The TIC d18O derived from downcore sediments effectively parallels the anthropogenic lake-level lowering (Figure 2). The anthropogenically induced drought is recorded in downcore sediments as a 6% increase in TIC d18O. During the El Nin?o years of 1982?83 and 1997?98, Walker Lake (like Pyramid Lake) received well above average moisture. The lake volume increased by 28% from its September 1981 value and the d18OL decreased 3.6% during the 1982?83 event [Benson et al., 1991]. This climate-induced wet event was well recorded in downcore sediments as a 3% decrease in TIC d18O (Figures 2b and 2c)

Year AD - based on linear model in Yuan et al. (2004)

A 1200 year record of hydrologic variability in the Sierra Nevada from sediments in Walker Lake, Nevada

Yuan, F., Linsley, B. K., Lund, S. P. and McGeehin, J. P.: A 1200 year record of hydrologic variability in the Sierra Nevada from sediments in Walker Lake, Nevada, Geochemistry, Geophysics, Geosystems, 5(3), doi:10.1029/2003gc000652, 2004.

d18O (LS04YUWA): interpretation4_scope: '' has been replaced by 'isotope'
CaCO3 (WEBa4c9285c): interpretation1_scope: '' has been replaced by 'isotope'
CaCO3 (WEBa4c9285c): interpretation2_scope: '' has been replaced by 'isotope'
CaCO3 (WEBa4c9285c): interpretation3_scope: '' has been replaced by 'isotope'
TIC (WEBbfa46c07): interpretation1_scope: '' has been replaced by 'isotope'
TIC (WEBbfa46c07): interpretation2_scope: '' has been replaced by 'isotope'
TIC (WEBbfa46c07): interpretation3_scope: '' has been replaced by 'isotope'
d13C (WEBedf590e2): interpretation1_scope: '' has been replaced by 'isotope'
d13C (WEBedf590e2): interpretation2_scope: '' has been replaced by 'isotope'
d13C (WEBedf590e2): interpretation3_scope: '' has been replaced by 'isotope'

Kiel automated device for isotope ratio mass spectrometry on a Finnigan Delta XLfor isotope ratio mass spectrometry on a Finnigan Delta XL

Jellybean is an evaporation-insensitive lake; The d18O of Jellybean Lake water (average 20.4 ) was identical to mean annual precipitation ( 20.4 ). We conclude that multi-annual y18 Op variation in this region is not driven by temperature changes alone. We suggest that temporal changes in atmospheric circulation across the St. Elias Mountains are the major control on the oxygen isotope composition of precipitation in the interior of the southern Yukon and hence hydrologically open lakes such as Jellybean.