Papers on Climate and Atmospheric Physics
Climatological significance of δ18O in north Tibetan ice cores
Article first published online: 21 SEP 2012
Copyright 1996 by the American Geophysical Union.
Journal of Geophysical Research: Atmospheres (1984–2012)
Volume 101, Issue D23, pages 29531–29537, 27 December 1996
How to Cite
1996), Climatological significance of δ18O in north Tibetan ice cores, J. Geophys. Res., 101(D23), 29531–29537, doi:10.1029/96JD02683., , , , , and (
- Issue published online: 21 SEP 2012
- Article first published online: 21 SEP 2012
- Manuscript Accepted: 24 JUL 1996
- Manuscript Received: 24 JUL 1995
Oxygen isotopic ratios (δ18O) of precipitation samples collected over several years at three meteorological stations on the northern Tibetan Plateau were used to conduct the first investigation of the relationship between δ18O and contemporaneous air temperatures (Ta). Inferring past temperatures from δ18O measured in recently acquired Tibetan ice cores necessitates establishing whether a δ18O-Ta relationship exists. For each station a strong temporal relationship is found between δ18O and Ta, particularly for monthly averages which remove synoptic-scale influences such as changes in condensation level, condensation temperature, and moisture sources. Moisture source is identified as a major factor in the spatial distribution of δ18O, but air temperature determines the temporal fluctuations of δ18O at individual sites on the northern Tibetan Plateau. The 30-year records of annually averaged δ18O from three different ice coring sites are not correlated significantly with contemporaneous air temperature records from their closest meteorological station (150 to 200 km). However, since 1960 the three air temperature records reveal a modest warming trend, while the three contemporaneous δ18O records show a modest 18O enrichment.