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Enhanced cold cloud clearing by pulsed CO(2) lasers.

A P Waggoner, L F Radke

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    Laser energy effectively clears ice crystal clouds, unlike droplet clouds, due to lower saturation concentrations. Ice cloud channels resist recondensation, offering a more stable solution for atmospheric clearing applications.

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    Area of Science:

    • Atmospheric physics
    • Laser-matter interactions
    • Cloud microphysics

    Background:

    • Laser-based methods are explored for atmospheric modification.
    • Droplet clouds rapidly recondense after laser clearing, limiting effectiveness.
    • Ice crystal clouds present different physical properties influencing laser interaction.

    Purpose of the Study:

    • To compare the laser energy required for clearing ice crystal clouds versus droplet clouds.
    • To investigate the phenomenon of recondensation in cleared cloud channels.
    • To model conditions leading to channel obscuration in both cloud types.

    Main Methods:

    • Experimental determination of laser energy thresholds for channel clearing in different cloud types.
    • Analysis of water vapor saturation concentrations over liquid water and ice.
    • Development of a physical model to simulate recondensation dynamics.

    Main Results:

    • Significantly lower laser energy input is required to clear ice crystal clouds compared to droplet clouds.
    • Ice particle clouds exhibit greater resistance to recondensation after laser-induced clearing.
    • The difference in saturation concentrations over liquid water and ice is the primary factor for this disparity.

    Conclusions:

    • Clearing ice crystal clouds with lasers is more energy-efficient and stable than clearing droplet clouds.
    • Laser-induced channels in ice clouds are less prone to rapid obscuration by recondensation.
    • Understanding saturation concentration differences is key to optimizing laser-based cloud modification techniques.