【基于溶解物负荷的风化速率和CO2提取的估算】J.K. Pattanaik^a S. Balakrishnan^bR. Bhutani^bP. Singh^b. Estimation of weathering rates and CO₂drawdown based on solute load: Significance of granulites and gneisses dominated weathering in the Kaveri River basin Southern India.Geochimica et Cosmochimica ActaVolume 121 15 November 2013 Pages 611–636

Abstract

The solute load of the Kaveri River (South India) and its tributaries draining diverse Precambrian terrains during pre-monsoon and monsoon periods was determined. Using average annual flow total drainage area and atmospheric input corrected major ion concentrations of these rivers chemical weathering rates annual fluxes of different ionic species to the ocean and CO₂ consumption rates were estimated.

Bicarbonate is the most dominant ion (27–79% of anion budget) in all the river samples collected during monsoon period followed by Ca²⁺ whereas in case of pre-monsoon water samples Na⁺ is the most dominant ion (in meq-l). Two approaches were adopted to estimate silicate and carbonate weathering rates in the drainage basin. At Musuri silicate weathering rate (SWR) is 9.44 ± 0.29 tons-km²-a and carbonate weathering rate (CWR) is 1.46 ± 0.16 tons-km²-a. More than 90% of the total ionic budget is derived from weathering of silicates in the Kaveri basin.

CO₂ consumption rate in the basin for silicate weathering