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Flow of the Amery Ice Shelf and Its Tributary Glaciers
18th Australasian Fluid Mechanics Conference Launceston, Australia 3-7 December 2012 Flow of the Amery Ice Shelf and its Tributary Glaciers M. L. Pittard1 2 , J. L. Roberts3 2, R. C. Warner3 2, B.K Galton-Fenzi2, C.S. Watson4 and R. Coleman1 1Institute for Marine and Antarctic Studies University of Tasmania, Private Bag 129, Hobart, Tasmania 7001, Australia 2Antarctic Climate & Ecosystems Cooperative Research Centre University of Tasmania, Private Bag 80, Hobart, Tasmania 7001, Australia 3Department of Sustainability, Environment, Water, Population and Communities, Australian Antarctic Division Hobart, Tasmania, Australia 4 School of Geography and Environmental Studies University of Tasmania, Private Bag 76, Hobart, Tasmania 7001, Australia Abstract thickness across the grounding zone to provide information on ice discharge. Strain rates and vorticity can be used to investi- The Amery Ice Shelf (AIS) is a major ice shelf that drains ap- gate the dynamics of the flow. The longitudinal strain rate gives proximately 16% of the East Antarctic Ice Sheet [1]. Here we insight into the way the velocity changes along the flow and use a sequence of visible spectrum Landsat7 satellite images may reflect influences of features beneath the ice. The shear to track persistent surface features over the southern portion of component of the strain rate highlights the localisation of shear the AIS and its three major tributary glaciers. A spatially in- stresses at the margin of the flow. Vorticity displays a combina- complete velocity field is calculated by comparing the distances tion of rotation in flow direction and strong shear deformations. features have moved between image pairs. Key features of the flow field including the vorticity and strain rate distributions are The AIS is one of the largest ice shelves bordering the East discussed. -
Glaciomarine Sedimentation at the Continental Margin of Prydz Bay, East Antarctica: Implications on Palaeoenvironmental Changes During the Quaternary
Alfred-Wegener-Institut für Polar- und Meeresforschung Universität Potsdam, Institut für Erd- und Umweltwissenschaften Glaciomarine sedimentation at the continental margin of Prydz Bay, East Antarctica: implications on palaeoenvironmental changes during the Quaternary Dissertation zur Erlangung des akademischen Grades Doktor der Naturwissenschaften (Dr. rer. nat.) in der Wissenschaftsdisziplin “Geowissenschaften” eingereicht an der Mathematisch-Naturwissenschaftlichen Fakultät der Universität Potsdam von Andreas Borchers Potsdam, 30. November 2010 Das Höchste, wozu der Mensch gelangen kann, ist das Erstaunen. J. W. von Goethe Acknowledgements This dissertation would not have been possible without the support and help of numerous people to whom I would like to express my gratitude. First, I am highly indebted to PD Dr. Bernhard Diekmann for the possibility to conduct this work under his supervision and for his constant support, whenever discussion or advice was needed. I appreciated his vast expertise and knowledge of marine geology, sedimentology and Quaternary Science that he so enthusiastically shared with me, adding considerably to my experience. Besides being a full-hearted geologist, he is also a great guitarist, which I enjoyed during the past years, especially during the expeditions I had the chance to participate. I would also like to thank Prof. Dr. Hans-Wolfgang Hubberten for his general support and understanding, giving me the opportunity to broaden my knowledge of marine geology in the field. Using the infrastructure of the institute in Potsdam, Bremerhaven and on the world’s oceans has made a major contribution realizing this work. I am deeply grateful to Prof. Dr. Ulrike Herzschuh and Dr. Gerhard Kuhn who provided a large part of assistance by discussions, constructive advices and moral support. -
Investigation of Glacial Dynamics in Lambert Glacial Basin
