A Study of the Extension of the North Atlantic Current and Pathways of Exchange: Phase II - Data Analysis

作为大西洋环流和气候实验的一部分，从RAFOS浮标上获得的原始数据将被处理、质量控制，然后进行分析。处理后的数据将用于：(a)绘制北大西洋洋流经过大浅滩后的路径，(b)确定北大西洋洋流交换的位置和过程，(c)绘制密度表面上浮子后面的溶解氧场，以及(d)获得该地区颗粒位移的统计数据。此外，还将进行一次短途巡航，以回收浮标用于导航的水下声源。这些科学任务旨在阐明北大西洋亚极地和亚热带水域的交换方式，并将有助于了解该海洋的经向热输送。在这项工作中，地下流计数据将被同化成威德尔海潮汐流的二维和三维数值模型。逆方法将用于指导改进日涡度波和底部边界层摩擦效应的参数化。由于威德尔海靠近主要半日潮的临界纬度，分层作用弱，底层边界层厚，潮流相对正压，简化了建模任务，可以更好地利用海流表表征流。

9906775RossbyRaw data obtained from RAFOS floats, deployed as part of the Atlantic Circulation and Climate Experiment, will be processed, quality controlled, and then analyzed. The processed data will be used: (a) to map out the paths taken by the waters of the North Atlantic Current after it passes the Grand Banks, (b) to identify the locations of, and processes responsible for, exchange across the North Atlantic Current, (c) to map out the dissolved oxygen field on the density surface followed by the floats, and (d) to obtain statistics of particle displacements in the region. In addition, a short cruise will be made to recover the submerged sound sources used by the floats for navigation. The scientific tasks are designed to illuminate the way in which the waters of the subpolar and subtropical North Atlantic are exchanged and will contribute to developing an understanding of the meridional transport of heat in that ocean. 9908091Padman/EgbertIn this work, sub-surface current meter data will be assimilated into two and three-dimensional numerical models of tidal flows in the Weddell Sea. Inverse methods will be used to guide improvements of parameterizations of the effects of diurnal vorticity waves and of friction in the bottom boundary layer. Since the Weddell Sea is close to the critical latitudes for the main semi-diurnal tide and has weak stratification, the bottom boundary layer is thick and the tidal flow is relatively barotropic, simplifying the modeling task and allowing a better characterization of the flow by the current meters.