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The Cryosphere, 14, 1399–1408, 2020 https://doi.org/10.5194/tc-14-1399-2020 © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License. Getz Ice Shelf melt enhanced by freshwater discharge from beneath the West Antarctic Ice Sheet Wei Wei1, Donald D. Blankenship1, Jamin S. Greenbaum1, Noel Gourmelen2, Christine F. Dow3, Thomas G. Richter1, Chad A. Greene4, Duncan A. Young1, SangHoon Lee5, Tae-Wan Kim5, Won Sang Lee5, and Karen M. Assmann6,a 1Institute for Geophysics and Department of Geological Sciences, Jackson School of Geosciences, University of Texas at Austin, Austin, Texas, USA 2School of GeoSciences, University of Edinburgh, Edinburgh, UK 3Department of Geography and Environmental Management, University of Waterloo, Waterloo, Ontario, Canada 4Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA 5Korea Polar Research Institute, Incheon, South Korea 6Department of Earth Sciences, University of Gothenburg, Gothenburg, Sweden apresent address: Institute of Marine Research, Tromsø, Norway Correspondence: Wei Wei ([email protected]) Received: 18 July 2019 – Discussion started: 26 July 2019 Revised: 8 March 2020 – Accepted: 10 March 2020 – Published: 27 April 2020 Abstract. Antarctica’s Getz Ice Shelf has been rapidly thin- 1 Introduction ning in recent years, producing more meltwater than any other ice shelf in the world. The influx of fresh water is The Getz Ice Shelf (Getz herein) in West Antarctica is over known to substantially influence ocean circulation and bi- 500 km long and 30 to 100 km wide; it produces more fresh ological productivity, but relatively little is known about water than any other source in Antarctica (Rignot et al., 2013; the factors controlling basal melt rate or how basal melt is Jacobs et al., 2013), and in recent years its melt rate has spatially distributed beneath the ice shelf. -
Glacier Change Along West Antarctica's Marie Byrd Land Sector
Glacier change along West Antarctica’s Marie Byrd Land Sector and links to inter-decadal atmosphere-ocean variability Frazer D.W. Christie1, Robert G. Bingham1, Noel Gourmelen1, Eric J. Steig2, Rosie R. Bisset1, Hamish D. Pritchard3, Kate Snow1 and Simon F.B. Tett1 5 1School of GeoSciences, University of Edinburgh, Edinburgh, UK 2Department of Earth & Space Sciences, University of Washington, Seattle, USA 3British Antarctic Survey, Cambridge, UK Correspondence to: Frazer D.W. Christie ([email protected]) Abstract. Over the past 20 years satellite remote sensing has captured significant downwasting of glaciers that drain the West 10 Antarctic Ice Sheet into the ocean, particularly across the Amundsen Sea Sector. Along the neighbouring Marie Byrd Land Sector, situated west of Thwaites Glacier to Ross Ice Shelf, glaciological change has been only sparsely monitored. Here, we use optical satellite imagery to track grounding-line migration along the Marie Byrd Land Sector between 2003 and 2015, and compare observed changes with ICESat and CryoSat-2-derived surface elevation and thickness change records. During the observational period, 33% of the grounding line underwent retreat, with no significant advance recorded over the remainder 15 of the ~2200 km long coastline. The greatest retreat rates were observed along the 650-km-long Getz Ice Shelf, further west of which only minor retreat occurred. The relative glaciological stability west of Getz Ice Shelf can be attributed to a divergence of the Antarctic Circumpolar Current from the continental-shelf break at 135° W, coincident with a transition in the morphology of the continental shelf. Along Getz Ice Shelf, grounding-line retreat reduced by 68% during the CryoSat-2 era relative to earlier observations. -
A Submarine Wall Protecting the Amundsen Sea Intensifies Melting of Neighboring Ice Shelves Özgür Gürses1, Vanessa Kolatschek1, Qiang Wang1, Christian B
