Understanding clouds and precipitation over the Mount Qomolangma: how does the aerosol activation effect exist?

Area of Science:

• Atmospheric Science
• Cloud Physics
• Climate Science

Background:

• Mount Qomolangma (MQ), the "Roof of the World," offers a unique high-altitude environment.
• Understanding aerosol-cloud interactions is crucial for climate modeling and weather prediction.

Purpose of the Study:

• To investigate the activation effect of aerosols on cloud-precipitation processes at MQ.
• To explore the role of aerosols in modulating precipitation patterns on MQ's slopes.

Main Methods:

• Vertical observations of aerosols, clouds, and precipitation at MQ.
• Integration of dual-radar active remote sensing with precipitation observation.
• Analysis of observational data during the Indian summer monsoon.

Main Results:

• South Asian aerosols significantly activate cloud-precipitation processes over MQ.
• Increased aerosols inhibit weak precipitation but intensify cloud development, leading to heavy precipitation on the north slope.
• Aerosol effects, combined with MQ's thermal-dynamic mechanisms, trigger deep convection and alter precipitation frequency on MQ's slopes.

Conclusions:

• Aerosol activation effect plays a critical role in modulating precipitation intensity and distribution on MQ.
• Interannual variations show decreased light rain and increased moderate to heavy precipitation on the north slope.
• The findings highlight differentiated precipitation changes on MQ's south and north slopes due to aerosol activation.