Tracing calcite precipitation with specific conductance in a hard water alpine lake (Lake Bourget) - Archive ouverte HAL Access content directly
Journal Articles Water Research Year : 2000

Tracing calcite precipitation with specific conductance in a hard water alpine lake (Lake Bourget)

(1) , (1) , (1) , (1) ,
1

Abstract

The authors discuss the reliability of a new method used to depict precisely the authigenic calcite precipitation process in the water column of a mesotrophic alpine lake (Lake Bourget, Savoie, France). Complete chemical analysis of dissolved major elements shows that, in the epilimnion, calcium concentration and alkalinity are the only chemical species presenting large variations. The behaviour of these two parameters is only related to calcite precipitation. The method is based on in situ specific conductance measurements (C-25). Experimental values were compared with theoretical calculations. The results demonstrate clearly that dissolved calcium concentration can be directly related to measured specific conductance. Hence, a mathematical relationship was developed to compute calcium concentration profiles in the water column with a centimetre spatial resolution through the whole water column. Finally, authigenic calcite production can be observed and quantified on a time scale covering two years or experimental data. Calcite production is estimated to 4.8 mol m(-2) yr(-1). Extrapolation to the whole lake surface leads to 16.000 +/- 2000 tons yr(-1) as CaCO3. specific conductance is an easy-to-measure in situ parameter which could be used to trace authigenic calcite production in other hard water alpine lakes. (C) 2000 Elsevier Science Ltd. All rights reserved.
Fichier principal
Vignette du fichier
Groleau2000.pdf (325.32 Ko) Télécharger le fichier
Origin : Files produced by the author(s)
Loading...

Dates and versions

hal-00711823 , version 1 (29-03-2015)

Identifiers

Cite

A. Groleau, G Sarazin, Brigitte Vinçon-Leite, Bruno Tassin, C. Quiblier-Lloberas. Tracing calcite precipitation with specific conductance in a hard water alpine lake (Lake Bourget). Water Research, 2000, 34 (17), pp.4151--4160. ⟨10.1016/S0043-1354(00)00191-3⟩. ⟨hal-00711823⟩
108 View
311 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More