SIO40lecture12

SIO40lecture12 - SIO 40 Life and Climate on Earth Monday...

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SIO 40 – Life and Climate on Earth Monday Oct. 25, 2010 Lecture 12 – Carbon Cycle Part II – Inorganic carbon Wollastonite, a calcium silicate mineral Calcite crystals
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Lecture Outline Ocean-atmosphere exchange of CO 2 - The solubility pump -Chemical weathering and the carbonate-silicate geochemical cycle CO 2 CO 2 dissolved CO 2 weathering CO 2
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The solubility pump CO 2 is more soluble in cold, saline waters. Sequestration of CO 2 in the deep ocean is controlled by deep water formation – ie. the formation of cold dense water masses at high latitudes, which sink into the deep ocean taking atmospheric CO 2 with them. CO 2 is prevented from re-equilibration with the atmosphere by a cap of overlying lighter, warmer water. Re-equilibration can only occur when deep waters upwell at the surface. Carbon exchange between the ocean and atmosphere: In addition to the biological carbon pump, the inorganic solubility pump brings CO 2 into the deep ocean. CO 2 more soluble in cold seawater
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McKinley et al, GBC 2004 The combination of the biological pump and the solubility pump determines the overall air-sea flux of CO 2 – blue areas are where CO 2 is being taken up by the ocean from the atmosphere (high latitudes where deep water forms, cooling boundary currents). Red areas are where CO 2 is being outgassed from the ocean to the atmosphere (where high-CO 2 deep water upwells to the surface eg. equatorial Pacific, also coastal upwelling locations). Visualizing the solubility pump in the modern ocean
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Carbonate-silicate cycle – 1 st step is weathering CaCO 3 + H 2 CO 3 Ca 2+ + 2HCO 3 - limestone carbonic calcium bicarbonate acid ion ion CaSiO 3 + 2H 2 CO 3 Ca 2+
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This note was uploaded on 05/02/2011 for the course SIO 40 taught by Professor Barbeau,k during the Fall '08 term at UCSD.

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SIO40lecture12 - SIO 40 Life and Climate on Earth Monday...

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