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High Latitude Dust Deposition in Snow on the Glaciers of James Ross Island, Antarctica

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KAVAN Jan NÝVLT Daniel LÁSKA Kamil ENGEL Zbyněk KŇAŽKOVÁ Michaela

Rok publikování 2020
Druh Článek v odborném periodiku
Časopis / Zdroj Earth Surface Processes and Landforms
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
www https://onlinelibrary.wiley.com/doi/abs/10.1002/esp.4831
Doi http://dx.doi.org/10.1002/esp.4831
Klíčová slova glaciers; high-latitude dust deposition; snow pit; James Ross Island; Antarctic Peninsula; long-range transport
Popis High-latitude dust (HLD) depositions on four glaciers of James Ross Island (the Ulu Peninsula) were analysed. The deposition rate on the selected glaciers varies from 11.8 to 64.0 g m(-2), which is one order of magnitude higher compared to the glaciers in Antarctica or elsewhere in the world. A strong negative relationship between the sediment amount and altitude of a sampling site was found. This is most likely caused by the higher availability of aeolian material in the atmospheric boundary layer. General southerly and south-westerly wind directions over the Ulu Peninsula - with exceptions based on local terrain configuration - help to explain the significantly lower level of sediment deposition on San Jose Glacier and the high level on Triangular Glacier. X-ray fluorescence (XRF) spectrophotometry was used to estimate the relative proportions of the main and trace (lithophile) elements in the sediment samples. Both the sediment amount and the XRF results are analysed in a depth profile at each locality and compared among the glaciers, suggesting long-range transport of fine mineral material from outside James Ross Island. The distribution of aeolian sediment among the glaciers corresponds well with the prevailing wind direction on the Ulu Peninsula.
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