INVESTIGATION OF GLACIAL DYNAMICS IN LAMBERT GLACIAL BASIN USING SATELLITE REMOTE SENSING TECHNIQUES A Dissertation by JAEHYUNG YU Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY December 2005 Major Subject: Geography INVESTIGATION OF GLACIAL DYNAMICS IN LAMBERT GLACIAL BASIN USING SATELLITE REMOTE SENSING TECHNIQUES A Dissertation by JAEHYUNG YU Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY Approved by: Chair of Committee, Hongxing Liu Committee Members, Andrew G. Klein Vatche P. Tchakerian Mahlon Kennicutt Head of Department, Douglas Sherman December 2005 Major Subject: Geography iii ABSTRACT Investigation of Glacial Dynamics in Lambert Glacial Basin Using Satellite Remote Sensing Techniques. Jaehyung Yu, B.S., Chungnam National University; M.S., Chungnam National University Chair of Advisory Committee: Dr. Hongxing Liu The Antarctic ice sheet mass budget is a very important factor for global sea level. An understanding of the glacial dynamics of the Antarctic ice sheet are essential for mass budget estimation. Utilizing a surface velocity field derived from Radarsat three-pass SAR interferometry, this study has investigated the strain rate, grounding line, balance velocity, and the mass balance of the entire Lambert Glacier – Amery Ice Shelf system, East Antarctica. The surface velocity increases abruptly from 350 m/year to 800 m/year at the main grounding line. It decreases as the main ice stream is floating, and increases to 1200 to 1500 m/year in the ice shelf front. -
Mapping Velocity of the Potsdam Glacier, East Antarctica Using Landsat-8 Data
The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XLII-2/W13, 2019 ISPRS Geospatial Week 2019, 10–14 June 2019, Enschede, The Netherlands MAPPING VELOCITY OF THE POTSDAM GLACIER, EAST ANTARCTICA USING LANDSAT-8 DATA S. D. Jawak1, M. Joshi2,3,*, A. J. Luis4, P. H. Pandit5, S. Kumar6, S. F. Wankhede4, Anirudh T. Somadas7 1Svalbard Integrated Arctic Earth Observing System (SIOS), SIOS Knowledge Centre, University Centre in Svalbard (UNIS), P.O. Box 156, N-9171, Longyearbyen, Svalbard, Norway; [email protected] 2Department of Geoinformatics, Mangalore University, Mangalore, Karnataka─574199, India 3Divecha Centre for Climate Change, Indian Institute of Science, Bangalore, Karnataka – 560012; [email protected] 4Earth System Science Organization - National Centre for Polar and Ocean Research, Ministry of Earth Sciences, Government of India, Headland Sada, Vasco-da -Gama, Goa 403804, India; [email protected], [email protected] 5National Bureau of Soil Survey and Land Use planning (NBSS & LUP) - Indian Agriculture Research Institute (IARI), New Delhi, India; [email protected] 6Centre for Land Resource Management, Central University of Jharkhand, Ranchi – 835205, India; [email protected] 7University of Twente, Faculty ITC, P. O. Box 217, 7500 AE Enschede, Netherlands; [email protected] KEY WORDS: Glacier velocity, image matching, pixel tracking, Landsat-8 OLI, Antarctic glacier ABSTRACT: Most of the glaciers have been retreating and thinning globally due to climate change. Glacier velocity is one such important parameter of glacier dynamics, which helps to understand the mass balance. The variations in velocity at different areas of the glacier can be used to identify the zones of ablation and accumulation. -
Coastal Change and Glaciological Map of The
Prepared in cooperation with the Scott Polar Research Institute, University of Cambridge, United Kingdom Coastal-Change and Glaciological Map of the Amery Ice Shelf Area, Antarctica: 1961–2004 By Kevin M. Foley, Jane G. Ferrigno, Charles Swithinbank, Richard S. Williams, Jr., and Audrey L. Orndorff Pamphlet to accompany Geologic Investigations Series Map I–2600–Q 2013 U.S. Department of the Interior U.S. Geological Survey U.S. Department of the Interior KEN SALAZAR, Secretary U.S. Geological Survey Suzette M. Kimball, Acting Director U.S. Geological Survey, Reston, Virginia: 2013 For more information on the USGS—the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment, visit http://www.usgs.gov or call 1–888–ASK–USGS. For an overview of USGS information products, including maps, imagery, and publications, visit http://www.usgs.gov/pubprod To order this and other USGS information products, visit http://store.usgs.gov Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this information product, for the most part, is in the public domain, it also may contain copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner. Suggested citation: Foley, K.M., Ferrigno, J.G., Swithinbank, Charles, Williams, R.S., Jr., and Orndorff, A.L., 2013, Coastal-change and glaciological map of the Amery Ice Shelf area, Antarctica: 1961–2004: U.S. Geological Survey Geologic Investigations Series Map I–2600–Q, 1 map sheet, 8-p. -
