Long term monitoring of atmospheric wet and dry depositions and associated nutrients fluxes was conducted on the coast of Japan facing the East China Sea continuously for 1 year and 2 months, with the origin of air mass investigated based on isotope analyses (Sr, Nd, and NO₃). During the same period, intensive observations of ocean conditions and the chemical composition of sinking particles collected using sediment traps were conducted to investigate the effects of atmospheric deposition-derived nutrients on phytoplankton blooms. Dry-deposition-derived nutrient inputs to the surface ocean were larger during autumn to spring than in summer due to the effect of continental air mass occasionally carrying Asian dust (yellow sand). However, these nutrients fluxes were limited (1.1–1.5 mg-N m⁻² day⁻¹ on average) and didn't appear to cause phytoplankton blooms through the year. Although average dissolved inorganic nitrogen (DIN) concentrations in rainwater were lower in oceanic air masses compared to continental air masses, wet-deposition-derived nutrient inputs to the surface ocean on rainy days during the summer (26.0 mg-N m⁻² day⁻¹ on average) were large due to higher precipitation from oceanic air masses. Wet-deposition-derived nutrients significantly increased nutrient concentrations in the surface ocean and seemed to cause phytoplankton blooms in the warm rainy season when nutrients in the surface were depleted due to increased stratification. The increase in phytoplankton biomass was reflected in increased particle sinking into the bottom layer, as well as changing chemical characteristics. The supply of flesh phytoplankton-derived labile organic matter into the bottom layer could be expected to promote rapid bacterial decomposition and contribute to the formation of hypoxic water masses in early summer when the ocean was strongly stratified. Atmospheric deposition-derived nutrients in East Asia will have important impacts on not only the oligotrophic outer ocean but also surrounding coastal areas in the warm rainy season.

在面向东海的日本海岸连续 1 年零 2 个月对大气干湿沉降和相关营养物质通量进行了长期监测，并基于同位素分析（Sr、Nd 和没有₃）。在同一时期，对海洋状况和使用沉积物捕集器收集的下沉颗粒的化学成分进行了深入观察，以研究大气沉积衍生的营养物质对浮游植物大量繁殖的影响。由于大陆气团偶尔携带亚洲尘埃（黄沙）的影响，秋季至春季对表层海洋的干沉积衍生的养分输入量大于夏季。然而，这些养分通量是有限的（1.1-1.5 mg-N m ^-2平均第^-1天）并且似乎不会导致全年浮游植物大量繁殖。尽管与大陆气团相比，海洋气团中雨水中的平均溶解无机氮 (DIN) 浓度较低，但在夏季雨天（26.0 mg-N m ^-2天^{- ）}，湿沉积衍生的营养物质输入到表层海洋。¹由于海洋气团的降水量增加，平均而言）很大。湿沉积衍生的养分显着增加了表层海洋中的养分浓度，并且在温暖的雨季由于分层增加而导致表层养分耗尽时，似乎会导致浮游植物大量繁殖。浮游植物生物量的增加反映在沉入底层的颗粒增加以及化学特性的变化。预计将浮游植物来源的肉质不稳定有机物质供应到底层会促进细菌的快速分解，并有助于在海洋强烈分层的初夏形成缺氧水团。