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Holocene dust deposition rates in Australia’s Murray-Darling Basin record the interplay between aridity and the position of the mid-latitude westerlies

Journal Article


Abstract


  • Millennial scale variability in the strength/position of the mid-latitude westerlies, as interpreted from rates of dust deposition in an alpine mire south-eastern Australia, is demonstrated to be a major driver of climate variability during the mid to late Holocene. Dust deposition rates were calculated with a trace element provenance model. This approach is capable of distinguishing between sedimentation of local alluvium and genuine deposition of aeolian dust into the studied mire. Low dust deposition from 6500 to 5500 cal. BP occurred during a period of enhanced south-westerly winds which advected moisture into south-eastern Australia resulting in wet conditions. A subsequent dust pulse at 5500-4000 cal. BP is interpreted as a relaxation in south-westerlies resulting in a more arid phase and possibly enhanced climate variability. Reduced dust deposition between 4000 and 2000 cal. BP indicates a return to increased precipitation/moisture in the lower MDB associated with increased south-westerly geostrophic flow. The onset of more arid conditions after 2000 cal. BP implies a reduction in the frequency of precipitation bearing south-westerly winds. A final further significant finding from this study is the identification of a major dust deposition/wind erosion episode coinciding with the onset of European land clearing and agriculture in Australia. © 2011 Elsevier Ltd.

Authors


  •   Marx, Sam K.
  •   Kamber, Balz S. (external author)
  •   McGowan, Hamish A. (external author)
  •   Denholm, John (external author)

Publication Date


  • 2011

Citation


  • Marx, S. K., Kamber, B. S., McGowan, H. A. & Denholm, J. (2011). Holocene dust deposition rates in Australia’s Murray-Darling Basin record the interplay between aridity and the position of the mid-latitude westerlies. Quaternary Science Reviews, 30 (23-24), 3290-3305.

Scopus Eid


  • 2-s2.0-82555191006

Ro Metadata Url


  • http://ro.uow.edu.au/scipapers/5299

Has Global Citation Frequency


Number Of Pages


  • 15

Start Page


  • 3290

End Page


  • 3305

Volume


  • 30

Issue


  • 23-24

Abstract


  • Millennial scale variability in the strength/position of the mid-latitude westerlies, as interpreted from rates of dust deposition in an alpine mire south-eastern Australia, is demonstrated to be a major driver of climate variability during the mid to late Holocene. Dust deposition rates were calculated with a trace element provenance model. This approach is capable of distinguishing between sedimentation of local alluvium and genuine deposition of aeolian dust into the studied mire. Low dust deposition from 6500 to 5500 cal. BP occurred during a period of enhanced south-westerly winds which advected moisture into south-eastern Australia resulting in wet conditions. A subsequent dust pulse at 5500-4000 cal. BP is interpreted as a relaxation in south-westerlies resulting in a more arid phase and possibly enhanced climate variability. Reduced dust deposition between 4000 and 2000 cal. BP indicates a return to increased precipitation/moisture in the lower MDB associated with increased south-westerly geostrophic flow. The onset of more arid conditions after 2000 cal. BP implies a reduction in the frequency of precipitation bearing south-westerly winds. A final further significant finding from this study is the identification of a major dust deposition/wind erosion episode coinciding with the onset of European land clearing and agriculture in Australia. © 2011 Elsevier Ltd.

Authors


  •   Marx, Sam K.
  •   Kamber, Balz S. (external author)
  •   McGowan, Hamish A. (external author)
  •   Denholm, John (external author)

Publication Date


  • 2011

Citation


  • Marx, S. K., Kamber, B. S., McGowan, H. A. & Denholm, J. (2011). Holocene dust deposition rates in Australia’s Murray-Darling Basin record the interplay between aridity and the position of the mid-latitude westerlies. Quaternary Science Reviews, 30 (23-24), 3290-3305.

Scopus Eid


  • 2-s2.0-82555191006

Ro Metadata Url


  • http://ro.uow.edu.au/scipapers/5299

Has Global Citation Frequency


Number Of Pages


  • 15

Start Page


  • 3290

End Page


  • 3305

Volume


  • 30

Issue


  • 23-24