Emission and enrichment of coastal viable and non-viable bacteria during ocean-atmosphere transfer.
Yuhong Feng, Yingyi Zhang, Zhaokang Ruan, Bowen Duan, Linyao Wu, Y. J. Tham, S. Lai
🤖 gxceed AI 要約
日本語
中国・万山島での観測により、海水中の生菌がエアロゾル中の生菌の主な供給源であること、生菌は非生菌よりも海から大気へ選択的に濃縮されることを示した。生菌の放出は海水の生菌濃度とクロロフィルaに強く相関し、非生菌の挙動は降雨などの大気過程に支配される。生菌のフラックスは約18 cells/m2/sで、氷核形成への寄与が示唆される。
English
Field observations at Wanshan Island, southern China, show that viable bacteria in aerosols originate mainly from seawater and are preferentially enriched during sea-to-air transfer (enrichment factor 236 vs. 143 for non-viable). Viable bacterial emission is correlated with seawater viable bacteria and chlorophyll a (r=0.910), while non-viable bacteria are controlled by atmospheric processes. The viable bacterial flux is ~18 cells/m2/s, highlighting potential impacts on ice nucleation and cloud condensation.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
本論文は海洋微生物の大気への移行メカニズムを解明しており、日本の沿岸域でのエアロゾル研究や気候モデルの精緻化に参考となる。ただし、日本のGX政策やSSBJ等の開示基準との直接的な関連は薄い。
In the global GX context
This study reveals the preferential enrichment of viable bacteria in sea spray aerosols, which has implications for understanding marine microbial contributions to atmospheric chemistry and climate forcing. While not directly related to GX frameworks (ISSB/TCFD), it provides scientific input for climate models that inform climate risk assessments.
👥 読者別の含意
🔬研究者:Provides field evidence for viability-dependent bacterial enrichment during sea-to-air transfer, useful for refining aerosol and climate models.
📄 Abstract（原文）
Airborne bacteria significantly influence the environment, climate, and public health. The nature and extent of these impacts, however, can vary depending on bacterial viability. To understand the sources and controlling factors of viable and non-viable bacteria in coastal aerosols, we investigated their temporal variations, cell size distributions, and enrichment during sea-to-air transfer at Wanshan Island, southern China. Viable bacteria in aerosols showed strong correlations with those in seawater in both concentration (r = 0.783) and cell size distribution, indicating a dominant seawater origin. Their emission was jointly enhanced by seawater viable bacterial abundance and chlorophyll a (r = 0.910). In contrast, non-viable bacteria showed no such correlation and exhibited distinct size patterns, and were primarily influenced by rainfall, sea surface temperature, and relative humidity, suggesting they are controlled by atmospheric physical processes. During sea-to-air transfer, viable bacteria were preferentially enriched with an enrichment factor of 236 compared to non-viable bacteria (143). Although viable bacteria account for only 13% of total bacteria in seawater, their contribution to the emission flux rises to approximately 20% (18.4 cells m-2 s-1). The estimated viable bacterial productivity flux is 2.3 × 10-7 g C m-2 d-1. Given the higher enrichment of viable bacteria in sea spray aerosols, their potential contribution to ice nucleation and cloud condensation processes in coastal regions needs further investigation. These findings highlight the importance of distinguishing between viable and non-viable bacteria in assessing marine microbial impacts on atmospheric chemistry, carbon cycling, and climate.
🔗 Provenance — このレコードを発見したソース
- semanticscholar https://doi.org/10.1016/j.marenvres.2026.108165first seen 2026-06-29 09:04:54
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