DOCSLIB.ORG

162 2Nd Issue 2013

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
162 2Nd Issue 2013 ISSN 0019–1043 Ice News Bulletin of the International Glaciological Society Number 162 2nd Issue 2013 Contents 2 From the Editor 38 New Honorary Member – 4 The Russian contribution to snow science Professor Yang Zhenniang Sergey Sokratov 38 Staff changes 10 International Glaciological Society 39 Obituary: Sigfús Johnsen, 1940–2013 10 Journal of Glaciology 41 First Circular: International Symposium 11 Annals of Glaciology 55(66) on Glaciology in High-Mountain Asia, 12 Romance of the Three Poles – Report Kathmandu, Nepal, March 2015 from the IGS Beijing Symposium 46 Forthcoming events 25 Annual General Meeting 2013 46 International Summer School in 32 British Branch Meeting, Loughborough, Glaciology, McCarthy, Alaska, USA, 3–5 September 2013 August 2014 35 News 47 Glaciological diary 35 Richardson Medal for John W. Glen 50 New members Cover picture: The glaciers and ice core drilling expedition in Naimona’nyi, southwestern Tibetan Plateau. Photography by Lide Tian, ITP-CAS, Beijing, China. EXCLUSION CLAUSE. While care is taken to provide accurate accounts and information in this Newsletter, neither the editor nor the International Glaciological Society undertakes any liability for omissions or errors. 1 From the Editor Dear IGS member The festive season is fast approaching and it If we look at these things individually I is time to get this ICE issue out. Once again will try and share with you the thoughts of open access and its potential impact on the the IGS Council and the steps that have been operation of the Society is the main topic of taken so far. this editorial. Publication. We are now being more The IGS Council discussed the imple- assertive with authors of Journal and Annals mentation and likely effects of open access papers in our efforts to recover full page on the running of the Society at its meeting charges. Those of you submitting papers will held in Beijing in July. have noticed that you are now required to In the past, institutional and library tick a box saying you are aware of the page subscriptions to the Journal and Annals of charges and realize these have to be paid. Glaciology have subsidized the various In the past, participation in an IGS activities of the IGS (e.g. to provide scholar- symposia has entitled a participant ships, travel grants, student exchanges and submitting a paper to a thematic Annals grants for students to attend symposia and issue with a similar theme to the symposium workshops). This is a common business s/he is attending to four page-charge-free model of the various independent learned pages in that issue. However, starting with societies in the UK and so ours is not the the thematic issue on ‘Sea Ice in a Changing only organization that has to deal with Environment’ (paper deadline 20 December these issues. 2013), all authors will now be required to The Society has three main operations: the pay full page charges. At present, the Society membership, the publication of the Journal, is charged a processing fee of US$30 for each Annals and ICE, and the IGS symposia. With submission to our online submission system. the anticipated changes resulting from going Another thing the IGS Council is considering open access, we will have to ensure that is passing some or all of this cost on to each of these activities is self-sustaining. submitting authors (regardless of whether the Page charges will have to cover the cost of paper in question is accepted or not). publication, registration fees will have to Having laid out this ‘tougher’ policy cover the cost of attending a symposium on page charges, Council has however and membership fees will have to cover reaffirmed its commitment to continue to the cost of supporting our members and the provide waivers and discounts in cases of distribution of our publications to them. financial hardship. 2 As there is no page-charge income for Membership. Although production of the IGS newsletter, Council has decided to Journal of Glaciology papers (i.e. copy-editing, stop printing ICE and only publish it online, style-setting, typesetting, proof-checking, etc.) starting with ICE 164. The next issue of ICE is shared by all, it does not seem fair that the (163) will be the last to be mass-printed on limited society membership fees should go paper. However, we will continue to print towards subsidizing printing and shipping, a few copies of ICE to send to some of our particularly since more and more members esteemed members who do not have access are opting for ‘online-only’ membership. to the Internet. Increasingly, we are moving towards a system Symposia. As I have already mentioned, in which those of us who wish to receive a we will no longer grant participants