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Articles 1 - 18 of 18
Full-Text Articles in Physical Sciences and Mathematics
Changes In The Geometry And Volume Of Rabots Glaciär, Sweden, 2003-2011: Recent Accelerated Volume Loss Linked To More Negative Summer Balances, Keith A. Brugger, Latysha Pankratz
Changes In The Geometry And Volume Of Rabots Glaciär, Sweden, 2003-2011: Recent Accelerated Volume Loss Linked To More Negative Summer Balances, Keith A. Brugger, Latysha Pankratz
Geology Publications
Terminus geometry, ice margins, and surface elevations on Rabots glaciär were measured using differential GPS during summer 2011 and compared with those similarly measured in 2003. Glacier length over the eight years decreased by ∼105 m corresponding to 13 m a−1, a rate consistent with ice recession over the last several decades. Measured changes in surface elevations show that between 2003 and 2011 the glacier’s volume decreased by ∼27.6 ± 2.6 × 106 m3, or 3.5± 0.3 × 106 m3 a−1. This compares favorably with an estimate of −28.1 ± 2.6 × 106 m3 based on a mass-balance approach. The …
Instruments And Methods: A Method For Recording Ice Ablation Using A Low-Cost Ultrasonic Rangefinder, M. Len Keeler, Keith A. Brugger
Instruments And Methods: A Method For Recording Ice Ablation Using A Low-Cost Ultrasonic Rangefinder, M. Len Keeler, Keith A. Brugger
Geology Publications
We have adapted inexpensive ultrasonic rangefinders to measure ablation rates on the surface of a glacier.While ultrasonic rangers are commercially available for this purpose, our goal was to utilize rangefinders typically used in hobby robotics without significantly compromising performance. To correct for environmental factors that affect the speed of sound we use two ultrasonic rangefinders, one focused on a fixed target. Measurements of ablation correlate well with manual measurements with an uncertainty of about 3 cm, suggesting an accuracy comparable with other non-manual methods of recording ablation. The limitations of our rangefinder include those inherent in commercially available units as …
Cosmogenic 10be And 36cl Ages From Late Pleistocene Terminal Moraine Complexes In The Taylor River Drainage Basin, Central Colorado, U.S.A., Keith A. Brugger
Cosmogenic 10be And 36cl Ages From Late Pleistocene Terminal Moraine Complexes In The Taylor River Drainage Basin, Central Colorado, U.S.A., Keith A. Brugger
Geology Publications
Cosmogenic surface-exposure ages from boulders on a terminal moraine complex establish the timing of the local last glacial maximum (LGM) in the Taylor River drainage basin, central Colorado. Five zero-erosion 10Be ages have a mean of 19.5±1.8 ka while that for three 36Cl ages is 20.7±2.3 ka. Corrections for modest rates (∼1 mm ka−1) of boulder surface erosion result in individual and mean ages that are generally within 2% of their zero-erosion values. Both the means and the range in ages of individual boulders are consistent with those reported for late Pleistocene moraines elsewhere in the …
Minnesotans In Nature: Trends And Prospects, John R. Borchert
Minnesotans In Nature: Trends And Prospects, John R. Borchert
Journal of the Minnesota Academy of Science
No abstract provided.
Geology At The Secondary School Level, William C. Scott
Geology At The Secondary School Level, William C. Scott
Journal of the Minnesota Academy of Science
No abstract provided.
Structural Geology At Llallagua, Bolivia, Lowell Moon
Structural Geology At Llallagua, Bolivia, Lowell Moon
Journal of the Minnesota Academy of Science
No abstract provided.
Glacial Geology Work Of Prof. N. H. Winchell, F.W. Sardeson
Glacial Geology Work Of Prof. N. H. Winchell, F.W. Sardeson
Journal of the Minnesota Academy of Science
No abstract provided.
Contributions Of N. H. Winchell To The Geology Of The Iron Ranges Of Minnesota, W.H. Emmons
Contributions Of N. H. Winchell To The Geology Of The Iron Ranges Of Minnesota, W.H. Emmons
Journal of the Minnesota Academy of Science
No abstract provided.
The Iron Ore Ranges Of Minnesota, And Their Differences, N. H. Winchell
The Iron Ore Ranges Of Minnesota, And Their Differences, N. H. Winchell
Journal of the Minnesota Academy of Science
No abstract provided.
The Structure, Lithology And Genesis Of The Magnesian Series Of The Northwestern States, C. W. Hall
The Structure, Lithology And Genesis Of The Magnesian Series Of The Northwestern States, C. W. Hall
Journal of the Minnesota Academy of Science
No abstract provided.
The Geology Of The Artesian Basin In South Dakota, D. S. Mccaslin
The Geology Of The Artesian Basin In South Dakota, D. S. Mccaslin
Journal of the Minnesota Academy of Science
No abstract provided.
The Field Of Geology And Its Promise For The Future, W. J. Mcgee
The Field Of Geology And Its Promise For The Future, W. J. Mcgee
Journal of the Minnesota Academy of Science
No abstract provided.
On Some Tests Of Building Stones, J. A. Dodge
On Some Tests Of Building Stones, J. A. Dodge
Journal of the Minnesota Academy of Science
No abstract provided.
Report Of The Section Of Mineralogy, N. H. Winchell
Report Of The Section Of Mineralogy, N. H. Winchell
Journal of the Minnesota Academy of Science
No abstract provided.
Lake Agassiz: A Chapter In Glacial Geology, Warren Upham
Lake Agassiz: A Chapter In Glacial Geology, Warren Upham
Journal of the Minnesota Academy of Science
No abstract provided.
Geological Notes From Early Explorers In The Minnesota Valley, N. H. Winchell
Geological Notes From Early Explorers In The Minnesota Valley, N. H. Winchell
Journal of the Minnesota Academy of Science
No abstract provided.
Geological Notes From Early Explorers In The Minnesota Valley, N. H. Winchell
Geological Notes From Early Explorers In The Minnesota Valley, N. H. Winchell
Journal of the Minnesota Academy of Science
No abstract provided.
Geological And Archeological Evidences Of The Antiquity Of Man, A. E. Johnson
Geological And Archeological Evidences Of The Antiquity Of Man, A. E. Johnson
Journal of the Minnesota Academy of Science
No abstract provided.