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Six years of change in Lake Nyos, Cameroon, yield clues to the past and cautions for the future

Geochemical Journal

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, , , , ,

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Abstract

The release of gas in 1986 caused substantial mixing of the stratified water column. After the event rainfall and inflow brought dilute fluid into the surface layer. Inflow and surface mixing have gradually deepened the chemocline. The TDS values in the upper 40 m of the water column have dropped from a few hundred mg/kg just after the release to <100 mg/kg. The chemocline is strongest at 50 m depth; 5 m below this TDS = 570 mg/kg. From 55 to 150 m is a gentle gradient in which TDS reaches 920 mg/kg. Little change in water-column chemistry has occurred in this depth interval since the release. Between 150 m depth and lake bottom at 210 m depth, a strong secondary chemocline has formed. Temperature, CO2 concentration and TDS have all increased in the deepest layer in response to recharge by warm, mineralized water, reaching values of 25??C, 320 mmol/kg, and 1800 mg/kg, respectively, 1 m above lake bottom. Considering all these changes in part as a "recovery' process, it is possible to construct a model of the pre-release water column. -from Authors

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Six years of change in Lake Nyos, Cameroon, yield clues to the past and cautions for the future
Series title:
Geochemical Journal
Volume
28
Issue:
3
Year Published:
1994
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geochemical Journal
First page:
139
Last page:
162
Number of Pages:
24