讲座报告 Seminar
[午餐交流会] 第六十四讲:南大西洋亚热带锋面的不稳定性及其对浮游植物藻华的影响  
Luncheon Seminars #64: Frontal Instabilities in the South Atlantic Subtropical Front and their Impact on Phytoplankton Blooms
【时间 Time】:2016-9-26 (星期一) 11:40-13:30    【浏览次数 Count】:415   【发布时间 Updated】:2016-9-20
【地点 Venue】:周隆泉楼A3-206   A3-206 Zhou Long Quan Bldg
【主讲人 Speaker】:Paulo Henrique Rezende Calil   
【来访单位 Institution】:Instituto de Oceanografia, Universidade Federal do Rio Grande, Brazil,Brazil   
【邀请人 Host】:罗亚威  Yawei Luo      【联络人 Contact】:罗亚威   Yawei Luo, ywluo@xmu.edu.cn

Abstract:

Subtropical fronts are key regions in the world’s oceans as they provide the connection between the dynamically and biogeochemically different subpolar and subtropical oceans. Understanding the mechanisms that modulate the exchange of properties between these regions is not only locally important but may also help explain long-term changes that affect the climate system and may be sensitive to such exchanges. In this study, focus is given to the importance of submesoscale processes in triggering phytoplankton blooms at the subtropical front in the South Atlantic Ocean. A basin-wide model configuration is nested with a higher resolution domain within the frontal region in order to study the exchange of physical properties as well biologically active tracers. On average, a stronger zonal baroclinic jet is observed in the high-resolution domain. Frontal instabilities generated by imbalances in the thermal wind induce rapid changes in the mixed layer depth and generates more episodic blooms with slightly larger biomass during periods when surface stratification is increased. Nonlinearities associated with the Ekman dynamics seem to be responsible for the generation of large vertical velocities and are more important in the high-resolution domain because of larger gradients in relative vorticity.

 

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