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/tandonis项目将由于南大洋的表面混合层过程来计算二元通量。 所得的通量是使用逆框模型和水文数据估算南大洋三维循环的应用所需的重要输入。 将使用的方法是迫使具有高时间分辨率的表面通量场的混合层模型，该模型是从气象分析产物获得的。该模型将用于确定混合浮力，深度和夹带率。 当这些特性与由水文数据确定的浮力梯度结合在一起时，可用于确定与加深和小规模混合相关的混合层底部的透明通量。 还将估算与中尺度涡流搅拌相关的Diapynal通量，并确定净大型通量。 目前，南大洋上的上海二比通量的大小存在很大的不确定性。 可以预计，这些通量及其可变性将使研究人员从世界海洋循环实验期间收集的数据中获得更清晰的横向和翻转循环，从而使研究人员能够更清楚地了解这些通量的估计。