Mcmurdo Ice Shelf

Total Page：16

File Type：pdf, Size：1020Kb

Neotectonic and Glacial History of the Southweste rn Ross Sea, Anta rct ica : Enhanced Interpretation from Integrated Seafloor Bathymetry and Terrestrial DEMs Terror rift map from Storti et al 2008 Terry Wilson, Jamey Stutz, William Magee, Christopher Gordon, and Stuart Henrys The Byrd Polar Research Center at The Ohio State University GNS Science, Lower Hutt, New Zealand Terror Rift 180 Western Ross Sea, Transantarctic Antarctica Mountains Multibeam Track lines East MGDS-Lamont Ant. Ross GeoMapApp Ice Sea Sheet McMurdo Ross Ice Shelf RVIB Nathaniel B. Palmer McMurdo Sound Ross Ice Shelf 7000 km multibeam / 2500 km seismic/ dredging Wilson, Lawver & Henrys, 2004 Seafloor Volcanic Volcanic hills field ftfeatures Franklin Island Beaufort Island Aeromagnetic anomaly map: Chiappini et al. 2002 Seafloor Hills N S N C.I. = 20m Conduits underlying the hills are fault controlled – following Terror Rift structure N IT90A-65 USGS-407 Drygalski ice tongue Seafloor Franklin hills D Island D D Cape Bird, Ross Island Franklin Island seafloor hills USGS-407 Cones - Franklin Volcanic Field 556 Ka 509 Ka 90 Ka Rilling et al., 2009 surface cones USGS 407 Regional Volcanic Trends seafloor Fraasnklin Is. hills ? Mt Terror Mt Bird Mt Erebus Beaufort Is. Ross Island Regional arrays of volcanic lineaments on seafloor McMurdo Sound Bird Ross Island Dry Valleys Erebus Terror Mt Erebus Mt Bird Flat-topped mounds Erebus-related volcanic fissures McMurdo Sound: grounded ice features – marggyins only! McMurdo Ice Shelf Mt Erebus Mt Bird LGM Ross Ice Sheet Dry reconstruction Valleys McMurdo Sound Ross Island Denton & Marchant 2000 Channel systems in McMurdo Sound McMurdo Ice Shelf Mt Erebus Mt Bird Ferrar Taylor MacKay Glacier Valley Glacier “Dry ”? Va lleys.. McMurdo Ice Shelf Mapping ice limits Terrestrial mapping Denton and Marchant, 2000 Ice volume calculations: modeling GPS -derived vertical motions from glacial isostatic adjustment DtDenton an d MhtMarchant, 2000 Grounded ice limit – seafloor mapping Host of geological targets in the Ross Sea More data !.

Copy Link

Recommended publications

Antarctica's Drygalski Ice Tongue
Antarctica’s Drygalski Ice Tongue 1988 2002 Tongue Growth, 1988–2002 The 20-kilometer wide floating slab, known as the Drygalski Ice Tongue, is being pushed into McMurdo Sound, fed by the David Glacier in East Antarctica. Although the sea eats away its ragged sides, the Tongue continues to grow, as shown in this image progression from 1988 (top) to 2002 (middle). Drygalski’s 10-kilometer growth over those 14 years is shown on the bottom picture (red line), and is one measure of how fast some of the Antarctic ice sheet is moving into the sea. www.nasa.gov Antarctica’s Drygalski Ice Tongue Goddard Space Flight Center A Giant Tongue of Ice To meet this critical need, data from over a thousand In these satellite images, the Drygalski Ice Tongue Landsat 7 satellite images like those featured here juts out from the icy land of Antarctica into McMurdo were joined into the most detailed, high-resolution Sound like a pier. Drygalski is a floating extension of natural-color map ever produced of Antarctica. The a land-based glacier. It is one of the largest floating Landsat Image Mosaic of Antarctica (LIMA) offers objects in the world, and contains ice that first fell views of the southernmost continent on Earth in ten as snow on the ice sheet thousands of years ago. times greater detail than previously possible. Some Change is the norm for all glaciers, even for a behemoth locations in LIMA have not even been mapped before! the size of Drygalski. Glacier creation begins when “This is like having a room aboard Landsat to see the more snow falls than melts, and gradually builds up whole ice sheet, yet being able to swoop down to over time.
