A lowering of lake level by 0.5m would turn the lake into a topographically closed basin. Under such conditions, evaporation becomes the main  process of water loss, and lake-water continues to become 18Oenriched  until d18O of the evaporating vapor equals d18O of the input (Gat and Levy, 1978; Leng and Marshall, 2004). In contrast, a more positive water balance than the present is expected to  shorten the lake?s water-residence time, reducing the influence of evaporation on the lake?s isotope composition (Craig, 1961). Thus  the d18OCc record can be used to infer qualitative changes in  effective moisture.

we employed the model developed by Bowen and Wilkinson (2002) and Bowen and Revenaugh (2003) to estimate the isotope composition of monthly precipitation atTakahula Lake.

We calculated a regional meteoric water line (RMWL) from
 precipitation dD and d18O data from Global Network of Isotopes in
 Precipitation (GNIP) (IAEA/WMO, 2004) sites in Bethel (60 4604800
 N, 161 4800000 W), Barrow (71 1800000 N, 156 4604800 W), Mayo
 (63 2201200 N, 135 3101200 W), and Whitehorse (60 4301200 N,
 135 401200 W)'

age (MAT178924c724): interpretation5_scope: '' has been replaced by 'climate'
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