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Summary: 1210 Notes
Limnol. Oceanogr., 47(4), 2002, 12101216
2002, by the American Society of Limnology and Oceanography, Inc.
Rapid deep-water renewal in Lake Issyk-Kul (Kyrgyzstan) indicated by transient tracers
Abstract--Simultaneous profiles of the transient tracers sul-
fur hexafluoride (SF6), 3
H-3
He, and the chlorofluorocarbons
CFC-11 and CFC-12 were measured in Lake Issyk-Kul, a
large, deep lake in Kyrgyzstan. Apparent water ages derived
from these measurements suggest rapid mixing, with a deep-
water renewal rate 10% yr 1
at 650 m depth. SF6 and 3
H-
3
He ages agree reasonably well, whereas CFC ages are signif-
icantly greater. The discrepancy is explained by the nonlinear
relationship between tracer age and tracer concentration and
by the flattening of the atmospheric growth curves for CFCs.
Novel to physical limnology is the application of SF6 dating,
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