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Arcs – a critical sink in the global C cycle?

Arcs – a critical sink in the global C cycle?. Underrepresented in our data and our thinking No big rivers Large groundwater fluxes (unmeasured!). Interesting features Ca, Mg rich compositions Fast kinetics in volc rocks Tectonically active Wet High erosion rates

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Arcs – a critical sink in the global C cycle?

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  1. Arcs – a critical sink in the global C cycle? • Underrepresented in our data and our thinking • No big rivers • Large groundwater fluxes (unmeasured!) • Interesting features • Ca, Mg rich compositions • Fast kinetics in volc rocks • Tectonically active • Wet • High erosion rates • Frequent resurfacing MgSiO3 + 2CO2 + 3H2O Mg++ + 2HCO3- + H4SiO4 “MgCO3” + SiO2 + CO2 net = -1 CO2 per mol Ca or Mg weathered Climate sensitivity? Milliman: sed yields are ≈10x global average

  2. Arc rivers are different …. n=74 n=156

  3. Basalt weathering shows strong climate sensitivity. (data mostly from Dessert et al., 2003) T dependence: exponent ≈ 0.08 is similar to laboratory Arrhenius rates, e.g. for labradorite. Is this too good to be true …?

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