scholarly journals Holocene accumulation and ice flow near the West Antarctic Ice Sheet Divide ice core site

2016 ◽  
Vol 121 (5) ◽  
pp. 907-924 ◽  
Author(s):  
Michelle R. Koutnik ◽  
T. J. Fudge ◽  
Howard Conway ◽  
Edwin D. Waddington ◽  
Thomas A. Neumann ◽  
...  
Keyword(s):  
Ice Core ◽  
Ice Sheet ◽  
The West ◽  
Ice Flow ◽  
Antarctic Ice Sheet ◽  
West Antarctic Ice Sheet ◽  
West Antarctic ◽  
Core Site

scholarly journals Atmospheric CO2over the last 1000 years: A high-resolution record from the West Antarctic Ice Sheet (WAIS) Divide ice core

2012 ◽  
Vol 26 (2) ◽  
pp. n/a-n/a ◽  
Author(s):  
Jinho Ahn ◽  
Edward J. Brook ◽  
Logan Mitchell ◽  
Julia Rosen ◽  
Joseph R. McConnell ◽  
...  
Keyword(s):  
High Resolution ◽  
Ice Core ◽  
Ice Sheet ◽  
The West ◽  
Antarctic Ice Sheet ◽  
West Antarctic Ice Sheet ◽  
West Antarctic

scholarly journals Formation of the West Antarctic Ice Sheet

1988 ◽  
Vol 11 ◽  
pp. 71-76 ◽  
Author(s):  
D. R. Lindstrom
Keyword(s):  
Ross Sea ◽  
Ice Sheet ◽  
Sediment Deposition ◽  
The West ◽  
Ice Flow ◽  
Antarctic Ice Sheet ◽  
West Antarctic Ice Sheet ◽  
West Antarctic ◽  
Bed Erosion ◽  
Ice Flows

A numerical ice-shelf model is employed to observe the inception of the West Antarctic ice sheet (WAIS) from a thin (20 m thick) floating ice cover under the following conditions: (i) a lower sea-level than at present, due to ice-sheet formation in the Northern Hemisphere, (ii) surface and basal temperature and accumulation rates approximately equal to those of present Antarctic ice shelves, and (iii) ice flow from East Antarctica into West Antarctica is neglected. The model determines the flow and thickness of floating ice and assumes that grounded ice is stagnant. Under these constraints, all regions except the Ross Sea, the Filchner region (east of Berkner Island), and up-stream of Thwaites Glacier ground within 4000 years. Ice readily grounds in the Ronne region (west of Berkner Island), forcing ice from Ellsworth Land to flow east toward the Filchner region. It is suggested that grounding over the Ross Sea, the Filchner region, and up-stream of Thwaites Glacier occurs only after grounded-ice flow is established. Grounded-ice flow is also a prerequisite of bed erosion and sediment deposition, which leave historical records of the actual ice-sheet formation. It is suggested that erosion and sediment deposition is minimal over the Ronne region and considerable along the path from Ellsworth Land to the Filchner region, because more ice flows toward the Filchner region than the Ronne region. It is probably difficult for ice to ground over the Ross region, so this region should have a high proportion of glacial marine sediments.

scholarly journals Formation of the West Antarctic Ice Sheet

1988 ◽  
Vol 11 ◽  
pp. 71-76
Author(s):  
D. R. Lindstrom
Keyword(s):  
Ross Sea ◽  
Ice Sheet ◽  
Sediment Deposition ◽  
The West ◽  
Ice Flow ◽  
Antarctic Ice Sheet ◽  
West Antarctic Ice Sheet ◽  
West Antarctic ◽  
Bed Erosion ◽  
Ice Flows

