12:00 PM - 12:15 PM
[ACC28-12] Direct observation of elementary steps and quasi-liquid layers on ice surfaces by advanced optical microscopy
Keywords:Ice, Surface melting, Quasi-liquid layer, Molecular step, Advanced optical microscopy
On the other hand, we could also visualize the quasi-liquid layers (QLLs) on ice crystal surfaces , which are covered with thin liquid layers even below the melting point (0°C). The direct observations of QLLs revealed the appearance of two types of QLLs with different morphologies [5,6], the appearance temperatures and partial pressure of water vapor [6-8], the inducement of the formation of QLLs by strain , and the characteristic velocities of QLLs .
In addition, we also found that atmospheric acidic gas (hydrogen chloride gas) strongly induced the appearances of droplets on ice surfaces (further details will be presented in "A-AS06: Atmospheric Chemistry" session). The droplets were observed in the temperature range of -15.0 ~ -1.5°C, where no QLL appears in the absence of HCl gas . The HCl induced droplets were embedded into ice crystals by growth of ice crystals . These results show the possibility that ice crystals can store large amount of gas components as fluid inclusions.
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