four hard copy of the Journal bear the cost of page-charge-free pages. In addition, printing and shipping. Council have decided participants in the respective symposium not to make this transition in one fell swoop will no longer receive a hard copy of the but to spread it over 3 years. This means that Annals in question, although they will have we will have to increase the ‘combined’ full access to it online. Of course, members membership fees considerably in stages over will be able to purchase the issue at a the next 3 years. However, the ‘online-only’ ‘members rate’. Unfortunately, this does not membership will remain unchanged next mean that the registration fee will reduce; in year, for the third year in a row. fact the fees may have to increase (although We have now set the online membership we are attempting to get some commercial page up in such a way that you no longer have sponsors and grants to help keep the price to log in separately to access recent papers on down). IGS symposia are very elaborate and Ingenta. In order to have full access to all IGS generous events and delegates get a lot for publications (irrespective of where they are their money, with icebreakers, banquets, hosted), it should now be sufficient just to log mid-week excursions, refreshments during in as a member on our website. breaks all week, sometimes lunch and At the time of writing, members have additional events such as BBQs all included started renewing their membership. I would (all good value, particularly when one like to ask all members who are opting for considers that at some big conferences one the ‘combined’ membership (i.e. those of you does not even get a free cup of coffee!). With wanting to continue to receive hard copies of the help of the local organizers, the Society the Journal) to renew promptly. The first issue will continue to solicit grants that will enable of 2014, issue 219, will be finished very early us to support students and young scientists in the new year. And it is most economical if wanting to attend. For our next two symposia we can ship all hard copies out at the time it is clear that we have some funding to do of publication. It is very expensive to send just that. IGS symposia will continue to be an copies out individually. enjoyable and useful experience and a great So far almost 350 members have place to meet your peers, strengthen existing renewed. The total tally for 2013 was 930 collaborations and forge new ones. members, 20 down from last year. I trust that we will reach the 1000 mark in 2014. Magnús Már Magnússon Secretary General 3 The Russian contribution to snow science Perhaps the most exhaustive list of Russian (Soviet) ‘summer’s heat’. He defined the ‘freeze layer’ achievements in cryospheric research published in the atmosphere and mentioned a number of in English contains almost no purely snow-related thermophysical phenomena related to ice and publications (Kotlyakov, 1997). However, this does snow. However, the beginning of snow research not mean that snow research was not a focus of in Russia is usually linked with the name of A.I. Russian scientists. Russian-language reviews exist Voeikov (1842–1916). Voeikov (Hooson, 1968) (e.g. Sokratov and Troshkina, 2009, although this considered climatology and meteorology to be does not focus solely on Russian developments) among the main fields of his scientific interests. and show that, in Russia, snow cover was always Because of the climatic conditions of the Russian considered one of the most important components Empire, snow cover was an inevitable part of of the environment. The often specific nature of the practically any scientific research in the field. The approach taken was mainly due to the large scale stated aim of snow cover studies was expressed by of the country and the variety of environmental Voeikov in terms of the effect of snow cover on soil conditions found within it. This often makes the ideas conditions, with reference to German studies of the involved and the results obtained rather difficult for influence of snow cover on crops (Wollny, 1877). the international scientific community to interpret. Particular interest was expressed in the converse Modern Russian cryospheric literature effect of snow cover on climate and on weather. originates from the early works of M.V. Lomonosov. This took the form of a book published by the His seminal works (Shiltsev, 2012) include ideas Imperial Academy of Sciences (Voeikov, 1889). on latitudinal and altitudinal climatic belting in Probably more important was Voeikov’s interaction between the ‘winter’s cold’ and the active participation in the establishment of a Fig. 1. Photograph: ‘Snowflakes; micro-photographic images from nature: A. Sigson: Rybinsk’. End of the 19th century. 61.2 × 90.7 cm.
