Study on chemical weathering and consumption of CO2 during dry season in the Yarlung Zangbo River Basin
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Abstract:
Based o n t he surface runoff, spring w ater, g r oundwater, and pr ecipitatio n samples obtained in the dry seaso n from the main t ributaries o f Yarlung Zangbo River basin, the main ions, pH , TDS and CO2 co nsumpt ion wer e analyzed. The hy dr ochemi2 cal char act eristics and causes w ere studied. T he chemical w eathering r ate and CO2 co nsumption flux in the basin w ere also ana2 lyzed. The results indicated that t he basin water w as mild alkaline as a who le. The mean T DS of surface runoff was appro x i2 mately 21 3 times compared t o the wo rldcs rivers. It w as similar to the Yang tze River Basin but far below the Yellow River Ba2 sin. Rock weathering was the main facto r affecting the ion sour ce of surface runoff. Carbonate weathering , silicate w eathering and evapor at e w eathering acco unted for 461 3% , 281 6% , and 211 3% o f the io n so ur ces, respect ively. The carbonate w eathering rate and silicate rat es w ere 11 43 t/ ( km2. a) , and 11 11 t/ ( km2 . a) , the correspo nding CO2 co nsumpt ion r ates wer e 01 80 @ 105 mol/ ( km2 . a) and 01 55 @ 105 mol/ ( km2 . a) , w hile the chemical w eathering and CO2 consumptio n r ates w ere found lower in dry season.
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