Seasonal variability of methane in the rivers and lagoons of Ivory Coast (West Africa)

Kone, Y. J. M.; Abril, G.; Delille, Bruno; Borges, Alberto

doi:10.1007/s10533-009-9402-0

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Seasonal variability of methane in the rivers and lagoons of Ivory Coast (West Africa)

Kone, Y. J. M.; Abril, G.; Delille, Bruno et al.

2010 • In Biogeochemistry, 100 (1-3), p. 21-37

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10.1007/s10533-009-9402-0

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Keywords :

Methane; Lagoons; Rivers; Ivory Coast

Abstract :

[en] We report a data-set of dissolved methane (CH4) in three rivers (Como,, Bia and Tano,) and five lagoons (Grand-Lahou, Ebri,, Potou, Aby and Tendo) of Ivory Coast (West Africa), during the four main climatic seasons (high dry season, high rainy season, low dry season and low rainy season). The surface waters of the three rivers were over-saturated in CH4 with respect to atmospheric equilibrium (2221-38719%), and the seasonal variability of CH4 seemed to be largely controlled by dilution during the flooding period. The strong correlation of CH4 concentrations with the partial pressure of CO2 (pCO(2)) and dissolved silicate (DSi) confirm the dominance of a continental sources (from soils) for both CO2 and CH4 in these rivers. Diffusive air-water CH4 fluxes ranged between 25 and 1187 mu mol m(-2) day(-1), and annual integrated values were 288 +/- A 107, 155 +/- A 38, and 241 +/- A 91 mu mol m(-2) day(-1) in the Como,, Bia and Tano, rivers, respectively. In the five lagoons, surface waters were also over-saturated in CH4 (ranging from 1496 to 51843%). Diffusive air-water CH4 fluxes ranged between 20 and 2403 mu mol m(-2) day(-1), and annual integrated values were 78 +/- A 34, 338 +/- A 217, 227 +/- A 79, 330 +/- A 153 and 326 +/- A 181 mu mol m(-2) day(-1) in the Grand-Lahou, Ebri,, Potou, Aby and Tendo lagoons, respectively. The largest CH4 over-saturations were observed in the Tendo and Aby lagoons that are permanently stratified systems (unlike the other three lagoons), leading to anoxic bottom waters favorable for a large CH4 production. In addition, these two stratified lagoons showed low pCO(2) values due to high primary production, which suggests an efficient transfer of organic matter across the pycnocline. As a result, the stratified Tendo and Aby lagoons were respectively, a low source of CO2 to the atmosphere and a sink of atmospheric CO2 while the other three well-mixed lagoons were strong sources of CO2 to the atmosphere but less over-saturated in CH4.

Disciplines :

Environmental sciences & ecology
Physical, chemical, mathematical & earth Sciences: Multidisciplinary, general & others

Author, co-author :

Kone, Y. J. M.

Abril, G.

Delille, Bruno ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Océanographie chimique

Borges, Alberto ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Océanographie chimique

Language :

English

Title :

Seasonal variability of methane in the rivers and lagoons of Ivory Coast (West Africa)

Publication date :

2010

Journal title :

Biogeochemistry

ISSN :

0168-2563

eISSN :

1573-515X

Publisher :

Springer Science & Business Media B.V., Dordrecht, Netherlands

Volume :

100

Issue :

1-3

Pages :

21-37

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 28 September 2010

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