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Title: Contemporary glacigenic inputs to the dust cycle
Authors: Bullard, Joanna E.
Keywords: Glacierised landscape
Dust cycle
Ice retreat
Dust deposition
Issue Date: 2012
Publisher: © John Wiley and Sons Ltd.
Citation: BULLARD, J.E., 2012. Contemporary glacigenic inputs to the dust cycle. Earth Surface Processes and Landforms, 38 (1), pp. 71 - 89.
Abstract: The importance of glacigenic dust in the Earth's system during glacial periods is widely acknowledged. Under contemporary conditions, the world's largest dust sources are in low-lying, hot, arid regions and this is where most aeolian research is focused. However the processes of dust production and emissions are still operating in cold climate regions, particularly in proglacial areas. This paper assesses current understanding of the relationship between glacierised landscapes and dust emissions and inputs to the global dust cycle. It focuses on how elements in the glacial and aeolian geomorphic sub-systems interact to determine the magnitude, frequency and timing of aeolian dust emissions, and on feedback mechanisms between the systems. Where they have been measured, dust emission intensity and deposition rates in glacierised catchments are very high, in some cases far exceeding those in lower latitudes, however, few studies span long time scales. The impact of future glacier retreat on the balance between sediment supply, availability and aeolian transport capacity and implications for glacigenic dust emissions is also considered. This balance depends on relative spatial and temporal changes in meltwater suspended sediment concentration and wind strengths, which promote dust emissions, and patterns and rates of soil development and vegetation succession on recently-deglaciated terrain which protect sediments from deflation. Retreat of the Antarctic ice sheet could mean that in future glacigenic contributions to the dust cycle exceed those of non-glacigenic sources in the southern hemisphere.
Description: Closed access. This article was published in the journal, Earth Surface Processes and Landforms [© John Wiley & Sons, Ltd.] and the definitive version is available on open access on the publisher's website at: http://dx.doi.org/10.1002/esp.3315
Version: Accepted for publication
DOI: 10.1002/esp.3315
URI: https://dspace.lboro.ac.uk/2134/11246
Publisher Link: http://dx.doi.org/10.1002/esp.3315
ISSN: 0197-9337
Appears in Collections:Closed Access (Geography and Environment)

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