loading page

Euphotic Zone Depth Anomaly in Global Mesoscale Eddies by Multi-mission Fusion Data
  • Yan Wang,
  • Jie Yang,
  • Ge Chen
Yan Wang

Corresponding Author:yan.wang77@outlook.com

Author Profile
Jie Yang

Corresponding Author:yangjie2016@ouc.edu.cn

Author Profile


As the waters of marine primary production, the euphotic zone is the primary living environment for aquatic organisms. Eddies account for 90% of the ocean’s kinetic energy and affect marine organisms’ habitats by the excitation of vertical velocities and the horizontal advection of nutrients and ecosystems. Satellite observations indicate that anticyclones mainly deepen the euphotic zone depth, while cyclones do the opposite. Eddy-induced euphotic zone depth is inversely correlated with the eddy-induced chlorophyll concentration. The anomalies reach 5m on average in the region of high eddy amplitude and frequent eddy occurrence. In addition, we found that the anomalies have an extreme value in each of the 5°-23° and 23°-55° and reach a maximum at around 40 degrees with the increase of latitude. Secondly, the anomalies are characterized by large near-summer and small near-winter. In the eddy-center coordinate system, the minus gradient direction of the negative anomaly is consistent with the background flow field and the direction of eddy movement. Meanwhile, the anomaly increases along the radial direction to about 0.2r and then decreases. Finally, there is a significant linear correlation between the anomaly magnitude and eddy amplitude. The conclusion of this research and related mechanism explanation contributes to marine biology research and conservation, estimates of marine primary productivity, and understanding of the biogeochemical properties of eddy modulation in the upper water column.