Determining the spatial and temporal patterns of climate changes in China's western interior during the last 15 ka from lacustrine oxygen isotope records

Shi Yong Yu, Richard D. Ricketts, Steven M. Colman

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14 Citations (Scopus)

Abstract

China's western interior is a climatologically complex region, where climatic conditions are primarily controlled by the westerly jet stream and the Asian monsoon system. Observations reveal that the δ 18O signatures of these atmospheric elements as expressed in their meteoric waters are different, and these differences are reflected in the lacustrine systems that are ultimately fed by the meteoric waters. Empirical orthogonal function (EOF) decomposition of 17 lacustrine δ18O records from this area clearly reveals the spatial and temporal structures of climate changes during the last 15 ka. The first EOF mode, dominated by sites in the NW sector, captures the temperature effect on the variability of the δ18O dataset. We interpret the variations through time in the amplitude of this mode to be indicative of changes in summer air temperature. The second EOF mode, heavily weighted by sites in the SE sector, reveals the 'amount effect' on δ18O, and thus its amplitude time series indicates changes in the intensity of the Asian summer monsoon. Our EOF-based reconstructions of regional climate are generally consistent with the δ18O records of ice cores, cave speleothems and marine carbonates.

Original languageEnglish (US)
Pages (from-to)237-247
Number of pages11
JournalJournal of Quaternary Science
Volume24
Issue number3
DOIs
StatePublished - Jun 2 2009

Fingerprint

oxygen isotope
climate change
meteoric water
monsoon
climatic region
jet stream
speleothem
summer
ice core
temperature effect
westerly
regional climate
cave
air temperature
time series
decomposition
carbonate
empirical orthogonal function analysis
China
Oxygen Isotopes

Keywords

  • Asian monsoon
  • China's western interior
  • Empirical orthogonal function
  • Lacustrine oxygen isotope
  • Westerlies

Cite this

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AB - China's western interior is a climatologically complex region, where climatic conditions are primarily controlled by the westerly jet stream and the Asian monsoon system. Observations reveal that the δ 18O signatures of these atmospheric elements as expressed in their meteoric waters are different, and these differences are reflected in the lacustrine systems that are ultimately fed by the meteoric waters. Empirical orthogonal function (EOF) decomposition of 17 lacustrine δ18O records from this area clearly reveals the spatial and temporal structures of climate changes during the last 15 ka. The first EOF mode, dominated by sites in the NW sector, captures the temperature effect on the variability of the δ18O dataset. We interpret the variations through time in the amplitude of this mode to be indicative of changes in summer air temperature. The second EOF mode, heavily weighted by sites in the SE sector, reveals the 'amount effect' on δ18O, and thus its amplitude time series indicates changes in the intensity of the Asian summer monsoon. Our EOF-based reconstructions of regional climate are generally consistent with the δ18O records of ice cores, cave speleothems and marine carbonates.

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