Dust deposition tracks late-Holocene shifts in monsoon activity and the increasing role of human disturbance in the Puna-Altiplano, northwest Argentina

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dc.contributor.authorHooper, Jen_AU
dc.contributor.authorMarx, SKen_AU
dc.contributor.authorMay, JHen_AU
dc.contributor.authorLupo, LCen_AU
dc.contributor.authorKulemeyer, JJen_AU
dc.contributor.authorPereira, EdlÁen_AU
dc.contributor.authorSeki, Oen_AU
dc.contributor.authorHeijnis, Hen_AU
dc.contributor.authorChild, DPen_AU
dc.contributor.authorGadd, PSen_AU
dc.contributor.authorZawadzki, Aen_AU
dc.date.accessioned2021-06-30T02:44:30Zen_AU
dc.date.available2021-06-30T02:44:30Zen_AU
dc.date.issued2020-04-01en_AU
dc.date.statistics2021-06-16en_AU
dc.description.abstractThe Puna-Altiplano plateau represents a regionally significant dust source, which is critically located at the nexus between the tropical and sub-polar synoptic systems that dominate the South American climate. Dust emissions in this region would therefore be expected to be sensitive to changes in these systems, in particular the strength and position of the South American Summer Monsoon (SASM). Here, we present a late-Holocene multi-proxy study where changes in dust flux, reconstructed from a high-altitude peat mire, are examined in light of climate variability and human impacts. Results show that for most the 4300 cal. yr BP record, dust flux sensitively tracked changes in SASM activity. Prior to 2600 cal. yr BP relatively high dust flux implies dry conditions prevailed across the Puna-Altiplao in association with reduced SASM activity. The chemistry of dust deposited at this time matched the large endorheic basins on the Puna, which host ephemeral lakes and terminal fans, indicating these were actively supplying dust to the airstream. After 2600 cal. yr BP, SASM activity increased while dust flux decreased and the dust chemistry changed, collectively implying the shutting down of the Puna-Altiplano as a significant dust source. Dust flux increased after 1000 cal. yr BP during the ‘Medieval Warm Period’, associated with a return to drier conditions and reactivation of dust sources across the endorheic basins of the Puna. Natural variability in dust flux was dwarfed, however, by the very significant increase in flux after 400 cal. yr BP following Spanish Colonisation and associated changing landuse practices. This finding attests to the globally significant role of humans on dust emissions. © 2020 by SAGE Publicationsen_AU
dc.identifier.citationHooper, J., Marx, S. K., May, J.-H., Lupo, L. C., Kulemeyer, J. J., Pereira, E. d. l. Á ., Seki, O., Heijnis, H, Child, D., Gadd, P. & Zawadzki, A. (2020). Dust deposition tracks late-Holocene shifts in monsoon activity and the increasing role of human disturbance in the Puna-Altiplano, northwest Argentina. The Holocene, 30(4), 519-536. doi:10.1177/0959683619895814en_AU
dc.identifier.issn1477-0911en_AU
dc.identifier.issue4en_AU
dc.identifier.journaltitleThe Holoceneen_AU
dc.identifier.pagination519-536en_AU
dc.identifier.urihttps://doi.org/10.1177/0959683619895814en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/10976en_AU
dc.identifier.volume30en_AU
dc.language.isoenen_AU
dc.publisherSAGEen_AU
dc.subjectDustsen_AU
dc.subjectPeaten_AU
dc.subjectLand useen_AU
dc.subjectClimatesen_AU
dc.subjectMoonsoonsen_AU
dc.subjectQuaternary perioden_AU
dc.subjectArgentinaen_AU
dc.subjectSouth Americaen_AU
dc.titleDust deposition tracks late-Holocene shifts in monsoon activity and the increasing role of human disturbance in the Puna-Altiplano, northwest Argentinaen_AU
dc.typeJournal Articleen_AU
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