5. Structure and Dynamics of the Lambert Glacier-Amery Ice Shelf System: Implications for the Origin of Prydz Bay Sediments1
Barron, J., Larsen, B., et al., 1991 Proceedings of the Ocean Drilling Program, Scientific Results, Vol. 119 5. STRUCTURE AND DYNAMICS OF THE LAMBERT GLACIER-AMERY ICE SHELF SYSTEM: IMPLICATIONS FOR THE ORIGIN OF PRYDZ BAY SEDIMENTS1 Michael J. Hambrey2 ABSTRACT Depositional processes in Prydz Bay during the past 40 m.y. or so have been strongly influenced by glacier ice. Therefore, to understand these processes better, and to define the source areas of the sediment, it is necessary to deter- mine the role of the different ice masses entering the bay. Ice thickness, topography, and ice velocity data indicate that the Lambert Glacier-Amery Ice Shelf system is one of the most important routes for the discharge of ice from the East Antarctic Ice Sheet, and in the past has been the dominant influence on sedimentation in Prydz Bay. Most of the flow is concentrated through the Lambert Graben, which has been overdeepened to a depth of 2500 m below sea level. Glacio- logical work has indicated that close to the grounding line there is considerable melting, but from a short distance sea- ward of this position, basal freeze-on of ice of oceanic origin occurs. Thus nearly all the basal debris load in the Lam- bert Glacier system may be deposited close to the grounding line, and that there is probably negligible deposition be- neath the major part of the Amery Ice Shelf. Englacial debris, delivered to the open sea through the interior of the ice shelf, will be deposited from icebergs. There have been conflicting reports concerning the dynamics of the Lambert Glacier-Amery Ice Shelf system. -
Mass Budgets of the Lambert, Mellor and Fisher Glaciers and Basal Fluxes Beneath Their Flowbands on Amery Ice Shelf Jiahong Wen 1, 2 , Kenneth C
Mass budgets of the Lambert, Mellor and Fisher glaciers and basal fluxes beneath their flowbands on Amery Ice Shelf Jiahong Wen 1, 2 , Kenneth C. Jezek 2, Helen A. Fricker 3, Beata M. Csatho 2, Ute C. Herzfeld 4, Katy L. Farness 2, Philippe Huybrechts 5, 6 1Department of Geography, Shanghai Normal University, Shanghai 200234, China 2Byrd Polar Research Center, The Ohio State University, Columbus, OH 43210, USA 3IGPP, Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA 92093-0225, USA 4 CIRES/NSIDC, University of Colorado Boulder, Boulder, CO 80309-0449, USA 5Departement Geografie, Vrije Universiteit Brussel, Pleinlaan 2, B-1050, Brussels, Belgium 6Alfred-Wegener-Institut f ür Polar- und Meeresforschung, Postfach 120161, D-27515 Bremerhaven Abstract. We use in situ measurements and remote-sensing data sets to evaluate the mass budgets of the Lambert, Mellor and Fisher glaciers and the basal melting and freezing beneath their flowbands on the Amery Ice Shelf. Lambert and Mellor glaciers upstream the ANARE LGB traverse have positive imbalances of 3.9±2.1 Gt a -1 and 2.1±2.4 Gt a -1 respectively while the Fisher Glacier is approximately in balance. The upstream region as a whole has a positive imbalance of 5.9±4.9 Gt a -1. The three glaciers downstream the traverse line are in negative imbalance, and the whole downstream region has a negative imbalance of -8.5±5.8 Gt a -1. The mass budgets of the Lambert, Mellor, and Fisher glaciers are close to balance. The whole drainage basin of the three glaciers is also approximately in balance with a mass budget of -2.6±6.5 Gt a -1. -
CRREL Report 93-14