A numerical ice-shelf model is employed to observe the inception of the West Antarctic ice sheet (WAIS) from a thin (20 m thick) floating ice cover under the following conditions: (i) a lower sea-level than at present, due to ice-sheet formation in the Northern Hemisphere, (ii) surface and basal temperature and accumulation rates approximately equal to those of present Antarctic ice shelves, and (iii) ice flow from East Antarctica into West Antarctica is neglected. The model determines the flow and thickness of floating ice and assumes that grounded ice is stagnant. Under these constraints, all regions except the Ross Sea, the Filchner region (east of Berkner Island), and up-stream of Thwaites Glacier ground within 4000 years. Ice readily grounds in the Ronne region (west of Berkner Island), forcing ice from Ellsworth Land to flow east toward the Filchner region. It is suggested that grounding over the Ross Sea, the Filchner region, and up-stream of Thwaites Glacier occurs only after grounded-ice flow is established. Grounded-ice flow is also a prerequisite of bed erosion and sediment deposition, which leave historical records of the actual ice-sheet formation. It is suggested that erosion and sediment deposition is minimal over the Ronne region and considerable along the path from Ellsworth Land to the Filchner region, because more ice flows toward the Filchner region than the Ronne region. It is probably difficult for ice to ground over the Ross region, so this region should have a high proportion of glacial marine sediments.

scholarly journals Ionic content in an ice core from the West Antarctic Ice Sheet: 1882-2008 A.D.

2018 ◽  
Vol 48 (4) ◽  
pp. 853-865
Author(s):  
Isaías Ullmann Thoen ◽  
Jefferson Cardia Simões ◽  
Filipe Gaudie Ley Lindau ◽  
Sharon Buchanan Sneed
Keyword(s):  
Ice Core ◽  
Ice Sheet ◽  
The West ◽  
Antarctic Ice Sheet ◽  
West Antarctic Ice Sheet ◽  
Ionic Content ◽  
West Antarctic

scholarly journals Core handling and processing for the WAIS Divide ice-core project

2014 ◽  
Vol 55 (68) ◽  
pp. 15-26 ◽  
Author(s):  
Joseph M. Souney ◽  
Mark S. Twickler ◽  
Geoffrey M. Hargreaves ◽  
Brian M. Bencivengo ◽  
Matthew J. Kippenhan ◽  
...  
Keyword(s):  
Ice Core ◽  
Ice Sheet ◽  
The West ◽  
Antarctic Ice Sheet ◽  
West Antarctic Ice Sheet ◽  
West Antarctic ◽  
The Us ◽  
Core Project

AbstractOn 1 December 2011 the West Antarctic Ice Sheet (WAIS) Divide ice-core project reached its final depth of 3405 m. The WAIS Divide ice core is not only the longest US ice core to date, but is also the highest-quality deep ice core, including ice from the brittle ice zone, that the US has ever recovered. The methods used at WAIS Divide to handle and log the drilled ice, the procedures used to safely retrograde the ice back to the US National Ice Core Laboratory (NICL) and the methods used to process and sample the ice at the NICL are described and discussed.

scholarly journals Snow Accumulation Variability Over the West Antarctic Ice Sheet Since 1900: A Comparison of Ice Core Records With ERA‐20C Reanalysis

2017 ◽  
Vol 44 (22) ◽  
pp. 11,482-11,490 ◽  
Author(s):  
Yetang Wang ◽  
Elizabeth R. Thomas ◽  
Shugui Hou ◽  
Baojuan Huai ◽  
Shuangye Wu ◽  
...  
Keyword(s):  
Ice Core ◽  
Ice Sheet ◽  
Snow Accumulation ◽  
The West ◽  
Antarctic Ice Sheet ◽  
West Antarctic Ice Sheet ◽  
West Antarctic ◽  
Ice Core Records

WACSWAIN project: isotope and chemical ice core records from Skytrain Ice Rise, Antarctica

2021 ◽  
Author(s):  
Mackenzie Grieman ◽  
Helene Hoffmann ◽  
Jack Humby ◽  
Robert Mulvaney ◽  
Christoph Nehrbass-Ahles ◽  
...  
Keyword(s):  
Ice Core ◽  
Ice Sheet ◽  
Before Present ◽  
Last Interglacial ◽  
Ice Shelf ◽  
The West ◽  
Antarctic Ice Sheet ◽  
West Antarctic Ice Sheet ◽  
West Antarctic ◽  
Water Isotope

