@article {253, title = {Run-away thinning of the low elevation {Yakutat Glacier} and its sensitivity to climate change}, journal = {Journal of Glaciology}, volume = {61}, year = {2015}, doi = {10.3189/2015JoG14J125}, author = {Truessel, Barbara and Martin Truffer and Regine Hock and Roman Motyka and Matthias Huss and Jing Zhang} } @article {2013/08/01, title = {Challenges to Understanding the Dynamic Response of Greenland{\textquoteright}s Marine Terminating Glaciers to Oceanic and Atmospheric Forcing}, journal = {Bulletin of the American Meteorological Society}, volume = {94}, year = {2013}, month = {2013/08/01}, pages = {1131 - 1144}, doi = {10.1175/BAMS-D-12-00100.1}, url = {http://dx.doi.org/10.1175/BAMS-D-12-00100.1}, author = {Straneo, Fiammetta and Heimbach, Patrick and Sergienko, Olga and Hamilton, Gordon and Catania, Ginny and Griffies, Stephen and Hallberg, Robert and Jenkins, Adrian and Joughin, Ian and Motyka, Roman and Pfeffer, W. Tad and Stephen F. Price and Eric Rignot and Scambos, Ted and Martin Truffer and Vieli, Andreas} } @article {11/2013, title = {Changing basal conditions during the speed-up of Jakobshavn Isbr{\ae}, Greenland}, journal = {The Cryosphere}, volume = {7}, year = {2013}, month = {11/2013}, pages = {1679{\textendash}1692}, author = {Habermann, M and Martin Truffer and Maxwell, D} } @article {152, title = {Rapid Submarine Melting Driven by Subglacial Discharge, LeConte Glacier, Alaska}, journal = {Geophysical Research Letters}, volume = {40}, year = {2013}, abstract = {We show that subglacial freshwater discharge is the principal process driving high rates of submarine melting at tidewater glaciers. This buoyant discharge draws in warm seawater, entraining it in a turbulent upwelling flow along the submarine face that melts glacier ice. To capture the effects of subglacial discharge on submarine melting, we conducted 4 days of hydrographic transects during late summer 2012 at LeConte Glacier, Alaska. A major rainstorm allowed us to document the influence of large changes in subglacial discharge. We found strong submarine melt fluxes that increased from 9.1 {\textpm} 1.0 to 16.8 {\textpm} 1.3 m d-1 (ice face equivalent frontal ablation) as a result of the rainstorm. With projected continued global warming and increased glacial runoff, our results highlight the direct impact that increases in subglacial discharge will have on tidewater outlet systems. These effects must be considered when modeling glacier response to future warming and increased runoff.}, keywords = {frontal ablation, submarine melting, tidewater glaciers}, issn = {1944-8007}, doi = {10.1002/grl.51011}, url = {http://dx.doi.org/10.1002/grl.51011}, author = {Roman J. Motyka and Dryer, W. P. and Jason M Amundson and Martin Truffer and Mark Fahnestock} } @article {153, title = {On the seasonal freshwater stratification in the proximity of fast-flowing tidewater outlet glaciers in a sub-Arctic sill fjord}, journal = {Journal of Geophysical Research: Oceans}, volume = {118}, year = {2013}, pages = {1382{\textendash}1395}, abstract = {The Greenland Ice Sheet releases large amounts of freshwater into the fjords around Greenland and many fjords are in direct contact with the ice sheet through tidewater outlet glaciers. Here we present the first seasonal hydrographic observations from the inner part of a sub-Arctic fjord, relatively close to and within 4{\textendash}50 km of a fast-flowing tidewater outlet glacier. This region is characterized by a dense glacial and sea ice cover. Freshwater from runoff, subglacial freshwater (SgFW) discharge, glacial, and sea ice melt are observed above 50{\textendash}90 m depth. During summer, SgFW and subsurface glacial melt mixed with ambient water are observed as a layered structure in the temperature profiles below the low-saline summer surface layer (<7 