Spatial and Temporal Variability of Glacier Surface Velocities and Outlet Areas on James Ross Island, Northern Antarctic Peninsula

Lippl, Stefan; Friedl, Peter; Kittel, Christoph; Marinsek, Sebastián; Seehaus, Thorsten; Braun, Matthias

doi:10.3390/geosciences9090374

Cited by 7 publications

(10 citation statements)

References 64 publications

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“…Details to the processing can be found in Seehaus et al [31]. Furthermore, unreliable velocity estimates, mostly near to the cliff where the standard deviation in a 21 × 21 pixel moving window is larger than 0.5 m d −1 , were excluded [23]. Velocity maps of Gourdon Glacier are available for the period August 2014 until April 2018 (Table A1) at Pangaea doi:10.1594/PANGAEA.907062.…”

Section: Estimation Of Surface Velocities From Satellite Datamentioning

confidence: 99%

“…Accumulated SMB data for the year 2017 on Gourdon Glacier were taken from the nearest grid cells in the MAR regional climate model in the version 3.9 with a spatial resolution of 7.5 km [21,22]. In Lippl et al [23], the suitability of MAR regarding the differences between the lower lying outlet glaciers and the higher elevated plateau on JRI were evaluated by in situ measurements for different climate variables. Data revealed that for temperature, surface pressure and relative humidity, MAR is able to reflect the temporal variability at the outlet glaciers with a reasonable constant bias.…”

Section: Ice Thickness Interpolation and Reconstructionmentioning

confidence: 99%

“…Data revealed that for temperature, surface pressure and relative humidity, MAR is able to reflect the temporal variability at the outlet glaciers with a reasonable constant bias. Wind data were more suspicious to possible uncertainties, which holds true probably also for precipitation/SMB [23]. Interpolation approaches like the MCRA relying on mass conservation are dependent on accurate surface mass balance data [17].…”

Section: Ice Thickness Interpolation and Reconstructionmentioning

confidence: 99%

“…is used as ∆v i in Formula (9). More details e.g., to the location of the stable areas can be found in Lippl et al [23]. The error in the velocity direction ∆α i is estimated similar to Sánchez-Gámez and Navarro [37] as the standard deviation of α j for j ∈ i − 4, i + 4.…”

Section: Surface Velocity and Directionmentioning

confidence: 99%

“…They combined outcomes of five ice thickness estimation models (for the Randolph Glacier Inventory (RGI) region 19/Antarctic and subantarctic only 1-2) to one ensemble-based "consensus ice thickness estimate" (CIE) [4,19] for each of the glaciers included in the RGI [20]. Nevertheless, peculiarities in the glacier geometry, but also local variations in the morphology of the bedrock, are still difficult to treat due to the lower resolution of input data (e.g., 7.5 km in the Modèle Atmosphérique Régional (MAR) applied in this study for the simulation of the surface mass balance (SMB) [21][22][23]). Moreover, ice cliffs exceeding several meters interrupt the continuity equations along flow lines and impose a boundary condition on the ice flux and ice thickness.…”

Section: Introductionmentioning

confidence: 99%

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Uncertainty Assessment of Ice Discharge Using GPR-Derived Ice Thickness from Gourdon Glacier, Antarctic Peninsula

et al. 2019

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Ice cliffs within a glacier represent a challenge for the continuity equations used in many glacier models by interrupting the validity of input parameters. In the case of Gourdon Glacier on James Ross Island, Antarctica, a ∼300–500 m high, almost vertical cliff, separates the outlet glacier from its main accumulation area on the plateau of the island. In 2017 and 2018 we conducted ice thickness measurements during two airborne ground penetrating radar campaigns in order to evaluate differences to older measurements from the 1990s. The observed differences are mostly smaller than the estimated error bars. In comparison to the in situ data, the published “consensus ice thickness estimate” strongly overestimates the ice thickness at the outlet. We analyse three different interpolation and ice thickness reconstruction methods. One approach additionally includes the mass input from the plateau. Differences between the interpolation methods have a minor impact on the ice discharge estimation if the used flux gates are in areas with a good coverage of in situ measurements. A much stronger influence was observed by uncertainties in the glacier velocities derived from remote sensing, especially in the direction of the velocity vector in proximity to the ice cliff. We conclude that the amount of in situ measurements should be increased for specific glacier types in order to detect biases in modeled ice thickness and ice discharge estimations.

