noaa-icecore-17821 GISP2 Ice Core Thin Sections Alley, R.B.; Gow, A.J.; Meese, D.A.; Fitzpatrick, J.J.; Waddington, E.D.; Bolzan, J.F. GISP2 Ice Core Thin Sections 1997-11-30 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/17821 Investigator R.B. Alley Investigator A.J. Gow Investigator D.A. Meese Investigator J.J. Fitzpatrick Investigator E.D. Waddington Investigator J.F. Bolzan earth science paleoclimate ice cores inclination,bulk ice,null,degree,null,ice cores,null,null,N,ice crystal inclination earth science paleoclimate ice cores sample identification,null,null,null,null,ice cores,null,null,N,null earth science paleoclimate ice cores azimuth,bulk ice,null,degree,null,ice cores,null,null,N,ice crystal azimuth earth science paleoclimate ice core physical properties geoscientificInformation 110000 cal yr BP 36000 cal yr BP Complete 72.6 72.6 -38.5 -38.5 3200 3200 Continent North America Greenland GISP2>LATITUDE 72.6>LONGITUDE -38.5 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII R. B. Alley, A. J. Gow, D. A. Meese, J. J. Fitzpatrick, E. D. Waddington, J. F. Bolzan 1997 Journal of Geophysical Research: Oceans 102 C12 26819-26830 10.1029/96JC03836 http://onlinelibrary.wiley.com/enhanced/doi/10.1029/96JC03836/

Flow disturbances have been shown to alter stratigraphic order in the lower part of the ice sheet in central Greenland. Vertical thin sections of the Greenland Ice Sheet Project 2 ice core show that in the lower 30%, the expected c axis-vertical fabric is interrupted by planes of grains ("stripes") with c axes oriented approximately in the dip directions of the planes. Stripe-parallel shear produces small-scale folds. The stripes can be explained qualitatively by a simple nucleation-and-growth model based on the strong anisotropy of ice-crystal deformation. Nucleation probably is sensitive to spatially variable rates of polygonization, producing spatially variable stripe densities. Stripes are modeled to affect the ice viscosity, so variations in stripe density may contribute to viscosity contrasts that might produce larger deformational features and loss of stratigraphic order. STUDY NOTES: Vertical thin sections from the GISP2 core were examined on the Rigsby stage for c-axis orientation.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/gisp2/physical/thinsec.txt Data File; GISP2 Thin Sections USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11