Radioglaciological studies on Hurd Peninsula glaciers, Livingston Island, Antarctica

Navarro, Francisco; Otero, Jaime; Macheret, Yu. Ya.; Vasilenko, E.V.; Lapazaran, Javier; Ahlstrøm, Andreas P.; Machío, Francisco

doi:10.3189/172756409789097603

Cited by 37 publications

(67 citation statements)

References 16 publications

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“…snow, firn, ice, or water) sampled along the profile (e.g. Jania and others, 2005;Navarro and others, 2009). From the above discussion, uncertainties in RWV could be expected to lie between ∼ 1 and 5% (i.e.…”

Section: Error In Rwvmentioning

confidence: 99%

On the errors involved in ice-thickness estimates I: ground-penetrating radar measurement errors

et al. 2016

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ABSTRACT. This is the first (Paper I) of three companion papers focused respectively, on the estimates of the errors in ice thickness retrieved from pulsed ground-penetrating radar (GPR) data, on how to estimate the errors at the grid points of an ice-thickness DEM, and on how the latter errors, plus the boundary delineation errors, affect the ice-volume estimates. We here present a comprehensive analysis of the various errors involved in the computation of ice thickness from pulsed GPR data, assuming they have been properly migrated. We split the ice-thickness error into independent components that can be estimated separately. We consider, among others, the effects of the errors in radio-wave velocity and timing. A novel aspect is the estimate of the error in thickness due to the uncertainty in horizontal positioning of the GPR measurements, based on the local thickness gradient. Another novel contribution is the estimate of the horizontal positioning error of the GPR measurements due to the velocity of the GPR system while profiling, and the periods of GPS refreshing and GPR triggering. Their effects are particularly important for airborne profiling. We illustrate our methodology through a case study of Werenskioldbreen, Svalbard.

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Section: Error In Rwvmentioning

confidence: 99%

On the errors involved in ice-thickness estimates I: ground-penetrating radar measurement errors

et al. 2016

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“…Typical slopes for Johnsons glacier range between 10 • in its northern areas and 6 • in the southern ones. The average ice thickness of the ice cap, determined from groundpenetrating radar data in 2000/2001, was 93.6 ± 2.5 m, with maximum values about 200 m in the accumulation area of Hurd glacier (Navarro et al, 2009). The ice surface velocities of Johnsons glacier increase downstream from the ice divide, reaching annual-averaged values up to 65 m a −1 at the fastest part of the calving front (Otero et al, 2010), while the largest ice velocities for Hurd glacier are typically about 5 m a −1 (Otero, 2008) to one standard deviation.…”

Section: Physical Settingmentioning

confidence: 99%

“…This is explained by lower accumulation rates on Hurd glacier attributed to snow redistribution by wind, together with slightly higher ablation rates, due to Hurd's hypsometry, which shows a much larger share of area at the lowermost altitudes (<100 m) as compared to Johnsons . The Hurd Peninsula ice cap is a polythermal ice mass, showing an upper layer of cold ice, several tens of metres thick, in the ablation area (Molina et al, 2007;Navarro et al, 2009). The cold layer is rather uniform in Hurd glacier while in Johnsons glacier the layer is more patchy.…”

Section: Physical Settingmentioning

confidence: 99%

Sensitivity of a distributed temperature-radiation index melt model based on AWS observations and surface energy balance fluxes, Hurd Peninsula glaciers, Livingston Island, Antarctica

Jonsell

Navarro²,

Bañón

et al. 2012

The Cryosphere

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Abstract. We use an automatic weather station and surface mass balance dataset spanning four melt seasons collected on Hurd Peninsula Glaciers, South Shetland Islands, to investigate the point surface energy balance, to determine the absolute and relative contribution of the various energy fluxes acting on the glacier surface and to estimate the sensitivity of melt to ambient temperature changes. Long-wave incoming radiation is the main energy source for melt, while short-wave radiation is the most important flux controlling the variation of both seasonal and daily mean surface energy balance. Short-wave and long-wave radiation fluxes do, in general, balance each other, resulting in a high correspondence between daily mean net radiation flux and available melt energy flux. We calibrate a distributed melt model driven by air temperature and an expression for the incoming short-wave radiation. The model is calibrated with the data from one of the melt seasons and validated with the data of the three remaining seasons. The model results deviate at most 140 mm w.e. from the corresponding observations using the glaciological method. The model is very sensitive to changes in ambient temperature: a 0.5 • C increase results in 56 % higher melt rates.

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“…In the snouts of Hurd Glacier (in the Sally Rocks area) and its side lobes Argentina and Las Palmas, where the glacier thickness tapers to zero, the cold ice layer extends down to bedrock so the glacier is frozen to the bed in these terminal areas, implying a compressional stress regime. In contrast, the area close to Johnsons calving front shows the extensional stress regime characteristic of the terminus of tidewater glaciers (Molina and others, 2007;Navarro and others, 2009;Otero and others, 2010).…”

Section: Introductionmentioning

confidence: 99%

Decelerated mass loss of Hurd and Johnsons Glaciers, Livingston Island, Antarctic Peninsula

Navarro¹,

Jonsell²,

Corcuera³

et al. 2013

J. Glaciol.

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Radioglaciological studies on Hurd Peninsula glaciers, Livingston Island, Antarctica

Cited by 37 publications

References 16 publications

On the errors involved in ice-thickness estimates I: ground-penetrating radar measurement errors

On the errors involved in ice-thickness estimates I: ground-penetrating radar measurement errors

Sensitivity of a distributed temperature-radiation index melt model based on AWS observations and surface energy balance fluxes, Hurd Peninsula glaciers, Livingston Island, Antarctica

Decelerated mass loss of Hurd and Johnsons Glaciers, Livingston Island, Antarctic Peninsula

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