Diapycnal Fluxes due to Mixed Layer Processes in the Southern Ocean

0136546/Tandon该项目将计算南大洋表层混合层过程引起的昼夜通量。由此产生的通量是利用倒箱模型和水文数据估计南大洋三维环流等应用所需的重要投入。将使用的方法是强迫具有高时间分辨率的地面通量场的混合层模式，该模式是从气象分析产品获得的。该模型将用于确定混合层浮力、深度和夹带率。这些性质与根据水文数据确定的浮力梯度相结合，可以用来确定与加深和小规模混合有关的混合层底部的逐日通量。还将估计与中尺度涡旋搅动有关的日平均通量，并确定净日平均通量。目前，南大洋上层海洋昼夜通量的大小存在很大的不确定性。预计对这些通量及其变异性作出更可靠的估计将使研究人员能够从世界海洋环流实验期间收集的数据中更清楚地了解南大洋的侧向环流和倾覆环流。

0136546/TandonThis project will compute the diapycnal fluxes due to surface mixed-layer processes in the Southern Ocean. The resulting fluxes are important inputs needed for such applications as the estimation of the three-dimensional circulation of the Southern ocean using inverse box models and hydrographic data. The approach that will be used is to force a mixed-layer model with surface flux fields with high temporal resolution, obtained from meteorological analysis products. This model will be used to determine mixed-layer buoyancy, depth and entrainment rates. These properties, when combined with buoyancy gradients determined from hydrographic data, can be used to determine the diapycnal flux across the base of the mixed layer associated with deepening and small-scale mixing. The diapycnal flux associated with stirring by mesoscale eddies will also be estimated and a net diapycnal flux determined. At present, there is significant uncertainty about the size of upper-ocean diapycnal fluxes in the Southern Ocean. It is anticipated that more robust estimates of these fluxes and their variability will enable investigators to gain a much clearer picture of the lateral and overturning circulation in the Southern Ocean from data collected during the World Ocean Circulation Experiment.