The Cryosphere Discuss., https://doi.org/10.5194/tc-2019-32 Manuscript under review for journal The Cryosphere Discussion started: 15 March 2019 c Author(s) 2019. CC BY 4.0 License. Brief communication: A submarine wall protecting the Amundsen Sea intensifies melting of neighboring ice shelves Özgür Gürses1, Vanessa Kolatschek1, Qiang Wang1, Christian B. Rodehacke1, 2 1Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, D-27570, Germany 5 2Danish Meteorological Institute, Copenhagen Ø, DK-2100, Denmark Correspondence to: Christian B. Rodehacke ([email protected]) Abstract Disintegration of ice shelves in the Amundsen Sea has the potential to cause sea level rise by inducing an acceleration of grounded ice streams. Moore et al (2018) proposed that using a submarine wall to block the penetration of warm water into 10 the ice shelf cavities could reduce this risk. We use a global sea ice-ocean model to show that a wall shielding the Amundsen Sea below 350 m depth successfully suppresses the inflow of warm water and reduces ice shelf melting. However, the warm water gets redirected towards neighboring ice shelves, which reduces the effectiveness of the wall. 1 Introduction One of the consequences of the warming in the Earth's climate system is sea level rise. Sea level rise will impact coastal 15 societies, and economic activities in these areas. Currently the main contributors to rising global mean sea level are a steric component driven by the thermal expansion of the warming ocean, the mass loss from the Greenland Ice Sheet, and the world-wide retreat of glaciers (Rietbroek et al., 2016). -
I!Ij 1)11 U.S
u... I C) C) co 1 USGS 0.. science for a changing world co :::2: Prepared in cooperation with the Scott Polar Research Institute, University of Cambridge, United Kingdom Coastal-change and glaciological map of the (I) ::E Bakutis Coast area, Antarctica: 1972-2002 ;::+' ::::r ::J c:r OJ ::J By Charles Swithinbank, RichardS. Williams, Jr. , Jane G. Ferrigno, OJ"" ::J 0.. Kevin M. Foley, and Christine E. Rosanova a :;:,..... CD ~ (I) I ("') a Geologic Investigations Series Map I- 2600- F (2d ed.) OJ ~ OJ '!; :;:, OJ ::J <0 co OJ ::J a_ <0 OJ n c; · a <0 n OJ 3 OJ "'C S, ..... :;:, CD a:r OJ ""a. (I) ("') a OJ .....(I) OJ <n OJ n OJ co .....,...... ~ C) .....,0 ~ b 0 C) b C) C) T....., Landsat Multispectral Scanner (MSS) image of Ma rtin and Bea r Peninsulas and Dotson Ice Shelf, Bakutis Coast, CT> C) An tarctica. Path 6, Row 11 3, acquired 30 December 1972. ? "T1 'N 0.. co 0.. 2003 ISBN 0-607-94827-2 U.S. Department of the Interior 0 Printed on rec ycl ed paper U.S. Geological Survey 9 11~ !1~~~,11~1!1! I!IJ 1)11 U.S. DEPARTMENT OF THE INTERIOR TO ACCOMPANY MAP I-2600-F (2d ed.) U.S. GEOLOGICAL SURVEY COASTAL-CHANGE AND GLACIOLOGICAL MAP OF THE BAKUTIS COAST AREA, ANTARCTICA: 1972-2002 . By Charles Swithinbank, 1 RichardS. Williams, Jr.,2 Jane G. Ferrigno,3 Kevin M. Foley, 3 and Christine E. Rosanova4 INTRODUCTION areas Landsat 7 Enhanced Thematic Mapper Plus (ETM+)), RADARSAT images, and other data where available, to compare Background changes over a 20- to 25- or 30-year time interval (or longer Changes in the area and volume of polar ice sheets are intri where data were available, as in the Antarctic Peninsula). -
Getz Ice Shelf Melt Enhanced by Freshwater Discharge from Beneath the West Antarctic Ice Sheet
Edinburgh Research Explorer Getz Ice Shelf melt enhanced by freshwater discharge from beneath the West Antarctic Ice Sheet Citation for published version: Wei, W, Blankenship, DD, Greenbaum, JS, Gourmelen, N, Dow, CF, Richter, TG, Greene, CA, Young, DA, Lee, S, Kim, T, Lee, WS & Assmann, KM 2020, 'Getz Ice Shelf melt enhanced by freshwater discharge from beneath the West Antarctic Ice Sheet', Cryosphere, vol. 14, no. 4, pp. 1399-1408. https://doi.org/10.5194/tc- 14-1399-2020 Digital Object Identifier (DOI): 10.5194/tc-14-1399-2020 Link: Link to publication record in Edinburgh Research Explorer Document Version: Publisher's PDF, also known as Version of record Published In: Cryosphere Publisher Rights Statement: © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License. General rights Copyright for the publications made accessible via the Edinburgh Research Explorer is retained by the author(s) and / or other copyright owners and it is a condition of accessing these publications that users recognise and abide by the legal requirements associated with these rights. Take down policy The University of Edinburgh has made every reasonable effort to ensure that Edinburgh Research Explorer content complies with UK legislation. If you believe that the public display of this file breaches copyright please contact [email protected] providing details, and we will remove access to the work immediately and investigate your claim. Download date: 10. Oct. 2021 The Cryosphere, 14, 1399–1408, 2020 https://doi.org/10.5194/tc-14-1399-2020 © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License. -