[Show full text]
Open-File Report 2007-1047, Extended Abstracts
U.S. Geological Survey Open-File Report 2007-1047 Antarctica: A Keystone in a Changing World—Online Proceedings for the 10th International Symposium on Antarctic Earth Sciences Santa Barbara, California, U.S.A.—August 26 to September 1, 2007 Edited by Alan Cooper, Carol Raymond, and the 10th ISAES Editorial Team 2007 Extended Abstracts Extended Abstract 001 http://pubs.usgs.gov/of/2007/1047/ea/of2007-1047ea001.pdf Ross Aged Ductile Shearing in the Granitic Rocks of the Wilson Terrane, Deep Freeze Range area, north Victoria Land (Antarctica) by Federico Rossetti, Gianluca Vignaroli, Fabrizio Balsamo, and Thomas Theye Extended Abstract 002 http://pubs.usgs.gov/of/2007/1047/ea/of2007-1047ea002.pdf Postcollisional Magmatism of the Ross Orogeny (Victoria Land, Antarctica): a Granite- Lamprophyre Genetic Link S. Rocchi, G. Di Vincenzo, C. Ghezzo, and I. Nardini Extended Abstract 003 http://pubs.usgs.gov/of/2007/1047/ea/of2007-1047ea003.pdf Age of Boron- and Phosphorus-Rich Paragneisses and Associated Orthogneisses, Larsemann Hills: New Constraints from SHRIMP U-Pb Zircon Geochronology by C. J. Carson, E.S. Grew, S.D. Boger, C.M. Fanning and A.G. Christy Extended Abstract 004 http://pubs.usgs.gov/of/2007/1047/ea/of2007-1047ea004.pdf Terrane Correlation between Antarctica, Mozambique and Sri Lanka: Comparisons of Geochronology, Lithology, Structure And Metamorphism G.H. Grantham, P.H. Macey, B.A. Ingram, M.P. Roberts, R.A. Armstrong, T. Hokada, K. by Shiraishi, A. Bisnath, and V. Manhica Extended Abstract 005 http://pubs.usgs.gov/of/2007/1047/ea/of2007-1047ea005.pdf New Approaches and Progress in the Use of Polar Marine Diatoms in Reconstructing Sea Ice Distribution by A.
[Show full text]
The Influence of the Drygalski Ice Tongue on the Local Ocean
Annals of Glaciology 58(74) 2017 doi: 10.1017/aog.2017.4 51 © The Author(s) 2017. This is an Open Access article, distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike licence (http://creativecommons.org/licenses/by-nc-sa/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the same Creative Commons licence is included and the original work is properly cited. The written permission of Cambridge University Press must be obtained for commercial re-use. The influence of the Drygalski Ice Tongue on the local ocean Craig STEVENS,1,2 Won SANG LEE,3,4 Giannetta FUSCO,5 Sukyoung YUN,3 Brett GRANT,1 Natalie ROBINSON,1 Chung YEON HWANG3 1National Institute for Water and Atmospheric Research (NIWA), Greta Point, Wellington, New Zealand E-mail: [email protected] 2Department of Physics, University of Auckland, New Zealand 3Korea Polar Research Institute, Yeonsu-gu, Incheon 21990, Republic of Korea 4Korea University of Science and Technology, Daejeon 34113, Republic of Korea 5Parthenope University of Naples, Italy ABSTRACT. The Drygalski Ice Tongue presents an ∼80 km long floating obstacle to alongshore flows in the Victoria Land coastal ocean region of the Western Ross Sea. Here we use oceanographic data from near to the tongue to explore the interplay between the floating glacier and the local currents and strati- fication. A vessel-based circuit of the glacier, recording ocean temperature and salinity profiles, reveals the southwest corner to be the coldest and most complex in terms of vertical structure. The southwest corner structure beneath the surface warm, salty layer sustains a block of very cold water extending to 200 m depth.