Load more

Recommended publications
  • Dustin M. Schroeder
    Dustin M. Schroeder Assistant Professor of Geophysics Department of Geophysics, School of Earth, Energy, and Environmental Sciences 397 Panama Mall, Mitchell Building 361, Stanford University, Stanford, CA 94305 [email protected], 440.567.8343 EDUCATION 2014 Jackson School of Geosciences, University of Texas, Austin, TX Doctor of Philosophy (Ph.D.) in Geophysics 2007 Bucknell University, Lewisburg, PA Bachelor of Science in Electrical Engineering (B.S.E.E.), departmental honors, magna cum laude Bachelor of Arts (B.A.) in Physics, magna cum laude, minors in Mathematics and Philosophy PROFESSIONAL EXPERIENCE 2016 – present Assistant Professor of Geophysics, Stanford University 2017 – present Assistant Professor (by courtesy) of Electrical Engineering, Stanford University 2020 – present Center Fellow (by courtesy), Stanford Woods Institute for the Environment 2020 – present Faculty Affiliate, Stanford Institute for Human-Centered Artificial Intelligence 2021 – present Senior Member, Kavli Institute for Particle Astrophysics and Cosmology 2016 – 2020 Faculty Affiliate, Stanford Woods Institute for the Environment 2014 – 2016 Radar Systems Engineer, Jet Propulsion Laboratory, California Institute of Technology 2012 Graduate Researcher, Applied Physics Laboratory, Johns Hopkins University 2008 – 2014 Graduate Researcher, University of Texas Institute for Geophysics 2007 – 2008 Platform Hardware Engineer, Freescale Semiconductor SELECTED AWARDS 2021 Symposium Prize Paper Award, IEEE Geoscience and Remote Sensing Society 2020 Excellence in Teaching Award, Stanford School of Earth, Energy, and Environmental Sciences 2019 Senior Member, Institute of Electrical and Electronics Engineers 2018 CAREER Award, National Science Foundation 2018 LInC Fellow, Woods Institute, Stanford University 2016 Frederick E. Terman Fellow, Stanford University 2015 JPL Team Award, Europa Mission Instrument Proposal 2014 Best Graduate Student Paper, Jackson School of Geosciences 2014 National Science Olympiad Heart of Gold Award for Service to Science Education 2013 Best Ph.D.
    [Show full text]
  • Ice News Bulletin of the International
    ISSN 0019–1043 Ice News Bulletin of the International Glaciological Society Number 172 3rd Issue 2016 Contents 2 From the Editor 18 Presentation of Honorary Membership to 4 Blog: New Chief Editor for the Professor Keiji Higuchi International Glaciological Society 19 New office for the IGS 5 International Glaciological Society 20 Second Circular: International Symposium 5 Journal of Glaciology on Polar Ice, Polar Climate, Polar Change, 7 Creative Commons licensing Boulder, CO, USA, August 2017 8 Report on the IGS Symposium La Jolla, CA, 32 First Circular: International Symposium on July 2016 Cryosphere and Biosphere, Kyoto, Japan, 13 Report on the British Branch Meeting, March 2018 Southampton, September 2016 36 Glaciological diary 15 News 39 New members 15 Report from the Summer School, McCarthy, Alaska, June 2016 Cover picture: Glacier de Gébroulaz, Vanoise, France, August 2015. Measurements of flow velocity, thickness variation and mass balance are taken several times a year on this glacier by Glacioclim (Laboratoire de Glaciologie et Géophysique de l’Environnement, Grenoble, France). Photo by Coline Bouchayer. EXCLUSION CLAUSE. While care is taken to provide accurate accounts and information in this Newsletter, neither the editor nor the International Glaciological Society undertakes any liability for omissions or errors. 1 From the Editor Dear IGS member Welcome to the third and last issue of ICE breaks (as opposed to running across the for 2016. In this editorial I would like to street looking for a Starbucks and once discuss IGS symposia and in particular our there waiting in line for half an hour) so registration fees. We are regularly criticized this is an excellent opportunity to grab the for setting the registration fees too high and speakers from the previous session and told that people will be unable to attend discuss their presentations.
