卫星海洋环境监测预警全国重点实验室为增进学术交流，促进实验室对外开放，组织系列“海星系列学术讲座”，邀请国内外知名专家与青年科研人员分享前沿科学动态，讨论最新学术成果，欢迎大家踊跃参加。

召集人：谢晓辉 研究员

会议时间：12月26日（周五）10:00-11:30

会议地点：1号楼610会议室

报告人：李仁健 博士后（加州大学圣塔芭芭拉分校） 

报告题目：Constraining Seasonality in Global Ocean’s Biological Pump Pathways with Data-Assimilated Model

报告人简介：李仁健，加州大学圣塔芭芭拉分校博士后，2023年博士毕业于马里兰大学帕克分校，研究方向为河口动力与环境、大洋环流与碳循环，近五年在JPO、GRL等国际主流期刊发表学术论文7篇。

报告简介：The ocean’s biological carbon pump transports organic carbon from the surface to depth via three main pathways: the gravitational sinking of particles, active transport by vertically migrating zooplankton, and mixing and advection of suspended and dissolved organic carbon. Here, we use a global data-assimilated ocean biogeochemical model to diagnose the seasonal variability of carbon export and sequestration by these gravitational, migrant, and mixing pumps. The seasonality of the export and sequestration pathways is highly variable, especially in the high latitudes. In subpolar regions, the seasonal amplitude of the pumps is ~40-60% of the annual mean: export and sequestration by the gravitational and migrant pumps peak in the summer, while the mixing pump strongly opposes this seasonality, reaching a maximum during the winter. In subtropical regions, the seasonality of gravitational and migrant pump export is weak, while mixing pump export shows strong seasonality with a peak during spring. The seasonal data-constrained model helps examine the seasonal biases in the samplings used to estimate export efficiency (“e-ratio”) and particle transfer efficiency, demonstrating the importance of seasonal observations and models to understand the processes regulating carbon export and sequestration.