Imperial College London

ProfessorMartinSiegert

Faculty of Natural SciencesThe Grantham Institute for Climate Change

Co-Director,Grantham Institute forClimate Change&Environment
 
 
 
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Contact

 

+44 (0)20 7594 9666m.siegert Website

 
 
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Assistant

 

Ms Gosia Gayer +44 (0)20 7594 9666

 
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Location

 

Grantham Directors OfficeSherfield BuildingSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

198 results found

Siegert M, Alekhina I, Mikucki J, Rivera A, Bo S, Fricker H, Schroeder D, Kulessa B, Dow Cet al., Antarctic Subglacial Lakes, Antarctic Environments Portal

JOURNAL ARTICLE

Malard LA, Sabacka M, Magiopoulos I, Mowlem M, Hodson A, Tranter M, Siegert MJ, Pearce DAet al., 2019, Spatial Variability of Antarctic Surface Snow Bacterial Communities, FRONTIERS IN MICROBIOLOGY, Vol: 10, ISSN: 1664-302X

JOURNAL ARTICLE

Cooper MA, Jordan TM, Siegert MJ, Bamber JLet al., 2019, Surface Expression of Basal and Englacial Features, Properties, and Processes of the Greenland Ice Sheet, GEOPHYSICAL RESEARCH LETTERS, Vol: 46, Pages: 783-793, ISSN: 0094-8276

JOURNAL ARTICLE

Wang B, Sun B, Wang J, Greenbaum J, Guo J, Lindzey L, Cui X, Young DA, Blankenship DD, Siegert MJet al., 2019, Removal of 'strip noise' in radio-echo sounding data using combined wavelet and 2-D DFT filtering, Annals of Glaciology, ISSN: 0260-3055

© 2019 The Author(s). Radio-echo sounding (RES) can be used to understand ice-sheet processes, englacial flow structures and bed properties, making it one of the most popular tools in glaciological exploration. However, RES data are often subject to 'strip noise', caused by internal instrument noise and interference, and/or external environmental interference, which can hamper measurement and interpretation. For example, strip noise can result in reduced power from the bed, affecting the quality of ice thickness measurements and the characterization of subglacial conditions. Here, we present a method for removing strip noise based on combined wavelet and two-dimensional (2-D) Fourier filtering. First, we implement discrete wavelet decomposition on RES data to obtain multi-scale wavelet components. Then, 2-D discrete Fourier transform (DFT) spectral analysis is performed on components containing the noise. In the Fourier domain, the 2-D DFT spectrum of strip noise keeps its linear features and can be removed with a 'targeted masking' operation. Finally, inverse wavelet transforms are performed on all wavelet components, including strip-removed components, to restore the data with enhanced fidelity. Model tests and field-data processing demonstrate the method removes strip noise well and, incidentally, can remove the strong first reflector from the ice surface, thus improving the general quality of radar data.

JOURNAL ARTICLE

Smith AM, Woodward J, Ross N, Bentley MJ, Hodgson DA, Siegert MJ, King ECet al., 2018, Evidence for the long-term sedimentary environment in an Antarctic subglacial lake, EARTH AND PLANETARY SCIENCE LETTERS, Vol: 504, Pages: 139-151, ISSN: 0012-821X

JOURNAL ARTICLE

Keen P, Saw K, Rundle N, Brown R, Wyatt J, Shorter S, Edwards M, Siegert M, Mowlem Met al., 2018, A mini-corer for precision sampling of the water-sediment interface in subglacial lakes and other remote aqueous environments, LIMNOLOGY AND OCEANOGRAPHY-METHODS, Vol: 16, Pages: 856-867, ISSN: 1541-5856

JOURNAL ARTICLE

Jordan TA, Martin C, Ferraccioli F, Matsuoka K, Corr H, Forsberg R, Olesen A, Siegert Met al., 2018, Anomalously high geothermal flux near the South Pole, SCIENTIFIC REPORTS, Vol: 8, ISSN: 2045-2322

JOURNAL ARTICLE

Jeofry H, Ross N, Le Brocq A, Graham AGC, Li J, Gogineni P, Morlighem M, Jordan T, Siegert MJet al., 2018, Hard rock landforms generate 130 km ice shelf channels through water focusing in basal corrugations, NATURE COMMUNICATIONS, Vol: 9, ISSN: 2041-1723

JOURNAL ARTICLE

Rintoul SR, Chown SL, DeConto RM, England MH, Fricker HA, Masson-Delmotte V, Naish TR, Siegert MJ, Xavier JCet al., 2018, Choosing the future of Antarctica (vol 558, 233, 2018), NATURE, Vol: 562, Pages: E5-E5, ISSN: 0028-0836

JOURNAL ARTICLE

Siegert MJ, Kennicutt MC, 2018, Governance of the Exploration of Subglacial Antarctica, FRONTIERS IN ENVIRONMENTAL SCIENCE, Vol: 6, ISSN: 2296-665X