Glacier Change Along West Antarctica's
The Cryosphere, 12, 2461–2479, 2018 https://doi.org/10.5194/tc-12-2461-2018 © Author(s) 2018. This work is distributed under the Creative Commons Attribution 4.0 License. Glacier change along West Antarctica’s Marie Byrd Land Sector and links to inter-decadal atmosphere–ocean variability Frazer D. W. Christie1, Robert G. Bingham1, Noel Gourmelen1, Eric J. Steig2, Rosie R. Bisset1, Hamish D. Pritchard3, Kate Snow1, and Simon F. B. Tett1 1School of GeoSciences, University of Edinburgh, Edinburgh, EH8 9XP, UK 2Department of Earth & Space Sciences, University of Washington, Seattle, WA 98195-1310, USA 3NERC British Antarctic Survey, Cambridge, CB3 0ET, UK Correspondence: Robert Bingham ([email protected]) Received: 27 November 2017 – Discussion started: 29 January 2018 Revised: 29 June 2018 – Accepted: 3 July 2018 – Published: 26 July 2018 Abstract. Over the past 20 years satellite remote sensing tively, our findings underscore the importance of spatial and has captured significant downwasting of glaciers that drain inter-decadal variability in atmosphere and ocean interac- the West Antarctic Ice Sheet into the ocean, particularly tions in moderating glaciological change around Antarctica. across the Amundsen Sea Sector. Along the neighbouring Marie Byrd Land Sector, situated west of Thwaites Glacier to Ross Ice Shelf, glaciological change has been only sparsely 1 Introduction monitored. Here, we use optical satellite imagery to track grounding-line migration along the Marie Byrd Land Sec- Recent in situ and satellite remote sensing campaigns have tor between 2003 and 2015, and compare observed changes played an important role in constraining the relative roles of with ICESat and CryoSat-2-derived surface elevation and ice, ocean and atmosphere interactions responsible for con- thickness change records. -
In This Issue
October 1997 Volume XXXII—Number 2 In this issue... Interim head of the Office of Polar Programs appointed Highlights of the 1997–1998 research season Sea-ice conditions force Cape Roberts drill team to withdraw early Teachers at the Poles U.S. Antarctic Program news RADARSAT: Making a digital mosaic of Antarctica Science notebook: News from For the first time in 160 days, the sun begins to rise over McMurdo Station, Antarctica and beyond Antarctica, on 19 August 1997. Though austral spring is still a month away, the sun's return means resumption of flights to and from the base—and the end of Current Antarctic Literature high- isolation for the 154 Americans who spent the winter at the station. Within days lights of the sunrise, 60 new staff members as well as fresh food, newspapers, and mail were delivered to McMurdo. The rising sun also marks the beginning of a 1997–1998 austral summer field new field season on the southernmost continent. season begins early Glaciological delineation of the dynamic coastline of Antarctica The National Science Foundation (NSF) provides awards for research and edu- Antarctica and sea-level change cation in the sciences and engineering. The awardee is wholly responsible for the conduct of such research and preparation of the results for publication. The Foundation awards of funds for Foundation, therefore, does not assume responsibility for the research findings antarctic projects, 1 October or their interpretation. 1996 through 31 January 1997 The Foundation welcomes proposals from all qualified scientists and engi- neers and strongly encourages women, minorities, and persons with disabili- ties to compete fully in any of the research- and education-related programs described here. -