    [Show full text]
  • Non-Gaussian Statistical Analysis of Polarimetric Synthetic Aperture Radar Images
    FACULTY OF SCIENCE AND TECHNOLOGY DEPARTMENT OF PHYSICS AND TECHNOLOGY Non-Gaussian Statistical Analysis of Polarimetric Synthetic Aperture Radar Images Anthony Paul Doulgeris A dissertation for the degree of Philosophiae Doctor February 2011 Abstract This thesis describes general methods to analyse polarimetric synthetic aperture radar images. The primary application is for unsupervised image segmentation, and fast, practical methods are sought. The fundamental assumptions and statistical modelling are derived from the phys- ics of electromagnetic scattering from distributed targets. The physical basis directly leads to the image phenomenon called speckle, which is shown to be potentially non- Gaussian and several statistical distributions are investigated. Speckle non-Gaussianity and polarimetry both hold pertinent information about the target medium and methods that utilise both attributes are developed. Two distinct approaches are proposed: a local feature extraction method; and a model-based clustering algorithm. The local feature extraction approach creates a new six-dimensional description of the image that may be used for subsequent image analysis or for physical parameter extraction (inversion). It essentially extends standard polarimetric features with the addition of a non-Gaussianity measure for texture. Importantly, the non-Gaussianity measure is model independent and therefore does not unduly constrain the analysis. Unsupervised image segmentation is demonstrated with good results. The model-based approach describes a Bayesian clustering algorithm for the K- Wishart model, with fast moment based parameter estimation, and incorporates both non-Gaussianity and polarimetry. The initial implementation requires the number of classes, and initial segmentation, and the effective number of looks (an important model parameter) to be given in advance.
    [Show full text]
  • Five Decades of Radioglaciology
    Annals of Glaciology Five decades of radioglaciology Dustin M. Schroeder1,2, Robert G. Bingham3, Donald D. Blankenship4, Knut Christianson5, Olaf Eisen6,7 , Gwenn E. Flowers8 , Nanna B. Karlsson9 , Michelle R. Koutnik5, John D. Paden10 and Martin J. Siegert11 Article 1Department of Geophysics, Stanford University, Stanford, USA; 2Department of Electrical Engineering, Stanford University, Stanford, USA; 3School of GeoSciences,University of Edinburgh, Edinburgh, UK; 4Institute for Cite this article: Schroeder DM et al. (2020). Geophysics, University of Texas, Austin, USA; 5Department of Earth and Space Sciences, University of Washington, Five decades of radioglaciology. Annals of 6 Glaciology 61(81), 1–13. https://doi.org/ Seattle, USA; Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, 7 8 10.1017/aog.2020.11 Germany; University of Bremen, Bremen, Germany; Department of Earth Sciences, Simon Fraser University, Vancouver, Canada; 9Geological Survey of Denmark and Greenland, Copenhagen, Denmark; 10Center for the Received: 2 December 2019 Remote Sensing of Ice Sheets, University of Kansas, Lawrence, USA and 11Grantham Institute, and Department Revised: 11 February 2020 of Earth Science and Engineering, Imperial College London, London, UK Accepted: 11 February 2020 First published online: 9 March 2020 Abstract Keywords: Radar sounding is a powerful geophysical approach for characterizing the subsurface conditions glaciological instruments and methods; ground-penetrating radar; radio-echo of terrestrial and planetary ice masses at local to global scales. As a result, a wide array of orbital, sounding; remote sensing airborne, ground-based, and in situ instruments, platforms and data analysis approaches for radioglaciology have been developed, applied or proposed. Terrestrially, airborne radar sounding Author for correspondence: has been used in glaciology to observe ice thickness, basal topography and englacial layers for five Dustin M.
