2025-08-28 ワシントン大学セントルイス校
Web要約 の発言：
＜関連情報＞
- https://source.washu.edu/2025/08/when-waves-meet-the-shore-sea-spray-levels-up/
- https://www.science.org/doi/10.1126/sciadv.adw0343
海岸線における激しい波の砕けは沿岸の海水飛沫エアロゾル濃度を著しく増大させる：気候と大気質への影響 Shoreline wave breaking strongly enhances the coastal sea spray aerosol population: Climate and air quality implications
Shengqian Zhou, Matthew Salter, Timothy Bertram, Eduardo Brito Azevedo, […] , and Jian Wang
Science Advances Published:27 Aug 2025
DOI:https://doi.org/10.1126/sciadv.adw0343
Abstract
Sea spray aerosol (SSA) emission is a major source of atmospheric aerosols, influencing global climate and coastal air quality. Much of our knowledge about SSA derives from coastal observations near shorelines, but whether and when these observations accurately represent open oceans remain unclear. Here, we show that strong nearshore SSA production during high-wave periods greatly enhances downwind cloud condensation nuclei (CCN) and aerosol mass concentrations. Strong shoreline wave breaking is widespread globally, and swell waves, which are decoupled from local winds, play a dominant role in many coastal regions. Therefore, extrapolating results based on coastal measurements to open oceans may significantly overestimate SSA concentration and its contribution to CCN and, by extension, the impact of SSA on clouds and climate. Additionally, the strong enhancement of coastal aerosol population by shoreline wave breaking and its environmental impact on coastal communities cannot be captured by current regional models, which do not parameterize nearshore SSA generation using wave energy or completely neglect it.