JOURNAL ARTICLE

Jordan TM, Williams CN, Schroeder DM, Martos YM, Cooper MA, Siegert MJ, Paden JD, Huybrechts P, Bamber JLet al., 2018, A constraint upon the basal water distribution and thermal state of the Greenland Ice Sheet from radar bed echoes, CRYOSPHERE, Vol: 12, Pages: 2831-2854, ISSN: 1994-0416

JOURNAL ARTICLE

Colleoni F, De Santis L, Siddoway CS, Bergamasco A, Golledge NR, Lohmann G, Passchier S, Siegert MJet al., 2018, Spatio-temporal variability of processes across Antarctic ice-bed-ocean interfaces (vol 9, 2289, 2018), NATURE COMMUNICATIONS, Vol: 9, ISSN: 2041-1723

JOURNAL ARTICLE

Colleoni F, De Santis L, Siddoway CS, Bergamasco A, Golledge NR, Lohmann G, Passchier S, Siegert MJet al., 2018, Spatio-temporal variability of processes across Antarctic ice-bed-ocean interfaces, NATURE COMMUNICATIONS, Vol: 9, ISSN: 2041-1723

JOURNAL ARTICLE

Rintoul SR, Chown SL, DeConto RM, England MH, Fricker HA, Masson-Delmotte V, Naish TR, Siegert MJ, Xavier JCet al., 2018, Choosing the future of Antarctica, NATURE, Vol: 558, Pages: 233-241, ISSN: 0028-0836

JOURNAL ARTICLE

Jeofry H, Ross N, Corr HFJ, Li J, Morlighem M, Gogineni P, Siegert MJet al., 2018, A new bed elevation model for the Weddell Sea sector of the West Antarctic Ice Sheet, Earth System Science Data, Vol: 10, Pages: 711-725, ISSN: 1866-3508

We present a new digital elevation model (DEM) of the bed, with a 1 km gridding, of the Weddell Sea (WS) sector of the West Antarctic Ice Sheet (WAIS). The DEM has a total area of ∼ 125 000 km2 covering the Institute, Möller and Foundation ice streams, as well as the Bungenstock ice rise. In comparison with the Bedmap2 product, our DEM includes new aerogeophysical datasets acquired by the Center for Remote Sensing of Ice Sheets (CReSIS) through the NASA Operation IceBridge (OIB) program in 2012, 2014 and 2016. We also improve bed elevation information from the single largest existing dataset in the region, collected by the British Antarctic Survey (BAS) Polarimetric radar Airborne Science Instrument (PASIN) in 2010–2011, from the relatively crude measurements determined in the field for quality control purposes used in Bedmap2. While the gross form of the new DEM is similar to Bedmap2, there are some notable differences. For example, the position and size of a deep subglacial trough (∼ 2 km below sea level) between the ice-sheet interior and the grounding line of the Foundation Ice Stream have been redefined. From the revised DEM, we are able to better derive the expected routing of basal water and, by comparison with that calculated using Bedmap2, we are able to assess regions where hydraulic flow is sensitive to change. Given the potential vulnerability of this sector to ocean-induced melting at the grounding line, especially in light of the improved definition of the Foundation Ice Stream trough, our revised DEM will be of value to ice-sheet modelling in efforts to quantify future glaciological changes in the region and, from this, the potential impact on global sea level. The new 1 km bed elevation product of the WS sector can be found at https://doi.org/10.5281/zenodo.1035488.

JOURNAL ARTICLE

Jeofry H, Ross N, Corr HFJ, Li J, Gogineni P, Siegert MJet al., A new bed elevation model for the Weddell Sea sector of the West Antarctic Ice Sheet, Earth System Science Data, ISSN: 1866-3508

JOURNAL ARTICLE

Siegert MJ, Jamieson SSR, White D, 2018, Exploration of subsurface Antarctica: uncovering past changes and modern processes, Geological Society, London, Special Publications, Vol: 461, Pages: 1-6, ISSN: 0305-8719

JOURNAL ARTICLE

Siegert MJ, 2018, A 60-year international history of Antarctic subglacial lake exploration, Geological Society, London, Special Publications, Vol: 461, Pages: 7-21, ISSN: 0305-8719

JOURNAL ARTICLE

Wang B, Sun B, Martin C, Ferraccioli F, Steinhage D, Cui X, Siegert MJet al., 2018, Summit of the East Antarctic Ice Sheet underlain by thick ice-crystal fabric layers linked to glacial–interglacial environmental change, Geological Society, London, Special Publications, Vol: 461, Pages: 131-143, ISSN: 0305-8719

JOURNAL ARTICLE

Siegert MJ, Kulessa B, Bougamont M, Christoffersen P, Key K, Andersen KR, Booth AD, Smith AMet al., 2018, Antarctic subglacial groundwater: a concept paper on its measurement and potential influence on ice flow, Geological Society, London, Special Publications, Vol: 461, Pages: 197-213, ISSN: 0305-8719