    [Show full text]
  • Krista Marie Soderlund the University of Texas at Austin Institute for Geophysics, John A
    Krista Marie Soderlund The University of Texas at Austin Institute for Geophysics, John A. & Katherine G. Jackson School of Geosciences J.J. Pickle Research Campus, Bldg. 196 (ROC), 10100 Burnet Rd. (R2200), Austin, TX 78758-4445 [email protected], Office: 512-471-0449, Cell: 218-349-3006, FAX: 512-471-8844 Research Interests Geophysical Fluid Dynamics, Magnetohydrodynamics, Planetary Science, Cryosphere Education University of California, Los Angeles Ph.D., Geophysics and Space Physics, 2011 M.S., Geophysics and Space Physics, 2009 Florida Institute of Technology B.S., Double major in Physics & Space Science, 2005, Summa Cum Laude Employment University of Texas at Austin, Institute for Geophysics Research Associate, September 2014-Present UTIG Postdoctoral Fellow, October 2011-September 2014 University of California, Los Angeles, Department of Earth and Space Sciences Graduate Student Researcher, Advisor: Dr. Jonathan M. Aurnou, 2006-2011 California Institute of Technology, Division of Geological and Planetary Sciences Summer Undergraduate Research Fellow, Dr. Joann M. Stock, 2005 NASA Jet Propulsion Laboratory, CA Consultant, Dr. Bonnie J. Buratti, 2006 Planetary Geology & Geophysics Undergrad Research Program, Dr. B.J. Buratti, 2004 Florida Institute of Technology, Department of Physics and Space Science Undergraduate Researcher, Dr. Niescja E. Turner, 2004-2005 Naval Oceanographic Office, Hydrology Code, Stennis Space Center, MS Physical science aid, 2003 Mission Experience Saturn Probe Interior and aTmosphere Explorer (SPRITE)
    [Show full text]
  • Chapter 16 Glaciers As Landforms: Glaciology
    Chapter 16 j Glaciers as Landforms: Glaciology Of all thewater near the surface of the earth, only about by the rheidity of ice (p. 13), important differences are 2 percent is on the land, in the solid state as glacier ice to be noted whether flow is confined or unconfined. (Figure 2-5). Even this small fraction is sufficient to Glaciers originate in regions where snow accumu­ cover entirely one continent (Antarctica) and most of lation exceeds loss, and they flow outward or down­ the largest island (Greenland) with ice to an average ward to regions where losses exceed accumulation thickness of 2.2 km over Antarctica and 1.5 km over (Figure 16-2). The terminus, or downglacier extremity, Greenland. At the present time, about 10 percent of the represents the line where losses by all causes (melting, earth's land area is ice covered. An additional 20 per­ sublimation, erosion, and calving into water: collec­ cent has been ice covered repeatedly during the glacia­ tively termed ablation) equal the rate at which ice can tions of the Pleistocene Epoch, much of it as recently as be supplied by accumulation and forward motion. 15,000 to 20,000 years ago. Glaciation has been the Some valley glaciers have steep ice faces at their ter­ dominant factor in shaping the present landscape of mini, but others end deeply buried in transported rock North America northward of the Ohio and Missouri debris, so that the exact location of the terminus is rivers and of Eurasia northward of a line from Dublin uncertain.
    [Show full text]
  • Evidence for Possible New Subglacial Lakes Along a Radar Transect Crossing the Belgica Highlands and the Concordia Trench
    View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Earth-prints Repository Terra Antartica Reports 2008, 14, 000-000 (4 pp - 2 colour p) Evidence for Possible New Subglacial Lakes along a Radar Transect Crossing the Belgica Highlands and the Concordia Trench A. FORIERI1*, I.E. TABACCO1, L. CAFARELLA2, S. URBINI2, C. BIANCHI2, A. ZIRIZZOTTI2 1Università degli Studi di Milano, Sez. Geofi sica, Via Cicognara 7, 20129 Milano - Italia 2Istituto Nazionale Geofi sica e Vulcanologia, Via di Vigna Murata 605, 00143 Roma - Italia *Corresponding author ([email protected]) INTRODUCTION Subglacial lakes are of great interest to the scientifi c community, and more than 140 lakes have been identifi ed in Antarctica and catalogued (Siegert et al., 2005, Cafarella et al., 2006). We report on the possible existence of 5 new subglacial lakes in the area between the Belgica HighLands and the Concordia Trench. Analysis of radar data collected during the 2003 Antarctic fi eld survey reveals particularly strong radar echoes coming from the subglacial interface. As radar surveys are only one of the methods used to identify subglacial lakes, the presence of these 5 new lakes must be discussed and confi rmed through other geophysical investigations. DATA COLLECTION AND PROCESSING During the Italian Antarctic fi eld survey in 2003, airborne radar measurements were made around Dome C (Fig. 1) to better defi ne geological structures such as the Concordia and Aurora trenches and the Concordia, Aurora and Vincennes subglacial lakes (Forieri et al., 2004). Data were collected with a radar system operating at 60 MHz frequency and acquiring 10 traces s-1 with a pulse length of 1 μs.
