earth sci - geochemical cycles

earth sci - geochemical cycles - Earth Science...

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Earth Science – Geochemical/Biogeochemical Cycles -important to understand residence times and processes for toxic materials and nutrients (macronutrients = C, O, H, N, P, S… micronutrients = Na, Fe, Mg, Cu, Cl, I, Zn etc) -earth is a closed system for matter (therefore components must cycle) Steady State Box Models -steady state (equilibria) F in = F out -stock/(flow rate) = residence time M/F = T F in = F out = M/T Framework of Water Cycle -hydrologic cycle a good framework model for biogeochemical cycles (energy input from sun, water cycling quantity determined by precipitation rate, thus climate a key starting factor) Framework of Rock Cycle -rock cycle a good framework model for geochemical cycles (common ultimate source for matter, common ultimate sink for matter, usual source of anthropogenic sources [mining]) Phosphorous a Nutrient I mportant for life -nucleic acids -cell membranes -energy transfer systems -bones and teeth Limited Reactions of P (limitations of P) -plants assimilate P as phosphate (PO 4 3- ) and incorporate this into organic compounds -animals and phosphatizing bacteria break down organic forms of P
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earth sci - geochemical cycles - Earth Science...

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