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Anthropogenic-Biogenic Interaction Drives Chloride Depletion in Coastal Atmosphere
Aijing Song1, Kun Li1,2, Zhaomin Yang1
1Qingdao Key Laboratory for Prevention and Control of Atmospheric Pollution in Coastal Cities, Environment Research Institute, Shandong University, Qingdao 266237, China.
Environmental Science & Technology
|May 4, 2026
Summary
Chloride depletion from sea salt aerosols (SSA) is influenced by nitrogen oxides (NOx) and isoprene. This study reveals how these factors interact, impacting atmospheric chemistry and forming new chlorinated compounds.
Area of Science:
- Atmospheric chemistry
- Environmental science
- Chemical oceanography
Background:
- Chloride depletion from sea salt aerosols (SSA) is a critical coastal atmospheric process.
- Existing models show discrepancies with field observations, suggesting unknown mechanisms.
Purpose of the Study:
- To investigate chloride depletion driven by nitrogen oxides (NOx) and its interaction with isoprene.
- To understand the role of anthropogenic and biogenic emissions in coastal atmospheric processes.
Main Methods:
- Utilized chamber experiments to study chloride depletion under varying NOx levels.
- Employed experimental and modeling approaches to identify key reaction pathways.
- Analyzed the influence of isoprene on NOx-induced chloride depletion.
Main Results:
- Chloride depletion showed a nonlinear dependence on NOx, peaking at 24.4% with increasing NOx.
- Oxidant-initiated reactions (OH, NO3) were identified as primary drivers of chloride depletion.
- Isoprene modulated NOx-induced depletion, causing suppression at low NOx and enhancement at high NOx.
Conclusions:
- Reactive chlorine from chloride depletion contributes to the formation of observed organic chlorinated compounds.
- This research clarifies anthropogenic-biogenic interactions in coastal atmospheric chloride depletion.
- Provides evidence for the formation of organic chlorinated compounds in coastal aerosols.
Keywords:
anthropogenic-biogenic interactionchloride depletioncoastal atmosphereorganic chlorinated compoundssea salt aerosolsMore Related Videos
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