A5063482959- Cryospheric studies and observations
- Climate change and permafrost
- Landslides and related hazards
- Winter Sports Injuries and Performance
- Arctic and Antarctic ice dynamics
- Methane Hydrates and Related Phenomena
- Satellite Image Processing and Photogrammetry
- Geological Studies and Exploration
- Meteorological Phenomena and Simulations
- Geology and Paleoclimatology Research
- Remote Sensing and LiDAR Applications
- Animal Vocal Communication and Behavior
- Atmospheric aerosols and clouds
- Indigenous Studies and Ecology
- Soil erosion and sediment transport
- Animal Behavior and Reproduction
- Hydrology and Watershed Management Studies
- Marine and Coastal Research
- Fire effects on ecosystems
- Plant Water Relations and Carbon Dynamics
- Geological formations and processes
- Atmospheric and Environmental Gas Dynamics
- Plant responses to water stress
- Primate Behavior and Ecology
- Arctic and Russian Policy Studies
University of Lethbridge
2013-2025
Charles River Laboratories (Netherlands)
2015-2016
Swansea University
2003
University of Wales
2003
University of Calgary
2002-2003
University of Leeds
1998-2003
During the 1990s, Monacobreen, a 40‐km‐long tidewater glacier in Svalbard, underwent major surge. We mapped surge dynamics using ERS synthetic aperture radar images, differential dual‐azimuth interferometry and intensity correlation tracking. A series of 11 three‐dimensional (3‐D) velocity maps covering period 1991–1997 show months‐long initiation years‐long termination to surge, with no indication front travelling downglacier. advanced ∼2 km, derived strain rate increased by more than an...
Abstract We analyzed the possible controls on distribution of surge-type glaciers in Svalbard using multivariate logit models including 504 and a large number glacial geological attributes. Specifically we examined potential effect boundaries, mass-balance conditions thermal regime surging. It was found that long with relatively steep slopes overlying young fine-grained sedimentary lithologies orientations broad arc clockwise from northwest to southeast are most likely be surge type. No...
Abstract In the Northern Hemisphere, ~1500 glaciers, accounting for 28% of glacierized area outside Greenland Ice Sheet, terminate in ocean. Glacier mass loss at their ice-ocean interface, known as frontal ablation, has not yet been comprehensively quantified. Here, we estimate decadal ablation from measurements ice discharge and terminus position change 2000 to 2020. We bias-correct cross-validate estimates uncertainties using independent sources. Frontal marine-terminating glaciers...
Bakaninbreen, southern Svalbard, began a prolonged surge during 1985. In 1986, an internal reflecting horizon on radio echo sounding data was interpreted to show that the position of front coincided with transition between areas warm (unfrozen) and cold (frozen) bed. Ground‐penetrating radar lines run in 1996 1998 early quiescence basal region glacier is characterized by strong reflection, as top thick layer sediment‐rich ice. Down present front, features imaged beneath reflection are bottom...
Abstract We compiled a detailed glacier inventory of 176 glaciers in the Clemenceau Icefield Group (CIG) and adjacent Chaba (CH), Canada, based on 2001 Landsat 7 2000–03 ASTER satellite imagery Natural Resources Canada digital elevation models. used this to measure length mass-balance changes their possible controls. A classification hypsometry form hypsometric index was assess sensitivity different systems unit rise snowline. The altitude AAR steady-state ELAs derived using several methods,...
Abstract In Greenland, 87% of the glacierized area terminates in ocean, but mass lost at ice‐ocean interface, or frontal ablation, has not yet been fully quantified. Using measurements and models we calculate ablation Greenland's 213 outlet 537 peripheral glaciers find a total 481.8 ± 24.0 for 2000–2010 510.2 18.6 Gt −1 2010–2020. Ice discharge accounted ∼90% during both periods, while loss due to terminus retreat comprised remainder. Only 16 were responsible majority (>50%) from 2010...
Abstract We introduce a new glacier inventory of central East Greenland and use the collected data to test proposed theories on surging. The contains 259 glaciers, which 10 have observed surges further 61 are inferred surge-type. total glaciated area is 5.5×10 3 km 2 . was created from combination remote-sensing maps, some 24 glacial geological parameters were for each glacier. A multivariate logistic analysis used environmental conducive surging behaviour in Greenland. Three different...
Generalized linear modelling (GLM) is a statistical technique used to model the relation between response variable and set of explanatory variables. GLM similar well known multiple regression. However, powerful for exploratory data analysis with many advantages over more traditional techniques. For example, allows incorporation categorical as continuous variables in analysis. In this paper, explained two examples application geomorphology are given. The first example involves glacier surging...