UC Irvine UC Irvine Previously Published Works
UC Irvine UC Irvine Previously Published Works Title Getz Ice Shelf melting response to changes in ocean forcing Permalink https://escholarship.org/uc/item/5dh788mw Journal Journal of Geophysical Research: Oceans, 118(9) ISSN 2169-9275 Authors Jacobs, S Giulivi, C Dutrieux, P et al. Publication Date 2013-09-01 DOI 10.1002/jgrc.20298 License https://creativecommons.org/licenses/by/4.0/ 4.0 Peer reviewed eScholarship.org Powered by the California Digital Library University of California JOURNAL OF GEOPHYSICAL RESEARCH: OCEANS, VOL. 118, 4152–4168, doi:10.1002/jgrc.20298, 2013 Getz Ice Shelf melting response to changes in ocean forcing S. Jacobs,1 C. Giulivi,1 P. Dutrieux,2 E. Rignot,3,4 F. Nitsche,1 and J. Mouginot3,4 Received 12 March 2013; revised 14 June 2013; accepted 29 June 2013; published 5 September 2013. [1] The large and complex Getz Ice Shelf extends along nearly half of the West Antarctic coastline in the Amundsen Sea and is exposed to a more variable ocean environment than most other Pacific sector ice shelves. Ocean temperature, salinity, and dissolved oxygen profiles acquired near its sub-ice cavity openings are used here to estimate seawater transports and meltwater fractions. More complete coverage during 2000 and 2007 brackets most of the variability observed from 1994 to 2011, and yearlong records near one ice front support the use of summer profiles to determine annual basal melt rates. We find area average rates of 1.1 and 4.1 m/yr, higher in 2007 when a larger volume of warmer deep water occupied the adjacent continental shelf, and the ocean circulation was stronger. -
US Geological Survey Scientific Activities in the Exploration of Antarctica: 1946–2006 Record of Personnel in Antarctica and Their Postal Cachets: US Navy (1946–48, 1954–60), International
Prepared in cooperation with United States Antarctic Program, National Science Foundation U.S. Geological Survey Scientific Activities in the Exploration of Antarctica: 1946–2006 Record of Personnel in Antarctica and their Postal Cachets: U.S. Navy (1946–48, 1954–60), International Geophysical Year (1957–58), and USGS (1960–2006) By Tony K. Meunier Richard S. Williams, Jr., and Jane G. Ferrigno, Editors Open-File Report 2006–1116 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 Although this report is in the public domain, permission must be secured from the individual copyright owners to reproduce any copyrighted material contained within this report. Cover: 2006 postal cachet commemorating sixty years of USGS scientific innovation in Antarctica (designed by Kenneth W. Murphy and Tony K. Meunier, art work by Kenneth W. Murphy). ii Table of Contents Introduction......................................................................................................................................................................1 Selected.References.........................................................................................................................................................2 -
Intermittent Reduction in Ocean Heat Transport Into the Getz Ice Shelf
RESEARCH LETTER Intermittent Reduction in Ocean Heat Transport Into the 10.1029/2021GL093599 Getz Ice Shelf Cavity During Strong Wind Events Key Points: Nadine Steiger1,2 , Elin Darelius1,2 , Anna K. Wåhlin3 , and Karen M. Assmann4 • Observations at the western Getz Ice Shelf show eight intermittent events 1Geophysical Institute, University of Bergen, Bergen, Norway, 2Bjerknes Center for Climate Research, Bergen, Norway, of Winter Water deepening below 3Department of Marine Sciences, University of Gothenburg, Gothenburg, Sweden, 4Institute of Marine Research, 350 m depth during winter 2016 • The events are associated with Tromsø, Norway strong easterly winds and caused by non-local Ekman downwelling • The ocean heat transport into the Abstract The flow of warm water toward the western Getz Ice Shelf along the Siple Trough, West Getz Ice Shelf cavity is reduced by Antarctica, is intermittently disrupted during short events of Winter Water deepening. Here we show, 25% in the winter of 2016 due to the events using mooring