Unveiling Atmospheric Layers: Vertical Pollution Patterns and Prospects for High-Resolution Aerosol Retrievals Using...

Area of Science:

• Atmospheric Science
• Environmental Science
• Air Quality Research

Background:

• Aerosol vertical distribution is crucial for air quality, radiative forcing, and atmospheric dynamics.
• The Eastern Mediterranean experiences complex aerosol mixtures, including marine, anthropogenic, and dust aerosols.
• Understanding aerosol layering is vital for accurate climate modeling and pollution management.

Purpose of the Study:

• To identify and characterize distinct aerosol vertical layering conditions in the Eastern Mediterranean.
• To link pollution types to their transport origins using back-trajectory analysis.
• To evaluate satellite-derived aerosol optical depth biases under different aerosol conditions.

Main Methods:

• Air mass back-trajectory clustering at 700 m and 1700 m above ground level.
• Analysis of aerosol mixing states and vertical layering structures.
• Random Forest modeling to predict pollution layering types.
• Evaluation of satellite-derived aerosol optical depth biases.

Main Results:

• Ten distinct aerosol layering conditions were identified, ranging from single-source to complex multi-component mixtures.
• Satellite-derived aerosol optical depth showed high accuracy during dust events but significant biases with marine-anthropogenic mixtures.
• Anthropogenic pollution content demonstrably increases with altitude across all identified layering types.
• Back-trajectory analysis linked specific pollution types to distinct transport origins.

Conclusions:

• Aerosol vertical distribution in the Eastern Mediterranean is complex, with increasing anthropogenic influence at higher altitudes.
• Accurate characterization of aerosol layers is essential for improving climate predictions and air quality management.
• The findings support projections of a strengthening Persian Trough and its influence on regional pollution patterns.