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

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

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30rclm2k&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 18, pp. CLM 2-1, CiteID 1922, DOI 10.1029/2003GL017896

Mathematics

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3

Global Change: Climate Dynamics (3309), Global Change: Water Cycles (1836), Geochemistry: Isotopic Composition/Chemistry, Hydrology: Glaciology (1863)

Scientific paper

Stable water isotope (δ18O, δD) data from a high elevation (5100 masl) ice core recovered from the Tien Shan Mountains, Kyrgyzstan, display a seasonal cycle in deuterium excess (d = δD - 8*δ18O) related to changes in the regional hydrologic cycle during 1994-2000. While there is a strong correlation (r2 = 0.98) between δ18O and δD 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.

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