    [Show full text]
  • Instruments and Methods an Improved Coherent Radar Depth Sounder
    Journal of Glaciology, Vol. 44, No. 148, 1998 Instruments and Methods An improved coherent radar depth sounder 2 3 1 S. GoGINENI,1 T. CHUAH, C. ALLEN,1 K. jEZEK, R. K. MooRE 1Radar Systems and Remote Sensing Laboratory, The University of Kansas, 2291 Irving Hill Road, Lawrence, Kansas 66045-2969, US.A. 2Silicon Wireless, 2025 Garcia Avenue, Mountain View, California 94043, US.A. 3 Byrd Polar Research Center, The Ohio State University, 108 Scott Hall, 1090 Carmack Road, Columbus, Ohio 43210-1002, US.A. ABSTRACT. The University of Kansas developed a coherent radar depth sounder during the 1980s. This system was originally developed for glacial ice-thickness measure- ments in the Antarctic. During the field tests in the Antarctic and Greenland, we found the system performance to be less than optimum. The field tests in Greenland were per- formed in 1993, as a part of the NASA Program for Arctic Climate Assessment ( PARCA ). We redesigned and rebuilt this system to improve the performance. The radar uses pulse compression and coherent signal processing to obtain high sensi- tivity and fine along-track resolution. It operates at a center frequency of 150 MHz with a radio frequency bandwidth of about 17 MHz, which gives a range resolution of about 5 m in ice. We have been operating it from a NASA P-3 aircraft for collecting ice-thickness data in conjunction with laser surface-elevation measurements over the Greenland ice sheet during the last 4 years. We have demonstrated that this radar can measure the thick- ness of more than 3 km of cold ice and can obtain ice-thickness information over outlet glaciers and ice margins.
    [Show full text]
  • Glacial Geomorphology: Towards a Convergence of Glaciology And
    Article Progress in Physical Geography 34(3) 327–355 ª The Author(s) 2010 Glacial geomorphology: Reprints and permission: sagepub.co.uk/journalsPermissions.nav Towards a convergence of DOI: 10.1177/0309133309360631 glaciology and geomorphology ppg.sagepub.com Robert G. Bingham British Antarctic Survey and University of Aberdeen, UK Edward C. King British Antarctic Survey, UK Andrew M. Smith British Antarctic Survey, UK Hamish D. Pritchard British Antarctic Survey, UK Abstract This review presents a perspective on recent trends in glacial geomorphological research, which has seen an increasing engagement with investigating glaciation over larger and longer timescales facilitated by advances in remote sensing and numerical modelling. Remote sensing has enabled the visualization of deglaciated landscapes and glacial landform assemblages across continental scales, from which hypotheses of millennial-scale glacial landscape evolution and associations of landforms with palaeo-ice streams have been developed. To test these ideas rigorously, the related goal of imaging comparable subglacial landscapes and landforms beneath contemporary ice masses is being addressed through the application of radar and seismic technologies. Focusing on the West Antarctic Ice Sheet, we review progress to date in achieving this goal, and the use of radar and seismic imaging to assess: (1) subglacial bed morphology and roughness; (2) subglacial bed reflectivity; and (3) subglacial sediment properties. Numerical modelling, now the primary modus operandi of ‘glaciologists’
    [Show full text]
  • Ocean Sciences Across the Solar System
    Ocean Sciences Across the Solar System FOREWORD The 2016 Congressional Commercial Justice Science and Related Agencies appropriations bill tasked NASA in creating an Ocean Worlds Exploration Program. Their direction for this program was to seek out and discover extant life in Habitable Worlds within the Solar System. In support of these efforts, the Roadmaps to Ocean Worlds (ROW) group puBlished a roadmap to identify and prioritize science oBjectives for ocean worlds over the next several decades (Hendrix et al. 2019). This roadmap has helped prioritize the exploration of ocean worlds. In order for this to be effectuated, a framework of interdisciplinary experts in both Earth and Planetary science is needed. In 2019, NASA established a cross divisional research network to coordinate and enhance NASA funded researchers called the Network for Ocean Worlds. Ocean Sciences Across the Solar System (OASS) was cultivated as a result of this effort, building upon the ROW. OASS is a collaborative effort between Earth and Planetary scientists focusing on the advancement of research related to Ocean Worlds. The coordinated efforts of scientists that work in both Earth’s ocean and oceans in other parts of the Solar System will allow knowledge gaps to be filled and opportunities to be identified for testable ideas based upon existing knowledge of the Earth’s system. Synergistic research questions and collaborations between Earth and Planetary scientists will be developed to further our understanding of Ocean Worlds. An ‘ocean world’ can be defined as a body which plausibly can have or is known to have an existing liquid ocean. Several of these potential candidates have been identified in our own solar system, including Europa, Enceladus and Titan.
