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Seasonal deuterium excess in a Tien Shan ice core: Influence of moisture transport and recycling in Central Asia

Geophysical Research Letters

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Abstract

Stable water isotope (??18O, ??D) data from a high elevation (5100 masl) ice core recovered from the Tien Shan Mountains, Kyrgyzstan, display a seasonal cycle in deuterium excess (d = ??D - 8*??18O) related to changes in the regional hydrologic cycle during 1994-2000. While there is a strong correlation (r2 = 0.98) between ??18O and ??D in the ice core samples, the regression slope (6.9) and mean d value (23.0) are significantly different than the global meteoric water line values. The resulting time-series ice core d profile contains distinct winter maxima and summer minima, with a yearly d amplitude of ???15-20???. Local-scale processes that may affect d values preserved in the ice core are not consistent with the observed seasonal variability. Data from Central Asian monitoring sites in the Global Network of Isotopes in Precipitation (GNIP) have similar seasonal d changes. We suggest that regional-scale hydrological conditions, including seasonal changes in moisture source, transport, and recycling in the Caspian/Aral Sea region, are responsible for the observed spatial and temporal d variability.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Seasonal deuterium excess in a Tien Shan ice core: Influence of moisture transport and recycling in Central Asia
Series title:
Geophysical Research Letters
Volume
30
Issue:
18
Year Published:
2003
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article