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Deep‐water renewal in Lake Issyk‐Kul
Author(s) -
Vollmer Martin K.,
Weiss Ray F.,
Schlosser Peter,
Williams Robert T.
Publication year - 2002
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2002gl014763
Subject(s) - nitrate , environmental science , silicate , carbon dioxide , oxygen , deep water , atmospheric sciences , geology , chemistry , oceanography , organic chemistry
The deep‐water renewal rates of Lake Issyk‐Kul are studied using the time‐dependent anthropogenically produced tracers sulfur hexafluoride (SF 6 ), chlorofluorocarbons (CFCs) and tritium‐helium‐3. SF 6 and the CFCs are used to calibrate a mixing model from which the vertical age distribution is calculated and found to be comparable to the SF 6 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.