CRREL REPORT 93-14 Malcolm Mellor Aviation Notes onAntarctic August1993 Abstract Antarctic aviation has been evolving for the best part of a century, with regular air operations developing over the past three or four decades. Antarctica is the last continent where aviation still depends almost entirely on expeditionary airfields and “bush flying,” but change seems imminent. This report describes the history of aviation in Antarctica, the types and characteristics of existing and proposed airfield facilities, and the characteristics of aircraft suitable for Antarctic use. It now seems possible for Antarctic aviation to become an extension of mainstream international aviation. The basic requirement is a well-distributed network of hard-surface airfields that can be used safely by conventional aircraft, together with good international collaboration. The technical capabilities al- ready exist. Cover: Douglas R4D Que Sera Sera, which made the first South Pole landing on 31 October 1956. (Smithsonian Institution photo no. 40071.) The contents of this report are not to be used for advertising or commercial purposes. Citation of brand names does not constitute an official endorsement or approval of the use of such commercial products. For conversion of SI metric units to U.S./British customary units of measurement consult ASTM Standard E380-89a, Standard Practice for Use of the International System of Units, published by the American Society for Testing and Materials, 1916 Race St., Philadelphia, Pa. 19103. CRREL Report 93-14 US Army Corps of Engineers Cold Regions Research & Engineering Laboratory Notes on Antarctic Aviation Malcolm Mellor August 1993 Approved for public release; distribution is unlimited. PREFACE This report was prepared by Dr. -
Seasonal Glacier Surface Velocity Fluctuation and Contribution of the Eastern and Western Tributary Glaciers in Amery Ice Shelf, East Antarctica
CZECH POLAR REPORTS 9 (1): 49-60, 2019 Seasonal glacier surface velocity fluctuation and contribution of the Eastern and Western Tributary Glaciers in Amery Ice Shelf, East Antarctica Shridhar Digambar Jawak1,2, Shubhang Kumar3, Alvarinho Joaozinho Luis1, Prashant Hemendra Pandit4*, Sagar Filipe Wankhede1 1Earth System Science Organization (ESSO), National Centre for Polar and Ocean Research (NCPOR), Ministry of Earth Sciences (MoES), Headland Sada, Goa 403804, India 2Svalbard Integrated Arctic Earth Observing System (SIOS), SIOS Knowledge Centre, Svalbard Science Park, P.O. Box 156, N-9171, Longyearbyen, Svalbard, Norway 3Centre for Land Resource Management, Central University of Jharkhand, Ranchi 835205, India 4National Bureau of Soil Survey and Land Use planning (NBSS & LUP) - Indian Agriculture Research Institute (IARI), New Delhi 110012, India Abstract Glaciers play a crucial role in the study of the climate change pattern of the Earth. Re- mote sensing with access to large archives of data has the ability to monitor glaciers frequently throughout the year. Therefore, remote sensing is the most beneficial tool for the study of glacier dynamics. Fed by many tributaries from different sides, the Amery Ice Shelf (AIS) is one of the largest ice shelves that drains ice from the Antarctic ice sheet into the Southern Ocean. This study focuses on the eastern and the western tribu- taries of the AIS. The primary objective of the study was to derive the velocity of the tributary glaciers and the secondary objective was to compare variations in their velocities between the summer and winter season. This study was carried on using the European Space Agency’s (ESA) Sentinel-1 satellite’s Synthetic Aperture Radar (SAR) data acquired from the Sentinel data portal. -
INVESTIGATION of GLACIAL DYNAMICS in the LAMBERT GLACIER- AMERY ICE SHELF SYSTEM (LAS) USING REMOTE SENSING a Dissertation by ZH
INVESTIGATION OF GLACIAL DYNAMICS IN THE LAMBERT GLACIER- AMERY ICE SHELF SYSTEM (LAS) USING REMOTE SENSING A Dissertation by ZHAOHUI CHI Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY Approved by: Chair of Committee, Andrew G. Klein Committee Members, Mahlon C. Kennicutt II Hongxing Liu Sorin C. Popescu Head of Department, Vatche P. Tchakerian December 2012 Major Subject: Geography Copyright 2012 Zhaohui Chi ABSTRACT Numerous recent studies have documented dynamic changes in the behaviors of large marine-terminating outlet glaciers and ice streams in Greenland, the Antarctic Peninsula, and West Antarctica. However, fewer observations of outlet glaciers and ice shelves exist for the East Antarctic Ice Sheet. In addition, most recent surface velocity mappings of the Lambert Glacier-Amery Ice Shelf system (LAS) are derived for the time period of 1997-2000. From this research, surface velocity measurements provide a more extended view of the behavior and stability of the LAS over the past two decades than can be gleaned from a single observational period. This study uses remote sensing to investigate whether significant changes in velocities have occurred from the late 1980’s through the late 2010’s and assesses the magnitude of mass balance changes observed at the grounding line. To accomplish this goal, surface velocities of the LAS from late 1980’s to late 2010’s for three separate time periods are measured. The observed surface velocities of the LAS ranged from 0 to 1300 m yr-1 during 1988-1990. -
