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Arcs: The Unseen Players in the Global Carbon Cycle

Are subduction zones the critical sink in the carbon cycle? This study explores underrepresented arc rivers, highlighting their high erosion rates and unique geochemistry. Investigate their potential climate sensitivity and contribution to global carbon cycling.

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Arcs: The Unseen Players in the Global Carbon 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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