河流排放对沿海海洋过程的影响是多维的。关于下沉粒子通量的研究,沿海海洋的组成及其季节性变化非常有限。在这项研究中,我们调查了河流流量对总质量下沉通量季节性变化的影响,以河流为主的大陆边缘的生物和成岩物质,孟加拉湾西部沿海。更高的POC,在西南季风早期发现了成岩和总质量通量,并与河流流量高峰和初级生产提高脱钩。这归因于架子区域重新悬浮的表层沉积物的跨架运输。河流流量高峰,其次是叶绿素a升高,这表明尽管河流流量支持初级生产,但养分供应。元素C:N比,δ13C和δ15N的结果可能表明海洋和陆地来源都导致了POM的下沉,.总的来说,西南季风期间的下沉通量高于一年中的其他时间,这表明季节性河流流量对孟加拉湾西部沿海的下沉通量产生了相当大的影响。
Impacts of river discharge on coastal ocean processes are multi-dimensional. Studies on sinking particle fluxes, composition and their seasonal variability in coastal oceans are very limited. In this study, we investigated the impact of river discharge on seasonal variability in sinking fluxes of total mass, biogenic and lithogenic material in a river-dominated continental margin, western coastal Bay of Bengal. Higher POC, lithogenic and total mass fluxes were found during early southwest monsoon, and are decoupled with peak river discharge and elevated primary production. It is attributed to cross-shelf transport of re-suspended surface sediments from shelf region. Peak river discharge followed by elevated chlorophyll-a suggest nutrients supply though river discharge support primary production. Elemental C:N ratios, δ13C and δ15N results likely suggest that both marine and terrestrial sources contributed to sinking POM, . Overall, higher sinking fluxes during southwest monsoon than rest of the year suggest that seasonal river discharge exerts considerable impact on sinking fluxes in the western coastal Bay of Bengal.