Temperature Control on Silicate Weathering Intensity and Evolution of the Neogene East Asian Summer Monsoon

Xueping Ren, Junsheng Nie, Joel E. Saylor, Xiaoxue Wang, Fangbin Liu, Brian K. Horton

Research output: Contribution to journalArticle

Abstract

Accurately reconstructing the evolution of the Asian monsoon is predicated on understanding the impact of temperature, precipitation, and tectonic paleogeography on silicate weathering proxies over million year timescales. We find that decreasing trends in chemical weathering proxies in both the northern and southern Tibetan Plateau match those from benthic oxygen isotope and sea surface temperature stacks since the late Miocene. In contrast, a synthesis of magnetic parameter-based records and marine clastic flux records reveals stronger monsoon precipitation during both the warm middle Miocene and cool late Miocene, supporting model simulations showing that both paleogeography and atmospheric CO2 content are important in controlling the summer monsoon. This trend of increasing monsoon precipitation contrasts with the record of decreasing chemical weathering, suggesting that chemical weathering proxies are mainly regulated by temperature at million year timescales, rather than precipitation. These findings clarify reconstructions of the Cenozoic evolution of the East Asian summer monsoon.

Original languageEnglish (US)
Article numbere2020GL088808
JournalGeophysical Research Letters
Volume47
Issue number15
DOIs
StatePublished - Aug 16 2020
Externally publishedYes

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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