Holocene variations in the Asian monsoon inferred from the geochemistry of lake sediments in central Tibet

Carrie Morrill, Jonathan Overpeck, Julia Cole, Kam Biu Liu, Caiming Shen, Lingyu Tang

Research output: Contribution to journalArticle

157 Citations (Scopus)

Abstract

We present a record of monsoon variations for the early and middle Holocene that is inferred from the geochemistry of sediment cores from Ahung Co, a lake in central Tibet. The resolution of this record is better than 50 yr and the age model is derived from radiocarbon ages of terrestrial charcoal, which eliminates errors associated with the lake hard-water effect. We made down-core geochemical measurements of % carbonate, % organic carbon, C/N and δ13C of bulk organic matter, δ13C and δ18O of carbonate, and % dolomite. Proxy calibration and modern water-balance reconstruction show that these are proxies for lake depth and the amount of monsoon precipitation. We find that lake level and monsoon precipitation have been decreasing at Ahung Co since the early Holocene (∼7500 cal yr B.P.). Superimposed on this trend are rapid declines in monsoon rainfall at 7000-7500 and 4700 cal yr B.P. and seven century-scale wet - dry oscillations. The cores do not contain sediment from the last ∼4000 yr. Surface sediments from the lake accumulated during the 20th century, however. From this, we argue that lake levels have risen again recently following a late Holocene dry period.

Original languageEnglish (US)
Pages (from-to)232-243
Number of pages12
JournalQuaternary Research
Volume65
Issue number2
DOIs
StatePublished - Mar 2006

Fingerprint

lacustrine deposit
monsoon
geochemistry
Holocene
lake
lake level
carbonate
charcoal
sediment
sediment core
dolomite
water budget
organic carbon
oscillation
calibration
organic matter
rainfall
Geochemistry
Sediment
Asia

Keywords

  • Aquatic macrophytes
  • Climate change
  • Hard-water effect
  • Holocene
  • Monsoon
  • Oxygen stable isotopes
  • Paleoclimate
  • Precipitation

ASJC Scopus subject areas

  • Earth-Surface Processes
  • Earth and Planetary Sciences(all)

Cite this

Holocene variations in the Asian monsoon inferred from the geochemistry of lake sediments in central Tibet. / Morrill, Carrie; Overpeck, Jonathan; Cole, Julia; Liu, Kam Biu; Shen, Caiming; Tang, Lingyu.

In: Quaternary Research, Vol. 65, No. 2, 03.2006, p. 232-243.

Research output: Contribution to journalArticle

Morrill, Carrie ; Overpeck, Jonathan ; Cole, Julia ; Liu, Kam Biu ; Shen, Caiming ; Tang, Lingyu. / Holocene variations in the Asian monsoon inferred from the geochemistry of lake sediments in central Tibet. In: Quaternary Research. 2006 ; Vol. 65, No. 2. pp. 232-243.
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