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

上层海洋混合层（UOML）中的Langmuir环流（LC）是一种最常见的特征，即近似平行于风向的线性条纹或海面条纹。这是由于螺旋状（卵形）水细胞顺时针和逆时针旋转，在表面形成交汇（下行）和发散（上升流）交替带。风速决定了这些循环单元的深度和间距。作为UOML中表面更新的驱动因素，LC可能负责诸如发散区捕获和浮游植物向上运输到表面以及辐合区收集和下沉表面活性剂和可转移气体到水柱中的过程。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的数值模拟研究扩展到南极海洋学感兴趣的两个主题，首先，a)南极夏季光场下浮游植物初级生产力的光抑制（包括表面紫外线穿透的影响），以及可能的b)海气交换的参数化。两个最近的现场数据集，包括罗斯海多聚体的生产力研究和南大洋气体实验（SO-GasEx），将构成现场数据与使用大涡模拟（LES）进行LC效应精细数值计算的比较基础。“这项奖励是根据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)."