[Show full text]
S41467-018-05625-3.Pdf
ARTICLE DOI: 10.1038/s41467-018-05625-3 OPEN Holocene reconfiguration and readvance of the East Antarctic Ice Sheet Sarah L. Greenwood 1, Lauren M. Simkins2,3, Anna Ruth W. Halberstadt 2,4, Lindsay O. Prothro2 & John B. Anderson2 How ice sheets respond to changes in their grounding line is important in understanding ice sheet vulnerability to climate and ocean changes. The interplay between regional grounding 1234567890():,; line change and potentially diverse ice flow behaviour of contributing catchments is relevant to an ice sheet’s stability and resilience to change. At the last glacial maximum, marine-based ice streams in the western Ross Sea were fed by numerous catchments draining the East Antarctic Ice Sheet. Here we present geomorphological and acoustic stratigraphic evidence of ice sheet reorganisation in the South Victoria Land (SVL) sector of the western Ross Sea. The opening of a grounding line embayment unzipped ice sheet sub-sectors, enabled an ice flow direction change and triggered enhanced flow from SVL outlet glaciers. These relatively small catchments behaved independently of regional grounding line retreat, instead driving an ice sheet readvance that delivered a significant volume of ice to the ocean and was sustained for centuries. 1 Department of Geological Sciences, Stockholm University, Stockholm 10691, Sweden. 2 Department of Earth, Environmental and Planetary Sciences, Rice University, Houston, TX 77005, USA. 3 Department of Environmental Sciences, University of Virginia, Charlottesville, VA 22904, USA. 4 Department
[Show full text]
Immediate Scientific Report of the Ross Sea Iceberg Project 1987-88
SCIENCE AND RESEARCH INTERNAL REPORT 9 IMMEDIATE SCIENTIFIC REPORT OF THE ROSS SEA ICEBERG PROJECT 1987-88 by J.R. Keys and A.D.W. Fowler* This is an unpublished report and must not be cited or reproduced in whole or part without permission from the Director, Science and Research. It should be cited as Science and Research Internal Report No.9 (unpublished). Science and Research Directorate, Department of Conservation, P.O. Box 10 420 Wellington, New Zealand April 1988 *Division of Information Technology, DSIR, Lower Hutt. 1 Frontispiece. NOAA 9 infrared satellite image of the 160 km long mega-giant iceberg B-9 on 9 November, four weeks after separating from the eastern front of Ross Ice Shelf. The image was digitized by US Navy scientists at McMurdo Station, paid for by the US National Science Foundation and supplied by the Antarctic Research Center at Scripps Institute. Several other bergs up to 20 km long that calved at the same time can be seen between B-9 and the ice shelf. These bergs have since drifted as far west as Ross Island (approx 600 km) whereas B-9 has moved only 215 km by 13 April, generally in a west-north-west direction. 2 CONTENTS Frontispiece 1 Contents page 2 SUMMARY 3 INTRODUCTION 4 PROPOSED PROGRAMME 5 ITINERARY 6 SCIENTIFIC ACHIEVEMENTS RNZAF C-130 iceberg monitoring flight 6 SPOT satellite image and concurrent aerial Photography 8 Ground-based fieldwork 9 B-9 iceberg 11 CONCLUSION 13 FUTURE RESEARCH 13 PUBLICATIONS 14 Acknowledgenents 14 References 14 FIGURES 15 TABLES 20 3 1.
