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

从RAFOS浮标获得的RossbyRaw数据，作为大西洋环流和气候实验的一部分，将进行处理、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水域的路径图；(B)确定横跨北大西洋洋流交换的位置和过程；(C)绘制漂浮物密度面上的溶解氧场图；(D)获取该区域颗粒位移的统计数据。此外，还将进行一次短暂的巡航，以找回花车用于导航的水下声源。这些科学任务旨在阐明亚极地和亚热带北大西洋水域的交换方式，并将有助于加深对该海洋中经向热量传输的了解。9908091Padman/Egbert在这项工作中，次表层海流计数据将被同化为韦德尔海潮流的二维和三维数值模型。将使用逆方法来指导改进对日涡度波和底部边界层中的摩擦的影响的参数化。由于韦德尔海接近主半日潮汐的临界纬度，层结较弱，底部边界层较厚，潮汐气流相对正压，简化了模拟任务，使海流计更好地表征了潮流。

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.