Abstract. A map of Greenland in the 13th edition (2011) Times Comprehensive Atlas World made headlines because publisher's media release mistakenly stated that permanent ice cover had shrunk 15% since previous 10th (1999) revision. The claimed shrinkage was immediately challenged by glaciologists, then retracted publisher. Here we show: (1) accurate maps extent based on 1978/87 aerial surveys and recent MODIS imagery; (2) at 0.019% a−1 ~50 000 km2 a part east is shown as ice-free Atlas.
Abstract In order to assess glacier runoff the Upper Columbia River Basin (UCRB) and quantify energy balance effects of tributary‐trunk detachment due recession, we used field observations develop a distributed melt model Shackleton Glacier, Canadian Rockies. Field data were derived from meteorological stations, ablation snowline measurements, weather between 2004 2010. Katabatic wind speed direction linked terrain heat advection irradiance, potentially resulting in significant cross‐glacier...
Abstract Summer 2000/01 ASTER and Landsat 7 scenes semi-automated digitization were used to compile a glacier inventory for local glaciers of the Geikie Plateau region, central East Greenland. Of 332 (41 591 km 2 ), 120 are tidewater-terminating drain 90% glacierized area. Differencing tidewater margins from 1980s GEUS map database ice polygons (113 glaciers) 2004/05 (78 shows cumulative terminus width decrease 196 183 between 2000s, with corresponding areal loss ~31 an effective length...
ABSTRACT Donjek Glacier has an unusually short and regular surge cycle, with eight surges identified since 1935 from aerial photographs satellite imagery a ~12 year repeat interval ~2 active phase. Recent occurred during period of long-term negative mass balance cumulative terminus retreat 2.5 km 1874. In contrast to previous work, we find that the constriction where valley narrows bedrock lithology changes, 21 terminus, represents upper limit surging, negligible surface speed or elevation...
Clusters of surge-type glaciers occur in many areas peripheral to the Greenland ice sheet (Weidick, 1988). In East (68–72° N), 30–70% are surge type, but only five these have been described (Jiskoot and others, 2003, references therein). Regional characteristics dynamics used suggest a hydrologically controlled mechanism, with behaviour that is more Alaskan-type than Svalbard-type this region 2001, 2003; Murray 2002, Pritchard 2005).
Speckle-tracking of historically acquired ALOS PALSAR and RADARSAT-2 datasets are used to determine the dynamics major glaciers ice masses in western Canada over past decade. For icefields St. Elias Mountains those that fringe northern British Columbia/Alaska border, our results largely consistent with earlier studies same data, but different speckle-tracking techniques, derive motion. However, generally more spatially comprehensive than previously published, particular fast-flowing regions...
Abstract We present temperature inversion characteristics during fog and nonfog conditions at three east Greenland coastal weather stations Arctic melt seasons 1980–2016. For this purpose, we developed a novel automated method to extract fog‐top height (FTH) from Integrated Global Radiosonde Archive data, which is applicable any thermodynamic profile includes an improved interpolation of saturation between sounding levels. From the analysis >22,000 melt‐season soundings conclude that...
Cottonwoods, riparian poplars, are dioecious and prior studies have indicated that female poplars willows can be more abundant than males in low-elevation zones, which occasionally flooded. We investigated the response to flooding of clonal saplings 12 male 9 narrowleaf cottonwoods (Populus angustifolia) grown for 15 weeks a greenhouse, along with three females co-occurring native hybrid × jackii = Populus deltoides balsamifera). Three water-level treatments were provided, substrate...
Abstract A rhomboidal shaped rockslide with a length of 2·2 km and an area 1·35 2 covers 30% small Clemenceau Icefield Group cirque glacier. By means remote sensing, airborne photography, climate seismic data analysis, the extent, timing, possible trigger mechanisms, effects on glacier are discussed. An ML 2·0 event 14 September 2000 represents has spindle‐shaped waveform high energy in low frequencies. Based strong signal duration 56–108 seconds had average runout velocity 22–45 m s −1 ....
Links between climate and glacier surges are poorly understood but required to enable prediction of mitigation associated hazards. Here, we investigate the role snow accumulation, rain, temperature on surge periodicity, area changes, timing initiation since 1930s at Donjek Glacier, Yukon, Canada. Snow accumulation measured in three ice cores collected Eclipse Icefield indicates that a cumulative 15.5 ± 1.46 or 16.6 2.0 m w.e. occurred ten twelve years each its last eight surges, depending...
Abstract Sortebræ is a surge-type tidewater glacier complex draining southeastward from the Geikie Plateau, East Greenland. Sortebræ’s main flow unit surged around 1950 and again between 1992 1995. The 1990s surge affected lower 50 km of over an area approximately 335 2 . Over period <1 year front advanced >5 km. Surge velocities in order kilometres per annum are about 100-fold quiescent velocities. Multi-model photogrammetric analysis shows thinning reservoir zone up to 219 m...