Ocean Carbon abstract

data table with results presented in this paper [PDF][PS]

Geophys. Res. Lett., 2002, 29, 10.1029/2002GL014763

Deep water renewal in Lake Issyk-Kul

Martin K. Vollmer¹, Ray F. Weiss¹, Peter Schlosser,², Robert T. Williams¹

¹Scripps Institution of Oceanography, University of California at San Diego La Jolla, California, 92093-0244, USA
² Lamont-Doherty Earth Observatory, University of Columbia, Palisades, New York, 10964, USA

Abstract

The deep-water renewal rates of Lake Issyk-Kul are studied using the time-dependent anthropogenically produced tracers sulfur hexafluoride (SF₆), chlorofluorocarbons (CFCs) and tritium-helium-3. SF₆ and the CFCs are used to calibrate a mixing model from which the vertical age distribution is calculated and found to be comparable the the SF₆ apparent ages. Based on this model, the mean age of the water below 100 m depth is 6.1 yrs. The mean oxygen consumption rate for the same depth range is 6.4 µmol kg^-1 yr ^-1 and the mean remineralization rates for nitrate, phosphate and silicate are 0.53, 0.003 and 0.67 µmol kg^-1 yr ^-1, respectively.