Modeling Precipitation Patterns in Hyperarid Soils Atacama Desert, - PowerPoint PPT Presentation

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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

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 precipitation pattern can explain observed deposition depth trend? SO4 (gypsum) layers on top NaCl (halite) below
Annual Salt Deposition NaCl CaSO4
Precipitation event NaCl CaSO4
Dissolution of salts H2O + NaCl CaSO4
Downward movement of salt saturated water H2O + NaCl H2O + CaSO4
Deposition of salt as soil dries out H2O H2O NaCl CaSO4
RESULTS Frequent ‘small’ Infrequent ‘moderate’ events events = = CaSO4 CaSO4 NaCl NaCl
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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