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Meromixis in hypersaline Mono Lake, California. 3. Biogeochemical response to stratification and overturn
Author(s) -
Miller Laurence G.,
Jellison Robert,
Oremland Ronald S.,
Culbertson Charles W.
Publication year - 1993
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1993.38.5.1040
Subject(s) - chemocline , anoxic waters , methane , hypolimnion , biogeochemical cycle , sulfide , water column , environmental chemistry , epilimnion , chemistry , geology , oceanography , eutrophication , organic chemistry , nutrient
Mono Lake is a terminal, saline lake that became ectogenically meromictic in 1982–1983 and remained stratified until November 1988. During this period, the monimolimnion remained anoxic and nearly isothermal, while the upper mixolimnion was well oxygenated and exhibited a seasonal thermal regime. Dissolved sulfide and methane increased in the monimolimnion as a result of diffusive flux from the sediments. Winter mixing down to the chemocline distributed sulfide and methane throughout the mixolimnion. Lakewide inventories of dissolved sulfide and methane reflected the balance between increased concentrations and decreased monimolimnion volume over time. At overturn, the entire water column was isothermal and anoxic. Dissolved sulfide (380 × 10 6 mol) was oxidized in 1 week by molecular oxygen. Methane (12 × 10 6 mol) was removed more slowly by microbial oxidation and ventilation across the air‐water interface.