[Show full text]
Local Climatology of Fast Ice in Mcmurdo Sound, Antarctica
Antarctic Science page 1 of 18 (2018) © Antarctic Science Ltd 2018 doi:10.1017/S0954102017000578 Local climatology of fast ice in McMurdo Sound, Antarctica STACY KIM1, BEN SAENZ2, JEFF SCANNIELLO3, KENDRA DALY4 and DAVID AINLEY5 1Moss Landing Marine Labs, 8272 Moss Landing Rd, Moss Landing, CA 95039, USA 2Resource Management Associates, 756 Picasso Ave G, Davis, CA 95618, USA 3United States Antarctic Program, 7400 S. Tucson Way, Centennial, CO 90112, USA 4University of South Florida - Saint Petersburg, 140 7th Ave S, MSL 220C, St Petersburg, FL 33701, USA 5HT Harvey and Associates, 983 University Ave, Los Gatos, CA 95032, USA [email protected] Abstract: Fast ice plays important physical and ecological roles: as a barrier to wind, waves and radiation, as both barrier and safe resting place for air-breathing animals, and as substrate for microbial communities. While sea ice has been monitored for decades using satellite imagery, high-resolution imagery sufficient to distinguish fast ice from mobile pack ice extends only back to c. 2000. Fast ice trends may differ from previously identified changes in regional sea ice distributions. To investigate effects of climate and human activities on fast ice dynamics in McMurdo Sound, Ross Sea, the sea and fast ice seasonal events (1978–2015), ice thicknesses and temperatures (1986–2014), wind velocities (1973–2015) and dates that an icebreaker annually opens a channel to McMurdo Station (1956–2015) are reported. A significant relationship exists between sea ice concentration and fast ice extent in the Sound. While fast/sea ice retreat dates have not changed, fast/sea ice reaches a minimum later and begins to advance earlier, in partial agreement with changes in Ross Sea regional pack ice dynamics.
[Show full text]
Changes Monitoring of the Drygalski Ice Tongue Front During 1973 to 2012
Geophysical Research Abstracts Vol. 16, EGU2014-270-2, 2014 EGU General Assembly 2014 © Author(s) 2014. CC Attribution 3.0 License. Changes monitoring of the Drygalski Ice Tongue front during 1973 to 2012 Chen Zhao (1,2), Xiao Cheng (1,2), Fengming Hui (1,2) (1) State Key Laboratory of Remote Sensing Science, Jointly Sponsored by Beijing Normal University and the Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100875, China ([email protected]), (2) College of Global Change and Earth System Science, Beijing Normal University, Beijing 100875, China([email protected]) Drygalski Ice Tongue is the largest outlet glacier in the Victoria Land part of the East Antarctic ice sheet with an area of 224,000 km2, and it is the seaward extension of David Glacier, located on the Scott Coast, in the northern part of McMurdo Sound of Antarctica’s Ross Dependency. The supply of the David Glacier-Drygalski Ice Tongue comes from two main ﬂows, a northern one from the Talos Dome and a southern one from Dome C. The importance of this glacier is due to the fact that it is the most massive drainage glacier in the Victoria Land part of East Antarctica sector. In addition, the ice tongue forms the southern coastline of Terra Nova Bay and the maximum eastward extent of the Terra Nova Bay polynya is limited by the length of the ice tongue. In this study, we extracted the boundaries of the Drygalski Ice Tongue front from 1973-2012 using a time series of ENVISAT ASAR and Landsat TM/ETM+ data.
