Gas records from the West Greenland ice margin covering the Last Glacial termination: a horizontal ice core

Affordable Access

Gas records from the West Greenland ice margin covering the Last Glacial termination: a horizontal ice core

Authors
Publisher
Pergamon
Keywords
  • All Rights Reserved
  • West Greenland
  • (C) 2005 Elsevier Ltd
  • Certain Sites Along Ice Sheet Margins Provide An Easily Accessible And Almost Unlimited Supply Of An
  • Measurements Of Gases In Trapped Air From Ice Outcropping At Pakitsoq
  • Demonstrate That Ancient Air Is Mostly Well Preserved
  • No Alterations In Delta O-18(Atm) And Delta N-15 Of N-2 Are Apparent
  • And Alterations In Methane Are Found In Only A Few Ice Sections
  • Using Measurements Of These Gases
  • We Have Unambiguously Identified A Stratigraphic Section Containing Ice From The End Of Last Glacial
  • Younger Dryas And Preboreal Intervals
  • Extensive Sections Of Ice From The Holocene And Most Ages Within The Last Glacial Period Are Probabl
  • Very Accurate Dating Has Been Possible In The Ice Section Containing The Younger Dryas-Preboreal Abr
  • The Ice At Pakitsoq Is Folded And Non-Uniformly Thinned
  • With Many Cross-Cutting Bands Of Bubble-Free Ice And Dust
  • The Cross-Cutting Features Are Associated With Anomalies In Both The Gas And The Ice Records
  • With Careful Sampling To Avoid These
  • The Ice At Pakitsoq Is Suitable For Recovery Of Large-Volume Samples Of The Ancient Atmosphere For A

Abstract

Gas records from the West Greenland ice margin covering the Last Glacial termination: a horizontal ice core - DTU Orbit (26/05/14) Gas records from the West Greenland ice margin covering the Last Glacial termination: a horizontal ice core - DTU Orbit (26/05/14) Gas records from the West Greenland ice margin covering the Last Glacial termination: a horizontal ice core Certain sites along ice sheet margins provide an easily accessible and almost unlimited supply of ancient ice at the surface. Measurements of gases in trapped air from ice outcropping at Pakitsoq, West Greenland, demonstrate that ancient air is mostly well preserved. No alterations in delta O-18(atm) and delta N-15 of N-2 are apparent, and alterations in methane are found in only a few ice sections. Using measurements of these gases, we have unambiguously identified a stratigraphic section containing ice from the end of last glacial period as well as Bolling-Allerod, Younger Dryas and Preboreal intervals. Extensive sections of ice from the Holocene and most ages within the last glacial period are probably also present. Very accurate dating has been possible in the ice section containing the Younger Dryas-Preboreal abrupt climate transition signal. The ice at Pakitsoq is folded and non-uniformly thinned, with many cross-cutting bands of bubble- free ice and dust. The cross-cutting features are associated with anomalies in both the gas and the ice records. With careful sampling to avoid these, the ice at Pakitsoq is suitable for recovery of large-volume samples of the ancient atmosphere for analysis of trace constituents such as (CH4)-C-14. (c) 2005 Elsevier Ltd. All rights reserved. General information State: Published Organisations: Electromagnetic Systems, Department of Electrical Engineering Authors: Petrenko, V. (Ekstern), Severinghaus, J. (Ekstern), Brook, E. (Ekstern), Reeh, N. (Intern), Schafer, H. (Ekstern) Pages: 865-875 Publication date: 2006 Main Research Area: Technical/natural sciences Publication information

There are no comments yet on this publication. Be the first to share your thoughts.