Diapycnal Fluxes due to Mixed Layer Processes in the Southern Ocean

南大洋混合层过程引起的径流通量

• 批准号: 0136546
• 负责人: Amit Tandon
• 金额: $ 17.38万
• 依托单位: University of Massachusetts, Dartmouth
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-04-01 至 2005-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0136546&HistoricalAwards=false
• 关键词: Diapycnal; Fluxes; due; Mixed; Layer

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.

0136546/Tandon本项目将计算南大洋表层混合层过程引起的纵贯通量。 由此产生的通量是使用逆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。 将使用的方法是强制混合层模式，其表面通量场具有高时间分辨率，从气象分析产品中获得。该模型将用于确定混合层浮力、深度和卷吸率。 这些属性，结合从水文数据确定的浮力梯度，可以用来确定贯穿与加深和小规模混合的混合层的基础的diapycnal通量。 还将估计与中尺度涡旋搅动有关的横尺度通量，并确定净横尺度通量。 目前，南大洋上层海洋底流通量的大小存在很大的不确定性。 预计对这些通量及其变化的更可靠估计将使调查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横向和翻转环流。