What does the Bergeron process involve?

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Multiple Choice

What does the Bergeron process involve?

The Bergeron process is the growth of ice crystals in clouds that contain both ice and supercooled liquid water. In these mixed-phase clouds, water vapor pressure over ice is lower than over liquid water at the same subfreezing temperature, so water vapor tends to deposit onto ice crystals while liquid droplets evaporate. This transfers mass from the liquid droplets to the ice crystals, allowing the ice to grow while the droplets shrink. As these ice crystals become large enough, they fall and manifest as precipitation. Depending on the atmospheric temperature profile on the way down, that precipitation can appear as snow, or melt into rain, or partially refreeze into sleet or freezing rain after crossing warmer and cooler layers. Other options describe processes that don’t involve ice growth in mixed-phase clouds—such as condensation in warm air producing rain, deposition onto non-ice surfaces, or liquid water formed by coalescence—so they don’t capture the Bergeron mechanism.

The Bergeron process is the growth of ice crystals in clouds that contain both ice and supercooled liquid water. In these mixed-phase clouds, water vapor pressure over ice is lower than over liquid water at the same subfreezing temperature, so water vapor tends to deposit onto ice crystals while liquid droplets evaporate. This transfers mass from the liquid droplets to the ice crystals, allowing the ice to grow while the droplets shrink. As these ice crystals become large enough, they fall and manifest as precipitation. Depending on the atmospheric temperature profile on the way down, that precipitation can appear as snow, or melt into rain, or partially refreeze into sleet or freezing rain after crossing warmer and cooler layers.

Other options describe processes that don’t involve ice growth in mixed-phase clouds—such as condensation in warm air producing rain, deposition onto non-ice surfaces, or liquid water formed by coalescence—so they don’t capture the Bergeron mechanism.

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