As funded by natural science foundation of China (NSFC) since 2018, this project focus on the submesoscale variability and the temporal evolution of the biogeochemistry especially the export productivity within the mesoscale cyclonic eddies. In doing so, a month-long campaign will be carried out in the prominent cyclonic eddies in the Northwest Pacific Ocean off Taiwan in spring of 2019 (Eddy SILICON). Three critical questions are proposed for this survey:

• How do submesoscale processes of a cyclonic eddy modulate the spatial variability of carbon and opal exports?
• how does eddy evolution affect carbon and opal exports?
• Are the exports of carbon and opal coupled or decoupled on the spatial scale during the submesoscale variability and on the temporal scale during eddy evolution?