Surface elevation changes on Lachman Crags ice caps (north-eastern Antarctic Peninsula) since 1979 indicated by DEMs and ICESat data

Engel, Zbyněk; Kropáček, Jan; Smolíková, Jana

doi:10.1017/jog.2019.19

Cited by 6 publications

(4 citation statements)

References 52 publications

(71 reference statements)

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“…Extent of glaciers in 1988 after Davies and others (2012). Data for Davies Dome, Whisky Glacier and Lachman Crags adopted from Engel and others (2012, 2019). …”

Section: Resultsmentioning

confidence: 99%

“…The error in thickness retrieved from the GPR measurement was evaluated using a conservative estimate of vertical resolution (a half of the signal's wavelength in ice, i.e. 1.68 m for the 50 MHz antenna) and a relative error in radio-wave velocity of 2.4%, which corresponds to a range of velocity values from 166 to 170 m μs –1 (Engel and others, 2019). We chose this narrow range since we anticipated only minor variations in density and water/air content in glacier ice.…”

Section: Methodsmentioning

confidence: 99%

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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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“…Extent of glaciers in 1988 after Davies and others (2012). Data for Davies Dome, Whisky Glacier and Lachman Crags adopted from Engel and others (2012, 2019). …”

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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

et al. 2022

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“…The local landscape is dominated by volcanic mesas with steep slopes reaching up to 641 m a.s.l. [40,42] and the tower-like Lookalike Peaks (767 m a.s.l.) above the southern part of the Whisky Glacier (Figure 1c).…”

Section: Experimental Setup 21 Study Areamentioning

confidence: 99%

“…In this study area, several automatic weather stations (AWS) have been installed as part of the Czech Antarctic Research Programme within the last 10 years. The AWS are located in the complex terrain of northern James Ross Island, which is characterized by low-lying coastal areas with vegetation on only a small proportion of the surfaces, hills and mesas several hundred meters high and small glaciers [39,40].…”

Section: Introductionmentioning

confidence: 99%

High-Resolution Numerical Modelling of Near-Surface Atmospheric Fields in the Complex Terrain of James Ross Island, Antarctic Peninsula

et al. 2021

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The Antarctic Peninsula belongs to the regions of the Earth that have seen the highest increase in air temperature in the past few decades. The warming is reflected in degradation of the cryospheric system. The impact of climate variability and interactions between the atmosphere and the cryosphere can be studied using numerical atmospheric models. In this study, the standard version of the Weather Research and Forecasting (WRF) model was validated on James Ross Island in the northern part of the Antarctic Peninsula. The aim of this study was to verify the WRF model output at 700 m horizontal resolution using air temperature, wind speed and wind direction observations from automatic weather stations on the Ulu Peninsula, the northernmost part of James Ross Island. Validation was carried out for two contrasting periods (summer and winter) in 2019/2020 to assess possible seasonal effects on model accuracy. Simulated air temperatures were in very good agreement with measurements (mean bias −1.7 °C to 1.4 °C). The exception was a strong air temperature inversion during two of the winter days when a significant positive bias occurred at the coastal and lower-altitude locations on the Ulu Peninsula. Further analysis of the WRF estimates showed a good skill in simulating near-surface wind speed with higher correlation coefficients in winter (0.81–0.93) than in summer (0.41–0.59). However, bias and RMSE for wind speed tended to be better in summer. The performance of three WRF boundary layer schemes (MYJ, MYNN, QNSE) was further evaluated. The QNSE scheme was generally more accurate than MYNN and MYJ, but the differences were quite small and varied with time and place. The MYNN and QNSE schemes tended to achieve better wind speed simulation quality than the MYJ scheme. The model successfully captured wind direction, showing only slight differences to the observed values. It was shown that at lower altitudes the performance of the model can vary greatly with time. The model results were more accurate during high wind speed southwestern flow, while the accuracy decreased under weak synoptic-scale forcing, accompanied by an occurrence of mesoscale atmospheric processes.

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High-resolution sub-canopy topography mapping via TanDEM-X DEM combined with future P-band BIOMASS PolInSAR data

Zhu,

Liu,

et al. 2023

J Geod

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Surface elevation changes on Lachman Crags ice caps (north-eastern Antarctic Peninsula) since 1979 indicated by DEMs and ICESat data

Cited by 6 publications

References 52 publications

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

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

High-Resolution Numerical Modelling of Near-Surface Atmospheric Fields in the Complex Terrain of James Ross Island, Antarctic Peninsula

High-resolution sub-canopy topography mapping via TanDEM-X DEM combined with future P-band BIOMASS PolInSAR data

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