m). During winter, the upper water column is characterized by stepwise halo- and thermoclines formed by mixing between deeper layers and the surface layer influenced by ice melt. The warm (T > 1{\textdegree}C) intermediate water mass is a significant subsurface heat source for ice melt. We analyze the temperature and salinity profiles observed in late summer with a thermodynamic mixing model and determine the total freshwater content in the layer below the summer surface layer to be between 5\% and 11\%. The total freshwater contribution in this layer from melted glacial ice was estimated to be 1{\textendash}2\%, while the corresponding SgFW was estimated to be 3{\textendash}10\%. The winter measurements in the subsurface halocline layer showed a total freshwater content of about 1\% and no significant contribution from SgFW.}, keywords = {fjord, freshwater sources and their distribution, Greenland Ice Sheet, subglacial freshwater fraction model, subsurface heat sources for glacial ice melt, tidewater outlet glaciers}, issn = {2169-9291}, doi = {10.1002/jgrc.20134}, url = {http://dx.doi.org/10.1002/jgrc.20134}, author = {Mortensen, J. and Bendtsen, J. and Roman J. Motyka and Lennert, K. and Martin Truffer and Mark Fahnestock and Rysgaard, S.} } @article {123, title = {Outlet glacier response to forcing over hourly to interannual timescales, Jakobshavn Isbr{\ae}, Greenland}, journal = {Journal of Glaciology}, volume = {58}, year = {2012}, pages = {1212}, doi = {10.3189/2012JoG12J065}, author = {Podrasky, David and Martin Truffer and Mark Fahnestock and Jason M Amundson and Cassotto, Ryan and Ian Joughin} } @article {77, title = {Reconstruction of basal properties in ice sheets using iterative inverse methods}, journal = {Journal of Glaciology}, volume = {58}, year = {2012}, pages = {795{\textendash}807}, author = {Habermann, M. and Maxwell, D. and Martin Truffer} } @article {76, title = {{Using surface velocities to calculate ice thickness and bed topography: a case study at Columbia Glacier, Alaska, USA}}, journal = {Journal of Glaciology}, volume = {58}, year = {2012}, pages = {1151-1164}, doi = {10.3189/2012JoG11J249}, author = {R ~W McNabb and Regine Hock and Shad O'Neel and L ~A Rasmussen and Ahn, Y. and M Braun and H Conway and Herreid, S. and Ian Joughin and W. Tad Pfeffer and B ~E Smith and Martin Truffer} } @article {69, title = {From ice-shelf tributary to tidewater glacier: continued rapid recession, acceleration and thinning of Rohss Glacier following the 1995 collapse of the Prince Gustav Ice Shelf, Antarctic Peninsula}, journal = {Journal of Glaciology}, volume = {57}, year = {2011}, pages = {397{\textendash}406}, doi = {10.3189/002214311796905578}, url = {http://openurl.ingenta.com/content/xref?genre=article\&issn=0022-1430\&volume=57\&issue=203\&spage=397}, author = {Glasser, NF and Scambos, TA and Bohlander, J. and Martin Truffer and Erin C Pettit and Davies, BJ} } @article {60, title = {Submarine melting of the 1985 Jakobshavn Isbr{\ae} floating tongue and the triggering of the current retreat}, journal = {Journal of Geophysical Research}, volume = {116}, year = {2011}, pages = {F01007}, doi = {10.1029/2009JF001632}, author = {Roman J. Motyka and Martin Truffer and Mark Fahnestock and Mortensen, J. and Rysgaard, S. and I M Howat} } @article {44, title = {Glacier microseismicity}, journal = {Geology}, volume = {38}, year = {2010}, pages = {319-322}, abstract = {We present a framework for interpreting small glacier seismic events based on data collected near the center of Bering Glacier, Alaska, in spring 2007. We find extremely high microseismicity rates (as many as tens of events per minute) occurring largely within a few kilometers of the receivers. A high-frequency class of seismicity is distinguished by dominant frequencies of 20{\textendash}35 Hz and impulsive