<p>The aim of the WArm Climate Stability of the West Antarctic ice sheet in the last INterglacial (WACSWAIN) project is to investigate the possible collapse of the West Antarctic Ice Sheet (WAIS) and its surrounding ice shelves during the Last Interglacial (~120,000 years ago).  As part of this project, a 651-meter ice core was drilled to bedrock at Skytrain Ice Rise in Antarctica during the 2018/2019 field season.  Ions and elements originating from marine sources along with water isotope content in this ice core can be used to infer changes in ice sheet and ice shelf extent.  The stable water isotope signal has the potential to capture both regional climate change and changes in the elevation of the drilling site through time.  Marine chemical content in the ice core could indicate variability in the proximity of the site to a marine environment.  Water isotopes and chemical impurities in the ice core were analysed continuously using cavity ring down spectroscopy and inductively coupled plasma mass spectrometry, respectively. As expected, δ<sup>18</sup>O and δD increase from the last glacial maximum to the Holocene.  δ<sup>18</sup>O and δD increase and sodium and magnesium levels decline from deglaciation into the early Holocene. δ<sup>18</sup>O and δD show an abrupt increase in the early Holocene at about 8,000 years before present.  Sea salt similarly increases 2-fold and becomes more variable about 1,000 years later (7,000 years before present).  These increases could indicate a retreat of the ice shelf to its current position.</p>

scholarly journals A flow cytometric method to measure prokaryotic records in ice cores: an example from the West Antarctic Ice Sheet Divide drilling site

2016 ◽  
Vol 62 (234) ◽  
pp. 655-673 ◽  
Author(s):  
PAMELA A. SANTIBÁÑEZ ◽  
JOSEPH R. McCONNELL ◽  
JOHN C. PRISCU
Keyword(s):  
Ice Core ◽  
Ice Sheet ◽  
Ice Cores ◽  
High Temporal Resolution ◽  
The West ◽  
Antarctic Ice Sheet ◽  
West Antarctic Ice Sheet ◽  
West Antarctic ◽  
Flow Cytometric Method ◽  
Microbial Responses

ABSTRACTMicroorganisms were the earliest inhabitants on our planet that occupy nearly every environment, and play a major role in biogeochemical cycles. Despite their global importance, there remains a paucity of data on microbial responses to long-term environmental and climatic changes. Microorganisms are known to be immured in glacial ice, but no high-resolution temporal records of their density exist, owing in large part to the lack of appropriate clean methodology that allows for rapid analysis of samples over depth. We describe a clean and time efficient method that can produce a high-temporal resolution record of prokaryotic density archived in ice cores. The method combines acquisition of discrete samples using a continuous ice-core melting system coupled with flow cytometry (FCM) of DNA-stained samples. Specifically, we evaluate the performance of the FCM measurement technique in terms of specificity, precision, accuracy and minimum detection limits. Examples from the West Antarctic Ice Sheet Divide ice core are included to show the efficacy of the method.

Grounding-line retreat of the West Antarctic Ice Sheet from inner Pine Island Bay

Geology ◽  
2012 ◽  
Vol 41 (1) ◽  
pp. 35-38 ◽  
Author(s):  
C.-D. Hillenbrand ◽  
G. Kuhn ◽  
J. A. Smith ◽  
K. Gohl ◽  
A. G. C. Graham ◽  
...  
Keyword(s):  
Ice Sheet ◽  
The West ◽  
Antarctic Ice Sheet ◽  
West Antarctic Ice Sheet ◽  
West Antarctic ◽  
Grounding Line

scholarly journals A Potential Disintegration of the West Antarctic Ice Sheet: Implications for Economic Analyses of Climate Policy

2016 ◽  
Vol 106 (5) ◽  
pp. 607-611 ◽  
Author(s):  
Delavane Diaz ◽  
Klaus Keller
Keyword(s):  
Climate Policy ◽  
Expert Knowledge ◽  
Ice Sheet ◽  
The West ◽  
Antarctic Ice Sheet ◽  
West Antarctic Ice Sheet ◽  
Threshold Response ◽  
West Antarctic ◽  
Climate Forcings ◽  
Economic Analyses

The Earth system may react in a nonlinear threshold response to climate forcings. Incorporating threshold responses into integrated assessment models (IAMs) used for climate policy analysis poses nontrivial challenges, for example due to methodological limitations and pervasive deep uncertainties. Here we explore a specific threshold response, a potential disintegration of the West Antarctic Ice Sheet (WAIS). We review the current scientific understanding of WAIS, identify methodological and conceptual issues, and demonstrate avenues to address some of them through a stochastic hazard IAM framework combining emulation, expert knowledge, and learning. We conclude with a discussion of challenges and research needs.

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