Stabilisation of geodetic points in the surroundings of Johann Gregor Mendel Station, James Ross Island, Antarctica

Stachoň, Zdeněk; Russnák, Jan; Nývlt, Daniel; Hrbáček, Filip

doi:10.5817/cpr2014-1-9

Cited by 6 publications

(5 citation statements)

References 14 publications

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“…Wind-transported mineral grains during episodic summer storm events can be >1 mm. However, medium and fine sand predominates in accumulations on snowfields and ice or on the lee sides of elevations (Davies et al 2013, Stachoň et al 2014). Wind flow may, on the contrary, represent a limiting factor for colonization since it mechanically disturbs the skin surface on windward sites.…”

Section: Interpretation and Discussionmentioning

confidence: 99%

Death age, seasonality, taphonomy and colonization of seal carcasses from Ulu Peninsula, James Ross Island, Antarctic Peninsula

et al. 2015

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Abstract:The origin and nature of seal carcasses scattered around the Ulu Peninsula, James Ross Island, is examined using robust and novel multidisciplinary analysis. Spatial distribution analysis indicates their predominance at low elevations and on surfaces with negligible slope. The seals died throughout the last century. Dental cement increments indicate that the seals died in late winter, and we interpret this to show an influence of the persistence and break-up of sea ice and the appearance of pools/cracks in the northern Prince Gustav Channel on death. Specifically, after being trapped by a late winter freeze-up the seals search for open water, become disoriented by snow-covered flat valleys and move inland. Carcasses from all age groups of crabeater seal are found on land, but inland movement is less notable for Weddell and leopard seals. Although most carcasses appear to have remained unchanged during the last 10 years due to the cold and dry conditions, a few carcasses that are located in sites of snow accumulation and subsequent melting have undergone enhanced decay. Decaying seal carcasses represent loci of nutrient release in a nutrient deficient environment and are colonized by algae, cyanobacteria, lichens and mosses. This research suggests further useful studies for the future.

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Section: Interpretation and Discussionmentioning

confidence: 99%

Death age, seasonality, taphonomy and colonization of seal carcasses from Ulu Peninsula, James Ross Island, Antarctic Peninsula

et al. 2015

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“…Permafrost in the northern part of JRI can approach 95 m in thickness and the ALT is highly variable, ranging from 22 to 150 cm (Borzotta and Trombotto, 2004;Engel et al, 2010;Bockheim et al, 2013). The study site is located on a Holocene marine terrace ( Figure 2) formed by beach deposits composed of gravelly sand (Stachoň et al, 2014).…”

Section: Regional Settingsmentioning

confidence: 99%

Effect of Snow Cover on the Active‐Layer Thermal Regime – A Case Study from James Ross Island, Antarctic Peninsula

Hrbáček

Láska

Engel

2015

Permafrost & Periglacial

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The response of active‐layer thickness and the ground thermal regime to climatic conditions on the Ulu Peninsula (James Ross Island, northeastern Antarctic Peninsula) in 2011–13 is presented. The mean air temperature over this period was –8.0°C and ground temperature at 5 cm depth varied from –6.4°C (2011–12) to –6.7°C (2012–13). The active‐layer thickness ranged between 58 cm (January 2012) and 52 cm (February 2013). Correlation analyses indicate that air temperature affects ground temperature more significantly on snow‐free days (R2 = 0.82) than on snow cover days (R2 = 0.53). Although the effect of snow cover on the daily amplitude of ground temperature was observable to 20 cm depth, the overall influence of snow depth on ground temperature was negligible (freezing n‐factor of 0.95–0.97). Copyright © 2015 John Wiley & Sons, Ltd.

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“…The presence of less-consolidated hyaloclastite tuffs, volcanic ash, lapillistone and volcaniclastic sandstones to conglomerates (Nehyba and Nývlt, 2014) of the Bibby Hill volcanic cone represent an easily mechanically eroding material, which is blown away by prevailing S-E winds being subsequently deposited as wind-blown silty sands (Davies et al, 2013;Stacho et al, 2014) on snowpatches, directly in moist places of the Bohemian Stream valley, or filling deep gorges (Figure 2) of right obsequent tributaries of Bohemian Stream.…”

Section: Ssc and Ssymentioning

confidence: 99%

Seasonal hydrological and suspended sediment transport dynamics in proglacial streams, James Ross Island, Antarctica

Kavan

Ondruch

Nývlt

et al. 2016

Geografiska Annaler: Series A, Physical Geography

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Rapid warming of the Antarctic Peninsula is producing accelerated glacier mass loss and can be expected to have significant impacts on meltwater runoff regimes and proglacial fluvial activity. This study presents analysis of the hydrology and suspended sediment dynamics of two proglacial streams on James Ross Island, Antarctic Peninsula. Mean water discharge during 8/1/2015 to 18/2/2015 reached 0.19 m 3 s -1 and 0.06 m 3 s -1 for Bohemian Stream and Algal Stream, respectively, equivalent to specific runoff of 76 mm month -1 and 60 mm month -1 . The daily discharge regime strongly correlated with air and ground temperatures. The effect of global radiation on proglacial water discharge was found low to negligible. Suspended sediment concentrations of Bohemian Stream were very high (up to 2927 mg L -1 ) due to aeolian supply and due to the high erodibility of local rocks. Total sediment yield (186 t km -2 yr -1 ) was high for (nearly) deglaciated catchments, but relatively low in comparison with streams draining more glaciated alpine and arctic catchments. The sediment provenance was mostly local Cretaceous marine and aeolian sediments; volcanic rocks are not an important source for suspended load. High Rb/Sr ratios for some samples suggested chemical weathering. Overall, this monitoring of proglacial hydrological and suspended sediment dynamics contributes to the dearth of such data from Antarctic environments and offers an insight to the nature of the proglacial fluvial activity, which is likely to be in a transient state with ongoing climate change.

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Stabilisation of geodetic points in the surroundings of Johann Gregor Mendel Station, James Ross Island, Antarctica

Cited by 6 publications

References 14 publications

Death age, seasonality, taphonomy and colonization of seal carcasses from Ulu Peninsula, James Ross Island, Antarctic Peninsula

Death age, seasonality, taphonomy and colonization of seal carcasses from Ulu Peninsula, James Ross Island, Antarctic Peninsula

Effect of Snow Cover on the Active‐Layer Thermal Regime – A Case Study from James Ross Island, Antarctic Peninsula

Seasonal hydrological and suspended sediment transport dynamics in proglacial streams, James Ross Island, Antarctica

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