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Modeling Precipitation Patterns in Hyperarid Soils Atacama Desert, Chile Kari Finstad EPS 209 - Spring 2011 Atacama Among driest Desert places on Earth Hyperarid climate since Pliocene Large surficial deposits of salts What

  1. Modeling Precipitation Patterns in Hyperarid Soils Atacama Desert, Chile Kari Finstad EPS 209 - Spring 2011

  2. Atacama ✴ Among driest Desert places on Earth ✴ Hyperarid climate since Pliocene ✴ Large surficial deposits of salts

  3. What precipitation pattern can explain observed deposition depth trend? SO4 (gypsum) layers on top NaCl (halite) below

  4. Annual Salt Deposition NaCl CaSO4

  5. Precipitation event NaCl CaSO4

  6. Dissolution of salts H2O + NaCl CaSO4

  7. Downward movement of salt saturated water H2O + NaCl H2O + CaSO4

  8. Deposition of salt as soil dries out H2O H2O NaCl CaSO4

  9. RESULTS Frequent ‘small’ Infrequent ‘moderate’ events events = = CaSO4 CaSO4 NaCl NaCl

  10. Conclusion The Atacama Desert has experienced a period of hyperaridty punctuated with brief infrequent episodes of rainfall that are larger than the long term average

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