Infrared characterization of water uptake by low‐temperature Na‐montmorillonite: Implications for Earth and Mars
作者： EK Frinak , CD Mashburn , MA Tolbert , OB Toon
DOI: 10.1029/2004JD005647
关键词: Vapour pressure of water 、 Water vapor 、 Montmorillonite 、 Mineralogy 、 Analytical chemistry 、 Ammonium sulfate 、 Vapor pressure 、 Adsorption 、 Relative humidity 、 Geology 、 Troposphere
摘要: [1] A large fraction of atmospheric mineral aerosol is composed clays, such as smectites. Smectites are known to expand upon addition water, and thus their properties in the atmosphere may vary strongly with relative humidity (RH). Here we report on adsorption water Na-montmorillonite, a smectite clay. We probe uptake under conditions representative Earth's troposphere, well those relevant for surface Mars, which montmorillonite proposed component. Using vacuum chamber equipped transmission Fourier transform infrared spectroscopy, find that Na-montmorillonite contains 10% by mass at temperatures from 212 K 231 50% RH. Surprisingly, almost great deliquesced ammonium sulfate. also although depends RH, there not strong dependence absolute temperature. In addition, time required clay become saturated decreases increasing vapor pressure much shorter than suggested previous studies. discuss implications these results troposphere potential role Martian hydrologic cycle.
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