Dry Deposition of Ozone over Land: Processes, Measurement, and Modeling.

Area of Science:

• Atmospheric chemistry, ecology, and meteorology.
• Environmental science and air quality research.

Background:

• Ozone dry deposition is a key sink for near-surface ozone.
• Ozone uptake by plants can injure vegetation, affecting water and carbon cycles and crop yields.
• Accurate quantification of stomatal and nonstomatal ozone uptake is vital for assessing its impact on human health and climate.

Purpose of the Study:

• To synthesize current knowledge on ozone dry deposition pathways.
• To critically review measurement and modeling methods for ozone deposition.
• To identify knowledge gaps, particularly regarding spatiotemporal variability in nonstomatal deposition.

Main Methods:

• Integration of research from atmospheric chemistry, ecology, and meteorology.
• Critical review of existing measurement and modeling techniques.
• Synthesis of knowledge on deposition pathways, including soil and leaf cuticles.

Main Results:

• Identified significant knowledge gaps in understanding nonstomatal ozone deposition variability.
• Revealed process understanding of soil and leaf cuticle deposition not present in current models.
• Highlighted the empiricism in current modeling approaches and its impact on observation interpretation.

Conclusions:

• Further research integrating field studies, lab experiments, and mechanistic modeling is needed.
• Long-term monitoring sites are recommended to bridge scales and improve deposition pathway understanding.
• Closing knowledge gaps will enhance quantification of ozone's impact on air quality, ecosystems, and climate.