A new-generation 3D ozone FACE (Free Air Controlled Exposure)

Area of Science:

• Environmental Science
• Plant Biology
• Atmospheric Chemistry

Background:

• Ground-level ozone (O3) significantly impacts vegetation, necessitating accurate simulation methods.
• Ozone Free Air Controlled Exposure (FACE) systems are crucial for understanding these impacts.
• Existing systems have limitations, driving the need for advanced simulation technologies.

Purpose of the Study:

• To introduce a novel, next-generation three-dimensional ozone FACE system.
• To detail the system's design, including O3 diffusion, generation, and exposure protocols.
• To establish principles for calculating relative yield/biomass and estimating O3 impacts on vegetation.

Main Methods:

• Development of a new 3D ozone FACE system with laser-generated micro-holes for O3 diffusion.
• Integration of pre-mixing of air and O3, and an O3 generator with an oxygen generator.
• Implementation of continuous (day/night) exposure with full replication across three O3 levels.

Main Results:

• The FO3X system represents a unique ozone FACE in a Mediterranean climate.
• It is one of the few systems capable of investigating multiple stressors simultaneously.
• The system provides a framework for estimating O3 impacts across various concentration levels.

Conclusions:

• The described ozone FACE system offers a significant advancement in simulating O3 effects on vegetation.
• This technology will facilitate more accurate assessments of O3 impacts on plant yield and biomass globally.
• Further research into O3 impacts on vegetation worldwide will be propelled by this innovative system.