    [Show full text]
  • Grantham Institute and Department of Earth Science and Engineering Imperial College London
    Grantham Institute and Department of Earth Science and Engineering Imperial College London South Kensington Campus London SW7 2AZ Muhammad Hafeez Jeofry PhD student [email protected] 30 January 2018 Response to Reviewers’ comments on manuscript #essd-2017-90 Dear Sir/Madam, Many thanks for reviewing the above paper. The comments are positive, reasonable and helpful. We have revised and made some adjustments to the paper accordingly, and below we detail the changes that have been made. We hope that the paper is now ready for publication in Earth System Science Data. Sincerely, Hafeez Jeofry (and on behalf of co-authors) Referee #1 Line 24: "This has" or "These have" Noted, however, the statement has been removed. Lines 56-59: It’s not clear what purpose this paragraph serves. Consider cutting. Noted, the paragraph has been deleted. Line 188: Your analysis, rather than RES, assumes this. RES can be done with other assumptions. Clarify. Noted, the statement has been change to “We assume Airborne RES propagates…” Line 343: Capitalize "Institute Ice Stream" Noted, change has been made. Referee #2 Line 187: An instrument cannot make assumptions, only its operators and those who interpret its data can. Further, the velocity used is an uncertainty of the order of 1%, because it depends on the well constrained but imperfectly known real part of the relative permittivity of pure ice and spatially variable densification. The mention of this velocity raises two important questions: 1. How is its (unstated) uncertainty incorporated into the error budget for the new bed topography? 2. Was this velocity used to correct the travel times between the surface and bed reflections for all datasets in this study? That’s never explicitly stated.
    [Show full text]
  • Velocity Anomaly of Campbell Glacier, East Antarctica, Observed by Double-Differential Interferometric SAR and Ice Penetrating Radar
    remote sensing Technical Note Velocity Anomaly of Campbell Glacier, East Antarctica, Observed by Double-Differential Interferometric SAR and Ice Penetrating Radar Hoonyol Lee 1 , Heejeong Seo 1,2, Hyangsun Han 1,* , Hyeontae Ju 3 and Joohan Lee 3 1 Department of Geophysics, Kangwon National University, Chuncheon 24341, Korea; [email protected] (H.L.); [email protected] (H.S.) 2 Earthquake and Volcano Research Division, Korea Meteorological Administration, Seoul 07062, Korea 3 Department of Future Technology Convergence, Korea Polar Research Institute, Incheon 21990, Korea; [email protected] (H.J.); [email protected] (J.L.) * Correspondence: [email protected]; Tel.: +82-33-250-8589 Abstract: Regional changes in the flow velocity of Antarctic glaciers can affect the ice sheet mass balance and formation of surface crevasses. The velocity anomaly of a glacier can be detected using the Double-Differential Interferometric Synthetic Aperture Radar (DDInSAR) technique that removes the constant displacement in two Differential Interferometric SAR (DInSAR) images at different times and shows only the temporally variable displacement. In this study, two circular-shaped ice- velocity anomalies in Campbell Glacier, East Antarctica, were analyzed by using 13 DDInSAR images generated from COSMO-SkyMED one-day tandem DInSAR images in 2010–2011. The topography of the ice surface and ice bed were obtained from the helicopter-borne Ice Penetrating Radar (IPR) surveys in 2016–2017. Denoted as A and B, the velocity anomalies were in circular shapes with radii Citation: Lee, H.; Seo, H.; Han, H.; of ~800 m, located 14.7 km (A) and 11.3 km (B) upstream from the grounding line of the Campbell Ju, H.; Lee, J.
    [Show full text]