Collaborative Research: Impact of Langmuir Circulation on Gas Transfer and Photosynthesis in the Southern Ocean: A Large Eddy Simulation Study

海洋混合层上层的朗缪尔环流（LC）是一种最常见的观测特征，表现为近似平行于风向的线性条纹或海面条纹。这些结果从螺旋（卵形）水细胞顺时针和逆时针旋转，形成交替带的收敛（下降流）和发散（上升流）的表面。风速决定了这些环流单元的深度和间距。作为UOML中表面更新的驱动器，LC可能负责诸如扩散区捕获和浮游植物向上运输到表面以及会聚区收集和表面活性剂和可转移气体下沉到水柱中的过程。南佛罗里达大学和史密森尼研究中心的研究人员希望将LC影响的数值模拟研究扩展到南极海洋学的两个感兴趣的主题，首先，a）南极夏季光场下浮游植物初级生产力的光抑制（包括表面紫外线渗透的影响），可能的话，B）海-气气体交换的参数化。最近的两个领域的数据集，包括生产力研究在罗斯海玻利尼亚和南大洋天然气实验（SO-GasEx）将形成的基础上，使用大涡模拟（LES）的LC效应的细尺度数值计算的现场数据进行比较。“该奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。"

Langmuir circulation (LC) in the upper ocean mixed layer (UOML) is a feature most familiarly observed as linear stripes or sea surface streaks approximately parallel to the wind direction. These result from helical (ovoid) water cells rotating clockwise and anticlockwise, forming alternating bands of convergence (downwelling) and divergence (upwelling) at the surface. Windspeed determines the depth and the spacings of these circulation cells. As a driver of surface renewal in the UOML, LC may then be responsible for processes such as divergence zone capture and transport of phytoplankton upwards to the surface and the convergence zone collection and sinking of surfactants and transferable gases into the water column. Investigators from the University of South Florida and the Smithsonian Research Center wish to extend numerical modeling studies of the effects of LC on two topics of interest to Antarctic oceanography, firstly, a) photoinhibition of the primary productivity of phytoplankton under Antarctic summer light fields (including effects of surface UV penetration) and possibly, b) parameterizations of sea-air gas exchange. Two recent field data sets including productivity studies in the Ross Sea polyna and the Southern Ocean Gas Experiment (SO-GasEx) will form the basis for comparisons of field data with fine scale numerical computations of LC effects using large-eddy simulations (LES). "This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5)."