[Show full text]
Observing the Antarctic Ice Sheet Using the Radarsat-1 Synthetic Aperture Radar1
OBSERVING THE ANTARCTIC ICE SHEET USING THE RADARSAT-1 SYNTHETIC APERTURE RADAR1 Kenneth C. Jezek Byrd Polar Research Center, The Ohio State University Columbus, Ohio 43210 Abstract: This paper discusses the RADARSAT-1 Antarctic Mapping Project (RAMP). RAMP is a collaboration between NASA and the Canadian Space Agency (CSA) to map Antarctica using the RADARSAT -1 synthetic aperture radar. The project was conducted in two parts. The first part, which had the data acquisition phase in 1997, resulted in the first high-resolution radar map of Antarctica. The second part, which occurred in 2000, remapped the continent below 80°S Latitude and is now using interfer- ometric repeat-pass observations to compute glacier surface velocities. Project goals and objectives are reviewed here along with several science highlights. These highlights include observations of ice sheet margin change using both RAMP and historical data sets and the derivation of surface velocities on an East Antarctic outlet glacier using interferometric data collected in 2000. INTRODUCTION Carried aloft by a NASA rocket launched from Vandenburg Air Force Base on November 4, 1995, the Canadian RADARSAT-1 is equipped with a C-band (5.3 GHz) synthetic aperture radar (SAR) capable of acquiring high-resolution (25 m) images of the Earth’s surface day or night and under all weather conditions. Along with the attributes familiar to researchers working with SAR data from the European Space Agency’s Earth Remote Sensing Satellite and ENVISAT as well as the Japa- nese Earth Resources Satellite, RADARSAT-1 has enhanced flexibility to collect data using a variety of swath widths, incidence angles, and resolutions.
[Show full text]
Background to the ANDRILL Mcmurdo Ice Shelf Project (Antarctica) and Initial Science Volume
University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln ANDRILL Research and Publications Antarctic Drilling Program 2007 Background to the ANDRILL McMurdo Ice Shelf Project (Antarctica) and Initial Science Volume T. R. Naish Victoria University of Wellington, [email protected] R. D. Powell Northern Illinois University, [email protected] R. H. Levy University of Nebraska–Lincoln, [email protected] ANDRILL-MIS Science Team Follow this and additional works at: https://digitalcommons.unl.edu/andrillrespub Part of the Environmental Indicators and Impact Assessment Commons Naish, T. R.; Powell, R. D.; Levy, R. H.; and ANDRILL-MIS Science Team, "Background to the ANDRILL McMurdo Ice Shelf Project (Antarctica) and Initial Science Volume" (2007). ANDRILL Research and Publications. 29. https://digitalcommons.unl.edu/andrillrespub/29 This Article is brought to you for free and open access by the Antarctic Drilling Program at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in ANDRILL Research and Publications by an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. Terra Antartica 2007, 14(3), 121-130 Background to the ANDRILL McMurdo Ice Shelf Project (Antarctica) and Initial Science Volume T. N AISH1,2*, R. POWELL3, R. LEVY4 & THE ANDRILL-MIS SCIENCE TEAM5 1Antarctic Research Centre, Victoria University of Wellington, PO Box 600, Wellington - New Zealand 2Geological and Nuclear (GNS) Science, PO Box 30368, Lower Hutt - New Zealand 3Department of Geology and Environmental Geosciences, Northern Illinois University, DeKalb, IL, 60115-2854 - USA 4ANDRILL Science Management Ofﬁ ce, University of Nebraska-Lincoln, Lincoln, NE 68588-0341 - USA 5 http://www.andrill.org/support/references/appendixc.html *Corresponding author ([email protected]) INTRODUCTION TO THE VOLUME (Horgan et al.
[Show full text]
Museum Exhibit Ideas for Virtual Antarctic Historic Hut Experience
Museum Exhibit Ideas for Virtual Antarctic Historic Hut Experience David Sickinger GCAS 2004/2005 Personal Project Introduction The aim of this report was to investigate museum exhibit ideas for a Virtual Antarctic historic hut experience. The author's one-line response to probably the most important question on the GCAS course application form is reproduced below: 2. Indicate !tow, 011 completion oftlte course, you intend to use the experience btfuture postgraduate research, education, community work or in your career. Since I work at HIT Lab NZ, perhaps we could see if we could put together some type of interactive exhibit to help educate people on Antarctica. With this background information in mind, the author was contacted by Nigel Watson from the Antarctic Heritage Trust (AHT) at the beginning of the GCAS course. He suggested a topic idea for the personal project dealing with virtually visualizing the historic huts. Nigel is interested in providing "virtual access to showcase the Antarctic historic huts and the Antarctic 'heroic-era' legacy" (Personal Communication, Watson, 2004). A GCAS 2001/2002 student conducted a literature review on the subject that did a nice job of reviewing what was currently available on Antarctica at the time, various technologies that are available, and suggestions on what could be done in the future to create a much better virtual hut experience (Hyde, 2002). The author of this report assumes familiarity with the terminology that was nicely explained in Peter Hyde's literature review and would suggest reading it prior to this report if unfamiliar with any terms mentioned. This report focused on what could be done in a museum setting and an attempt was made to provide some actual Antarctic related samples that could be used to pursue project funding.
