowand ice. Glacial environments are scenically and scientifically amongthe most exciting on Earth, and at the same time they are among themost complex. Apart from the processes associated directly with movingice, other processes -- fluvial, acolian, lacustrine, and marine --frequently interact with ice. Glacial environments therefore exhibit awide variety of landforms and sediment associations. Today, some ten per cent of the land surface of the Earth is coveredby ice, whereas in the Pleistocene the figure exceeded thirty per cent.In earlier geological history, the Earth underwent glaciations ofcontinent-wide extent on several occasions, some of them even moreintense than those of the Pleistocene. By examining the processesoperating within glacial settings and their resulting products,Glacial Environments provides the foundation for investigationof both the ancient and the modern record. Emphasizing the range of erosional and depositional landforms,drawing on the older geological record, according due attention to theexciting recent developments in research on the marine environment,incorporating illustrations from both contemporary and ancientenvironments and covering all relevant parts of the world, thisattractive book will find a wide readership among students ofgeography, geology and environmental science.