Resilience of the Asian atmospheric circulation shown by Paleogene dust provenance
AffiliationUniv Arizona, Dept Geosci
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PublisherNATURE PUBLISHING GROUP
CitationResilience of the Asian atmospheric circulation shown by Paleogene dust provenance 2016, 7:12390 Nature Communications
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AbstractThe onset of modern central Asian atmospheric circulation is traditionally linked to the interplay of surface uplift of the Mongolian and Tibetan-Himalayan orogens, retreat of the Paratethys sea from central Asia and Cenozoic global cooling. Although the role of these players has not yet been unravelled, the vast dust deposits of central China support the presence of arid conditions and modern atmospheric pathways for the last 25 million years (Myr). Here, we present provenance data from older (42-33 Myr) dust deposits, at a time when the Tibetan Plateau was less developed, the Paratethys sea still present in central Asia and atmospheric pCO(2) much higher. Our results show that dust sources and near-surface atmospheric circulation have changed little since at least 42 Myr. Our findings indicate that the locus of central Asian high pressures and concurrent aridity is a resilient feature only modulated by mountain building, global cooling and sea retreat.
VersionFinal published version
SponsorsUniversity of Kansas; E.U. horizon project ; A. von Humboldt foundation; FP7 CIG grant ; Horizon ERC grant ; University of Arizona; NSF [AGS-1203427, AGS-1203973]
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