Dust and temperature influences on glaciofluvial sediment deposition in southwestern Tibet during the last millennium

Jessica L. Conroy, Jonathan Overpeck, Julia Cole, Kam Biu Liu, Luo Wang, Mihai N Ducea

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Dust over the Himalayas and southern Tibetan Plateau may influence high-elevation temperature and hydrology across Asia, but little is known about long-term dust variability and its relationship with regional climate over the last millennium. Here we have reconstructed a proxy record of past dust and temperature impacts on glacial streamflow and sediment deposition in Kiang Co, a small lake on the southwestern Tibetan Plateau. Terrigenous elemental variability in the Kiang Co sediment record, a proxy for glaciofluvial sediment deposition in the lake, covaries with the Dasuopu ice core dust record from the central Himalayas on centennial timescales. The relationship between the Kiang Co sediment record and Dasuopu indicates coherent dust forcing across the central Himalayas over much of the last millennium, and suggests that regional dustiness influences glacial streamflow and sediment transport on centennial timescales. In addition, the Kiang Co terrigenous elemental abundance record is positively correlated with May-September temperatures from the Tibetan Plateau to central India from 1870 to 2007. AD, highlighting the important influence of temperature on melting and streamflow in this region, as well as a relationship between dust and temperature on centennial timescales. These findings strengthen the likelihood of future dustiness with continued warming, along with further increases in melting and high-elevation streamflow in coming decades.

Original languageEnglish (US)
Pages (from-to)132-144
Number of pages13
JournalGlobal and Planetary Change
Volume107
DOIs
StatePublished - Aug 2013

Fingerprint

glaciofluvial deposit
dust
streamflow
temperature
plateau
timescale
melting
sediment
lake
ice core
regional climate
sediment transport
hydrology
warming

Keywords

  • Dust
  • Himalayas
  • Lake sediment
  • Paleoclimate
  • Temperature
  • Tibet

ASJC Scopus subject areas

  • Global and Planetary Change
  • Oceanography

Cite this

Dust and temperature influences on glaciofluvial sediment deposition in southwestern Tibet during the last millennium. / Conroy, Jessica L.; Overpeck, Jonathan; Cole, Julia; Liu, Kam Biu; Wang, Luo; Ducea, Mihai N.

In: Global and Planetary Change, Vol. 107, 08.2013, p. 132-144.

Research output: Contribution to journalArticle

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AU - Ducea, Mihai N

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