[Show full text]
Screen Quality
258 Credit: Andrew Magor/UNEP/Topfoto 259 3.8 Tundra and Polar Regions f all the terrestrial biomes, tun- permanently frozen subsoil called per- Circle in the Southern Hemisphere (EEA dra is the coldest. Tundra comes mafrost. Because the topsoil is so shallow n.d.). Although similar in many ways, the Ofrom the Finnish word tunturia, and underlaid by permafrost, it becomes two polar regions differ in that the Arctic which means treeless plain (Pullen 1996). quickly saturated with water. Lakes, ponds, is a frozen ocean surrounded by land, There are two distinct types of tundra: the and bogs dot the surface of the Arctic tun- whereas the Antarctic is a frozen continent vast Arctic tundra and high-altitude alpine dra throughout the brief summer months, surrounded by ocean. tundra on mountains. providing moisture for plants and Most of the world’s fresh water is Arctic tundra is located in the Northern nesting and feeding habitats for huge locked up in polar ice caps. Large glaciers Hemisphere on lands encircling the North numbers of waterfowl and other and ice sheets cover Arctic islands and Pole and extending south to the conifer- animals (Pullen 1996). Greenland in the north and the conti- ous boreal forests of the taiga and covering Alpine tundra is found on mountains nent of Antarctica in the south. Where ice approximately 5.6 million km2 (2 million throughout the world, at high altitudes— sheets and glaciers meet the ocean, huge square miles) Wookey 2002). Arctic tundra above the tree line—where conditions are chunks of ice continually break off, in a is characterized by cold, desert-like condi- too cold and too dry for trees to grow.
[Show full text]
Coastal-Change and Glaciological Map of the Northern Ross Ice Shelf Area, Antarctica: 1962–2004
Prepared in cooperation with the Scott Polar Research Institute, University of Cambridge, United Kingdom Coastal-Change and Glaciological Map of the Northern Ross Ice Shelf Area, Antarctica: 1962–2004 By Jane G. Ferrigno, Kevin M. Foley, Charles Swithinbank, and Richard S. Williams, Jr. Pamphlet to accompany Geologic Investigations Series Map I–2600–H 2007 U.S. Department of the Interior U.S. Geological Survey U.S. Department of the Interior Dirk Kempthorne, Secretary U.S. Geological Survey Mark D. Myers, Director U.S. Geological Survey, Reston, Virginia: 2007 For product and ordering information: World Wide Web: http://www.usgs.gov/pubprod Telephone: 1-888-ASK-USGS For more information on the USGS--the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment: World Wide Web: http://www.usgs.gov Telephone: 1-888-ASK-USGS Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this report is in the public domain, permission must be secured from the individual copyright owners to reproduce any copyrighted materials contained within this report. Suggested citation: Ferrigno, J.G., Foley, K.M., Swithinbank, Charles, and Williams, R.S., Jr., 2007, Coastal-change and glaciological map of the northern Ross Ice Shelf area, Antarctica—1962–2004: U.S. Geological Survey Geologic Investigations Series Map I–2600–H, 1 map sheet, 11-p. text. ISBN 978-1-4113-0961-6 Printed on recycled paper iii Contents Introduction.....................................................................................................................................................1
[Show full text]