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Section: Estimation Of Surface Velocities From Satellite Datamentioning

confidence: 99%

Section: Ice Thickness Interpolation and Reconstructionmentioning

confidence: 99%

Section: Ice Thickness Interpolation and Reconstructionmentioning

confidence: 99%

Section: Surface Velocity and Directionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Uncertainty Assessment of Ice Discharge Using GPR-Derived Ice Thickness from Gourdon Glacier, Antarctic Peninsula

et al. 2019

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Persistent mass loss of Triangular Glacier, James Ross Island, north-eastern Antarctic Peninsula

et al. 2022

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The retreat rates of Triangular Glacier since 1979 and its mass changes during the period 2014/15–2019/20 indicate the sensitive response of small ice masses on the eastern side of the Antarctic Peninsula to air temperature evolution. This cirque glacier in the northern part of James Ross Island receded rapidly during the period of regional warming in the late 20th century, losing 30.8% of its surface area between 1979 and 2006 (−1.7% a−1). The retreat rate then dropped to −0.3% a−1 following the regional cooling trend, but started to accelerate again (−0.8 to −2.3% a−1) with increasing air temperature since the summer 2014/15. Since the glaciological year 2015/16, Triangular Glacier has experienced enhanced snow melt, wind scour and permanent mass loss with annual mass balance ranging from −0.08 ± 0.35 to −0.56 ± 0.25 m w.e. The largest mass loss was observed in the glaciological year 2019/20, which included the warmest summer of the observation period. The cumulative mass balance of −1.66 ± 0.83 m w.e. over the years 2014/15–2019/20 is consistent with the termination of the positive mass-balance period that occurred in the north-eastern Antarctic Peninsula from 2009/10 to 2014/15.

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Recent change in surface mass-balance trends of glaciers on James Ross Island, north-eastern Antarctic Peninsula

Engel,

Láska,

Smolíková

et al. 2024

J. Glaciol.

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Glaciers cover 132 900 km2 around the Antarctic Ice Sheet, but few are subject to annual mass-balance measurements. Lookalike Glacier and Davies Dome on James Ross Island have been monitored since 2009, providing the third longest mass-balance record for the northern Antarctic Peninsula. These glaciers had a balanced mass budget over the period 2009/10–2014/15 but started to lose their mass thereafter. Between 2014/15 and 2020/21, mass change rates were −0.15 ± 0.13 and −0.26 ± 0.11 m w.e. a−1 for Lookalike Glacier and Davies Dome, respectively. The mean equilibrium-line altitudes over this period at Lookalike Glacier (362 ± 18 m a.s.l.) and Davies Dome (>427 ± 22 m a.s.l.) are 51 and >34 m higher compared to the previous 6-year period. The mean accumulation area ratio values determined for the period 2014/15–2020/21 are lower than the balanced-budget ratio indicating that glaciers are out of balance with the current climate. The data confirm the transition from positive to negative mass-balance periods around 2014/15, which is attributed to the change in air temperature trends. The mean summer temperature increased by 0.9°C between the periods 2009/10–2014/15 and 2015/16–2020/21 and melt-season temperatures became predominantly positive.

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Spatial and Temporal Variability of Glacier Surface Velocities and Outlet Areas on James Ross Island, Northern Antarctic Peninsula

Cited by 7 publications

References 64 publications

Uncertainty Assessment of Ice Discharge Using GPR-Derived Ice Thickness from Gourdon Glacier, Antarctic Peninsula

Uncertainty Assessment of Ice Discharge Using GPR-Derived Ice Thickness from Gourdon Glacier, Antarctic Peninsula

Persistent mass loss of Triangular Glacier, James Ross Island, north-eastern Antarctic Peninsula

Recent change in surface mass-balance trends of glaciers on James Ross Island, north-eastern Antarctic Peninsula

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