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Summary
Peroxyacetyl nitrate (PAN) acts as a stable atmospheric reservoir for nitrogen oxides (NOx), enabling their transport. This study reveals PAN
Area of Science:
- Atmospheric chemistry
- Environmental science
- Geochemistry
Background:
- Nitrogen oxides (NOx) are crucial for atmospheric processes like ozone and acid formation.
- NOx's short lifetime limits its transport, but organic forms like PAN can store and transport NOx.
- PAN is stable in the upper troposphere and releases NOx in warmer conditions.
Purpose of the Study:
- To present the first global distribution of PAN.
- To assess PAN's significance as an NOx reservoir.
- To validate tropospheric reactive nitrogen chemistry theory.
Main Methods:
- Extensive shipboard measurements.
- Extensive aircraft measurements.
Main Results:
- PAN is more abundant in the Northern Hemisphere than the Southern Hemisphere.
- PAN is more abundant in continental than marine tropospheres.
- PAN concentrations are higher in winter than summer, contrary to polluted atmospheres.
Conclusions:
- PAN is a significant NOx reservoir and transport mechanism in the troposphere.
- Global PAN distribution varies geographically and seasonally.
- Measurements support and extend current reactive nitrogen chemistry models.