And Intra-Annual Surface Velocity Variations at the Southern Grounding Line of Amery Ice Shelf from 2014 to 2018
https://doi.org/10.5194/tc-2020-99 Preprint. Discussion started: 3 June 2020 c Author(s) 2020. CC BY 4.0 License. 1 Inter- and Intra-annual Surface Velocity Variations at the 2 Southern Grounding Line of Amery Ice Shelf from 2014 to 2018 3 Zhaohui Chi1, Andrew G. Klein1 4 1Department of Geography, Texas A&M University, College Station, Texas, 77845-3147, USA 5 Correspondence to: Zhaohui Chi ([email protected]) 6 Abstract. The ice flow rate through the grounding line of the Amery Ice Shelf (AIS) is vital to understanding the mass 7 discharge received from its three primary tributary glaciers. Previous studies have indicated a stable multiyear average 8 surface velocity distribution in the convergence area of AIS. However, the surface velocity variations, especially short- 9 term fluctuations, in the AIS have been relatively undocumented. This study investigated inter-annual and intra-annual 10 surface velocity variations along the southern segment of AIS grounding line from 2014 to 2018. Using feature 11 tracking to derive surface velocity for five consecutive austral summers and winters, it was found that AIS’s upstream 12 end has experienced a steady ~ 5% inter-annual increase in surface velocity. Surface velocity increases were observed 13 in 2014/2015 (0.25±0.02 m/d) and in 2017/2018 (0.21±0.02 m/d) respectively. Surface velocities in winters were 14 lower than the summers except for 2016, which had a 0.12 m/d surface velocity decrease from winter to summer. 15 Although flowing slower than the other two glaciers, Fisher Glacier exhibited the highest inter-annual increase 16 (8.56±4.36%) and the largest intra-annual variation (-5.41±5.65%) in surface velocity of the three studied glaciers. -
Glaciomarine Sedimentation at the Continental Margin of Prydz Bay, East Antarctica: Implications on Palaeoenvironmental Changes During the Quaternary
Alfred-Wegener-Institut für Polar- und Meeresforschung Universität Potsdam, Institut für Erd- und Umweltwissenschaften Glaciomarine sedimentation at the continental margin of Prydz Bay, East Antarctica: implications on palaeoenvironmental changes during the Quaternary Dissertation zur Erlangung des akademischen Grades Doktor der Naturwissenschaften (Dr. rer. nat.) in der Wissenschaftsdisziplin “Geowissenschaften” eingereicht an der Mathematisch-Naturwissenschaftlichen Fakultät der Universität Potsdam von Andreas Borchers Potsdam, 30. November 2010 Published online at the Institutional Repository of the University of Potsdam: URL http://opus.kobv.de/ubp/volltexte/2011/5262/ URN urn:nbn:de:kobv:517‐opus‐52620 http://nbn‐resolving.de/urn:nbn:de:kobv:517‐opus‐52620 Das Höchste, wozu der Mensch gelangen kann, ist das Erstaunen. J. W. von Goethe Acknowledgements This dissertation would not have been possible without the support and help of numerous people to whom I would like to express my gratitude. First, I am highly indebted to PD Dr. Bernhard Diekmann for the possibility to conduct this work under his supervision and for his constant support, whenever discussion or advice was needed. I appreciated his vast expertise and knowledge of marine geology, sedimentology and Quaternary Science that he so enthusiastically shared with me, adding considerably to my experience. Besides being a full-hearted geologist, he is also a great guitarist, which I enjoyed during the past years, especially during the expeditions I had the chance to participate. I would also like to thank Prof. Dr. Hans-Wolfgang Hubberten for his general support and understanding, giving me the opportunity to broaden my knowledge of marine geology in the field. Using the infrastructure of the institute in Potsdam, Bremerhaven and on the world’s oceans has made a major contribution realizing this work.