records, that these 5–10 days-long events reduced the heat transport toward the ice shelf cavity by 25% in the winter of 2016. The events coincide with strong easterly winds and polynya opening in the region, but the Winter Water deepening is controlled by non-local coastal Ekman downwelling Supporting Information: Supporting Information may be found rather than polynya-related surface fluxes. The thermocline depth anomalies are forced by Ekman in the online version of this article. downwelling at the northern coast of Siple Island and propagate to the ice front as a coastal trapped wave. During the events, the flow at depth does no longer continue along isobaths into the ice shelf cavity but Correspondence to: aligns with the ice front. -
United States Antarctic Activities 2002-2003
United States Antarctic Activities 2002-2003 This site fulfills the annual obligation of the United States of America as an Antarctic Treaty signatory to report its activities taking place in Antarctica. This portion details planned activities for July 2002 through June 2003. Modifications to these plans will be published elsewhere on this site upon conclusion of the 2002-2003 season. National Science Foundation Arlington, Virginia 22230 November 30, 2002 Information Exchange Under United States Antarctic Activities Articles III and VII(5) of the ANTARCTIC TREATY Introduction Organization and content of this site respond to articles III(1) and VII(5) of the Antarctic Treaty. Format is as prescribed in the Annex to Antarctic Treaty Recommendation VIII-6, as amended by Recommendation XIII-3. The National Science Foundation, an agency of the U.S. Government, manages and funds the United States Antarctic Program. This program comprises almost the totality of publicly supported U.S. antarctic activities—performed mainly by scientists (often in collaboration with scientists from other Antarctic Treaty nations) based at U.S. universities and other Federal agencies; operations performed by firms under contract to the Foundation; and military logistics by units of the Department of Defense. Activities such as tourism sponsored by private U.S. groups or individuals are included. In the past, some private U.S. groups have arranged their activities with groups in another Treaty nation; to the extent that these activities are known to NSF, they are included. Visits to U.S. Antarctic stations by non-governmental groups are described in Section XVI. This document is intended primarily for use as a Web-based file, but can be printed using the PDF option. -
Constitution of the Grand Duchy of Flandrensis
Constitution of the Grand Duchy of Flandrensis “The only country in the world that doesn't want its land inhabited by people” 1. THE GRAND DUCHY OF FLANDRENSIS: STATE STRUCTURE AND TERRITORY 4 State Structure ............................................................................................................................... 4 Territory ............................................................................................................................................ 4 2. ENVIRONMENT ............................................................................................................................. 4 Our mission ..................................................................................................................................... 4 Nature in Antarctica ..................................................................................................................... 4 3. FOREIGN POLICY OF FLANDRENSIS ................................................................................... 5 Diplomatic relations (micronation) .......................................................................................... 5 Diplomatic Relations regarding macronations ..................................................................... 7 4. THE FLANDRENSIAN PEOPLE ................................................................................................ 7 The Flandrensians and their rights ......................................................................................... 7 Application for citizenship