arrivals. A low-frequency class has dominant frequencies of 6{\textendash}15 Hz, emergent onsets, and longer, more monotonic codas. A bimodal distribution of 160,000 seismic events over two months demonstrates that the classes represent two distinct populations. This is further supported by the presence of hybrid waveforms that contain elements of both event types. The high-low-hybrid paradigm is well established in volcano seismology and is demonstrated by a comparison to earthquakes from Augustine Volcano. We build on these parallels to suggest that fluid-induced resonance is likely responsible for the low-frequency glacier events and that the hybrid glacier events may be caused by the rush of water into newly opening pathways.}, doi = {10.1130/G30606.1}, url = {http://geology.gsapubs.org/content/38/4/319.abstract}, author = {West, M. and Chris F. Larsen and Martin Truffer and Shad O'Neel and LeBlanc, Laura} } @article {56, title = {Ice m{\'e}lange dynamics and implications for terminus stability, Jakobshavn Isbr{\ae}, Greenland}, journal = {Journal of Geophysical Research}, volume = {115}, year = {2010}, pages = {F01005}, doi = {10.1029/2009JF001405}, author = {Jason M Amundson and Mark Fahnestock and Martin Truffer and Brown, J. and M P L{\"u}thi and Roman J. Motyka} } @article {58, title = {A unifying framework for iceberg-calving models}, journal = {Journal of Glaciology}, volume = {56}, year = {2010}, pages = {822{\textendash}830}, url = {http://openurl.ingenta.com/content/xref?genre=article\&issn=0022-1430\&volume=56\&issue=199\&spage=822}, author = {Jason M Amundson and Martin Truffer} } @article {49, title = {Volume change of Jakobshavn Isbrae, West Greenland:: 198519972007}, journal = {Journal of Glaciology}, volume = {56}, year = {2010}, pages = {635{\textendash}646}, url = {http://openurl.ingenta.com/content/xref?genre=article\&issn=0022-1430\&volume=56\&issue=198\&spage=635}, author = {Roman J. Motyka and Mark Fahnestock and Martin Truffer} } @article {35, title = {Calving icebergs indicate a thick layer of temperate ice at the base of Jakobshavn Isbr{\ae}, Greenland}, journal = {Journal of Glaciology}, volume = {55}, year = {2009}, pages = {563{\textendash}566}, url = {http://openurl.ingenta.com/content/xref?genre=article\&issn=0022-1430\&volume=55\&issue=191\&spage=563}, author = {M P L{\"u}thi and Mark Fahnestock and Martin Truffer} } @article {39, title = {Iterative methods for solving a nonlinear boundary inverse problem in glaciology}, journal = {Journal of Inverse and Ill-posed Problems}, volume = {17}, year = {2009}, pages = {239{\textendash}258}, url = {http://www.reference-global.com/doi/abs/10.1515/JIIP.2}, author = {Avdonin, S. and Kozlov, V. and Maxwell, D. and Martin Truffer} } @article {40, title = {A method to estimate the ice volume and ice-thickness distribution of alpine glaciers}, journal = {Journal of Glaciology}, volume = {55}, year = {2009}, pages = {422{\textendash}430}, url = {http://openurl.ingenta.com/content/xref?genre=article\&issn=0022-1430\&volume=55\&issue=191\&spage=422}, author = {Farinotti, D. and Huss, M. and Bauder, A. and Funk, M. and Martin Truffer} } @article {33, title = {Terminus dynamics at an advancing glacier: Taku Glacier, Alaska}, journal = {Journal of Glaciology}, volume = {55}, year = {2009}, pages = {1052{\textendash}1060}, url = {http://openurl.ingenta.com/content/xref?genre=article\&issn=0022-1430\&volume=55\&issue=194\&spage=1052}, author = {Martin Truffer and Roman J. Motyka and Hekkers, M. and I M Howat and King, M.A.