JOURNAL ARTICLE

Jeofry H, Ross N, Corr HFJ, Li J, Gogineni P, Siegert MJet al., 2018, A deep subglacial embayment adjacent to the grounding line of Institute Ice Stream, West Antarctica, Geological Society, London, Special Publications, Vol: 461, Pages: 161-173, ISSN: 0305-8719

JOURNAL ARTICLE

Wrona T, Wolovick MJ, Ferraccioli F, Corr H, Jordan T, Siegert MJet al., 2018, Position and variability of complex structures in the central East Antarctic Ice Sheet, Geological Society, London, Special Publications, Vol: 461, Pages: 113-129, ISSN: 0305-8719

JOURNAL ARTICLE

Beem LH, Cavitte MGP, Blankenship DD, Carter SP, Young DA, Muldoon GR, Jackson CS, Siegert MJet al., 2018, Ice-flow reorganization within the East Antarctic Ice Sheet deep interior, Geological Society, London, Special Publications, Vol: 461, Pages: 35-47, ISSN: 0305-8719

JOURNAL ARTICLE

Morlighem M, Williams CN, Rignot E, An L, Arndt JE, Bamber JL, Catania G, Chauche N, Dowdeswell JA, Dorschel B, Fenty I, Hogan K, Howat I, Hubbard A, Jakobsson M, Jordan TM, Kjeldsen KK, Millan R, Mayer L, Mouginot J, Noel BPY, O'Cofaigh C, Palmer S, Rysgaard S, Seroussi H, Siegert MJ, Slabon P, Straneo F, van den Broeke MR, Weinrebe W, Wood M, Zinglersen KBet al., 2017, BedMachine v3: Complete Bed Topography and Ocean Bathymetry Mapping of Greenland From Multibeam Echo Sounding Combined With Mass Conservation, GEOPHYSICAL RESEARCH LETTERS, Vol: 44, Pages: 11051-11061, ISSN: 0094-8276

JOURNAL ARTICLE

Parrenin F, Cavitte MGP, Blankenship DD, Chappellaz J, Fischer H, Gagliardini O, Masson-Delmotte V, Passalacqua O, Ritz C, Roberts J, Siegert MJ, Young DAet al., 2017, Is there 1.5-million-year-old ice near Dome C, Antarctica?, CRYOSPHERE, Vol: 11, Pages: 2427-2437, ISSN: 1994-0416

JOURNAL ARTICLE

Siegert MJ, 2017, Why Should We Worry About Sea Level Change?, Frontiers for Young Minds, Vol: 5

JOURNAL ARTICLE

Roberts J, Curran M, Poynter S, Moy A, van Ommen T, Vance T, Tozer C, Graham FS, Young DA, Plummer C, Pedro J, Blankenship D, Siegert Met al., 2017, Correlation confidence limits for unevenly sampled data, COMPUTERS & GEOSCIENCES, Vol: 104, Pages: 120-124, ISSN: 0098-3004

JOURNAL ARTICLE

Jordan TM, Cooper MA, Schroeder DM, Williams CN, Paden JD, Siegert MJ, Bamber JLet al., 2017, Self-affine subglacial roughness: consequences for radar scattering and basal water discrimination in northern Greenland, CRYOSPHERE, Vol: 11, Pages: 1247-1264, ISSN: 1994-0416

JOURNAL ARTICLE

Graham FS, Roberts JL, Galton-Fenzi BK, Young D, Blankenship D, Siegert MJet al., 2017, A high-resolution synthetic bed elevation grid of the Antarctic continent, EARTH SYSTEM SCIENCE DATA, Vol: 9, Pages: 267-279, ISSN: 1866-3508

JOURNAL ARTICLE

Roberts J, Galton-Fenzi B, Paolo F, Donnelly C, Gwyther D, Padman L, Young D, Warner R, Greenbaum J, Fricker H, Payne AJ, Cornford S, Le Brocq A, Van Ommen T, Blankenship DD, Siegert MJet al., Ocean forced variability of Totten Glacier mass loss, Special Publication - Geological Society of London, ISSN: 0305-8719

A large volume of the East Antarctic Ice Sheet drains through the Totten Glacier (TG) and is thought to be a potential source of substantial global sea level rise over the coming centuries. We show the flow and surface height of floating part of TG, which buttresses the grounded component, have varied substantially over two decades (1989–2011), with variations in surface height and basal melt rates highly anti-correlated (r=0.70, p<0.05). Coupled glacier/ice-shelf simulations confirm ice flow and thickness respond to both basal melting of the ice shelf and grounding on bed obstacles. We conclude the observed variability of TG is primarily ocean-driven and enhanced ice-sheet dynamism, leading to upstream grounded ice loss, will occur from the region with ocean warming.

JOURNAL ARTICLE

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