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Mean and median grain area and grain perimeter from 7 depths of Siple Dome (SDMA) between 640 m and 790 m.

Federal Geographic Data Committee (FGDC) Metadata:

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Data_Quality_Information
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Distribution_Information
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Identification_Information:

Citation:

Citation_Information:

Originator: Rachel Obbard

Publication_Date: September 21, 2012

Title: Mean and median grain area and grain perimeter from 7 depths of Siple Dome (SDMA) between 640 m and 790 m.

Edition: 1.0

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Publication_Place: 14 Engineering Drive Hanover, NH. 03755 USA
Publisher: Thayer School, Dartmouth College

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Citation:

Citation_Information:

Originator: Rachel Obbard

Publication_Date: September 21, 2012

Title: Grain size and approximate age for 14 samples from Upper Fremont Glacier, WY

Edition: 1.0

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Publication_Place: 14 Engineering Drive Hanover, NH. 03755 USA
Publisher: Thayer School, Dartmouth College

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Citation:

Citation_Information:

Originator: Rachel Obbard

Publication_Date: September 21, 2012

Title: Structure Log for Upper Fremont Glacier, WY

Edition: 1.0

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Publication_Information:

Publication_Place: 14 Engineering Drive Hanover, NH. 03755 USA
Publisher: Thayer School, Dartmouth College

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Online_Linkage:

Citation:

Citation_Information:

Originator: Rachel Obbard

Publication_Date: September 21, 2012

Title: a{0001} and c{11-20} axis pole figures for 9 depths of the Upper Fremont Glacier, WY (core 98-4).

Edition: 1.0

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Publication_Place: 14 Engineering Drive Hanover, NH. 03755 USA
Publisher: Thayer School, Dartmouth College

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Online_Linkage:

Citation:

Citation_Information:

Originator: Rachel Obbard

Publication_Date: September 21, 2012

Title: a{0001} and c{11-20} axis pole figures for 5 depths of the Siple Dome (SDMA) core between 640m and 790m and misorientation angle distribution for the same grains.

Edition: 1.0

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Series_Information:

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Publication_Information:

Publication_Place: 14 Engineering Drive Hanover, NH. 03755 USA
Publisher: Thayer School, Dartmouth College

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Online_Linkage:

Citation:

Citation_Information:

Originator: Rachel Obbard

Publication_Date: September 21, 2012

Title: Pore size and distribution in 55 firn samples from Siple Dome (SDMA), Antarctica

Edition: 1.0

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Publication_Information:

Publication_Place: 14 Engineering Drive Hanover, NH. 03755 USA
Publisher: Thayer School, Dartmouth College

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Online_Linkage:

Description:

Abstract:: This award supports a project to use advanced microscopic and spectroscopic techniques to explore critical questions about microstructure in ice cores, in particular the microstructural locations of impurities, complete grain orientations, and microstructures associated with specific stress regimes or imposed strain. This work complements the visual stratigraphy, electrical conductivity measurement, and precise, detailed measurements of the soluble ion and gas contents that are performed by other researchers. Visual stratigraphy, ECM, ion chromatography and stable isotope analysis of ice cores contribute immensely to our understanding of paleoclimate and, to our ability to predict future climate change. We use primarily scanning electron microscope techniques – imaging, energy dispersive spectroscopy, and electron backscatter diffraction – and micro computed X-ray tomography to provide specific information on the microstructural location of impurities, the effect of impurities on physical properties of ice, the effects of stress and strain on microstructure, c- and a-axis fabric at selected depths, and the densification of snow and firn. This information will allow paleoclimatologists to better interpret ice core data and other scientists to understand and model the physical and mechanical properties of natural ice sheets.
Purpose:: Not Available
Supplemental_Information:: REFERENCE: Li, X; Iliescu, D; Baker, I. "On the effects of temperature on the strength of H2SO4-doped ice single crystals," JOURNAL OF GLACIOLOGY, v.55, 2009, p. 481-484. View record at Web of Science Obbard, RW; Troderman, G; Baker, I. "Imaging brine and air inclusions in sea ice using micro-X-ray computed tomography," JOURNAL OF GLACIOLOGY, v.55, 2009, p. 1113-1115. View record at Web of Science R.W. Obbard, I. Baker, D. Prior. "A scanning electron microscope technique for identifying the mineralogy of dust in ice cores," Journal of Glaciology, v.57, 2011, p. 511. Rasband, W.S. 2006. ImageJ program. Bethesda, MA, National Institutes of Health. Retzlaff, R. and C.R. Bentley. R.W. Obbard, K.E. Sieg, I. Baker, D. Meese (2011a) Microstructural evolution in the fine-grained region of the Siple Dome ice core. Journal of Glaciology, 57(206):1046-1056. R.W. Obbard, T. Cassano, K. Aho, G. Troderman, I. Baker (2011b) Using borehole logging to orient an ice core from the Upper Fremont Glacier, Wyoming. Journal of Glaciology, 57(205):0840-846. Olsen, L.M., G. Major, K. Shein, J. Scialdone, R. Vogel, S. Leicester, H. Weir, S. Ritz, T. Stevens, M. Meaux, C.Solomon, R. Bilodeau, M. Holland, T. Northcutt, R. A. Restrepo, 2007 . Morin, R.H., G.E. Descamps and L.D. Cecil. 2000. Characterizing englacial structure from analysis of acoustic televiewer logs,Upper Fremont Glacier, Wyoming. In Proceedings of the Seventh Logging, 24–26 October 2000, Golden, Colorado. Houston, TX,International Symposium on Mineral and GeoTechnical Society of Petrophysicists & Well Log Analysts. Minerals and Geotechnical Logging Society, 235–243. Lomonaco, R.; Albert, M.; Baker, I. (2011) Microstructural evolution of fine-grained layers through the firn column at Summit, Greenland. Journal of Glaciology 57(204): 755-762

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Beginning_Date: 20090901
Ending_Date: 20110301