} } @article {28, title = {Continued evolution of Jakobshavn Isbrae following its rapid speedup}, journal = {J. geophys. Res}, volume = {113}, year = {2008}, pages = {F04006}, url = {http://www.agu.org/pubs/crossref/2008/2008JF001023.shtml}, author = {Ian Joughin and I M Howat and Mark Fahnestock and B ~E Smith and Krabill, W. and Alley, R.B. and Stern, H. and Martin Truffer} } @article {31, title = {Correspondence: Another surge of Variegated Glacier, Alaska, USA, 2003/04}, journal = {Journal of Glaciology}, volume = {54}, year = {2008}, pages = {192-200}, doi = {doi:10.3189/002214308784409134}, url = {http://www.ingentaconnect.com/content/igsoc/jog/2008/00000054/00000184/art00019}, author = {Harrison, W. and Roman J. Motyka and Martin Truffer} } @article {32, title = {Glacier, fjord, and seismic response to recent large calving events, Jakobshavn Isbr{\ae}, Greenland}, journal = {Geophysical Research Letters}, volume = {35}, year = {2008}, pages = {L22501}, url = {http://www.agu.org/pubs/crossref/2008/2008GL035281.shtml}, author = {Jason M Amundson and Martin Truffer and M P L{\"u}thi and Mark Fahnestock and West, M. and Roman J. Motyka} } @article {17, title = {Glacier Recession on Heard Island, Southern Indian Ocean}, journal = {Arctic, Antarctic, and Alpine Research}, volume = {40}, year = {2008}, pages = {199{\textendash}214}, url = {http://www.bioone.org/doi/abs/10.1657/1523-0430(06-084)\%5BTHOST\%5D2.0.CO;2}, author = {Thost, D.E. and Martin Truffer} } @article {29, title = {Ice-front variation and tidewater behavior on Helheim and Kangerdlugssuaq Glaciers, Greenland}, journal = {Journal of Geophysical Research}, volume = {113}, year = {2008}, pages = {F01004}, url = {http://www.agu.org/pubs/crossref/2008/2007JF000837.shtml}, author = {Ian Joughin and I M Howat and Alley, R.B. and Ekstrom, G. and Mark Fahnestock and Moon, T. and Nettles, M. and Martin Truffer and Tsai, V.C.} } @article {24, title = {An iterative scheme for determining glacier velocities and stresses}, journal = {Journal of Glaciology}, volume = {54}, year = {2008}, pages = {888{\textendash}898}, url = {http://openurl.ingenta.com/content/xref?genre=article\&issn=0022-1430\&volume=54\&issue=188\&spage=888}, author = {Maxwell, D. and Martin Truffer and Avdonin, S. and Stuefer, M.} } @article {20, title = {Seasonal fluctuations in the advance of a tidewater glacier and potential causes: Hubbard Glacier, Alaska, USA}, journal = {Journal of Glaciology}, volume = {54}, year = {2008}, pages = {401{\textendash}411}, url = {http://openurl.ingenta.com/content/xref?genre=article\&issn=0022-1430\&volume=54\&issue=186\&spage=401}, author = {Ritchie, J.B. and C S Lingle and Roman J. Motyka and Martin Truffer} } @article {27, title = {Seasonality of snow accumulation at Mount Wrangell, Alaska, USA}, journal = {Journal of Glaciology}, volume = {54}, year = {2008}, pages = {273{\textendash}278}, url = {http://www.ingentaconnect.com/content/igsoc/jog/2008/00000054/00000185/art00008}, author = {Kanamori, S. and Benson, C.S. and Martin Truffer and Matoba, S. and Solie, D.J. and Shiraiwa, T.} } @article {15, title = {Flotation and retreat of a lake-calving terminus, Mendenhall Glacier, southeast Alaska, USA}, journal = {Journal of Glaciology}, volume = {53}, year = {2007}, pages = {211{\textendash}224}, author = {Boyce, E.S. and Roman J. Motyka and Martin Truffer} } @article {16, title = {Glaciervolcano interactions in the North Crater of Mt Wrangell, Alaska}, journal = {Annals of Glaciology}, volume = {45}, year = {2007}, pages = {48{\textendash}57}, author = {Benson, C.S. and Roman J. Motyka and McNUTT, S. and M P L{\"u}thi and Martin Truffer} } @article {5, title = {Hubbard Glacier, Alaska: 2002 closure and outburst of Russell Fjord and postflood conditions at Gilbert Point}, journal = {Journal of geophysical research}, volume = {112}, year = {2007}, pages = {F02004}, author = {Roman J. Motyka and Martin Truffer} } @article {3, title = {Rethinking ice sheet time scales}, journal = {Science}, volume = {315}, year = {2007}, pages = {1508{\textendash}1510}, doi = {10.1126/science.11404}, author = {Martin Truffer and Mark Fahnestock} }