C.P. Wake
V.B. Aizen
L. DeWayne Cecil
H.-A. Synal
K.J. Kreutz
2003
<p><span>Stable water isotope (δ</span><sup>18</sup><span>O, δD) data from </span>a<span> high elevation (5100 masl) </span>ice<span> </span>core<span> recovered from the </span>Tien<span> </span>Shan<span> Mountains, Kyrgyzstan, display </span>a<span> </span>seasonal<span> cycle </span>in<span> </span>deuterium<span> </span>excess<span> (d = δD - 8*δ</span><sup>18</sup><span>O) related to changes </span>in<span> the regional hydrologic cycle during 1994-2000. While there is </span>a<span> strong correlation (r</span><sup>2</sup><span> = 0.98) between δ</span><sup>18</sup><span>O and δD </span>in<span> the </span>ice<span> </span>core<span> 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 </span>ice<span> </span>core<span> d profile contains distinct winter maxima and summer minima, with </span>a<span> yearly d amplitude of ∼15-20‰. Local-scale processes that may affect d values preserved </span>in<span> the </span>ice<span> </span>core<span> are not consistent with the observed </span>seasonal<span> variability. Data from </span>Central<span> Asian monitoring sites </span>in<span> the Global Network of Isotopes </span>in<span> Precipitation (GNIP) have similar </span>seasonal<span> d changes. We suggest that regional-scale hydrological conditions, including </span>seasonal<span> changes </span>in<span> </span>moisture<span> source, </span>transport<span>, and </span>recycling<span> </span>in<span> the Caspian/Aral Sea region, are responsible for the observed spatial and temporal d variability.</span></p>
application/pdf
10.1029/2003GL017896
en
American Geophysical Union
Seasonal deuterium excess in a Tien Shan ice core: Influence of moisture transport and recycling in Central Asia
article