EM-APEX float data collected from a standing meander near the Macquarie Ridge south of Australia

The ‘Data’ folder contains the quality-controlled data from 7 Electromagnetic Autonomous Profiling Exploer (EM-APEX) floats in which 6 were deployed in a standing meander, between the southeast Indian Ridge and the Macquarie Ridge, which we call the Macquarie meander. The floats were deployed as part of the Dynamics of Eddy Fluxes Energised by Currents over Topography (DEFLECT) project aimed to observe, quantify, and understand the ACC jet, meander, mesoscale eddy and topography interaction processes and resolve competing hypotheses that govern the strength of the ACC and its response to changes in forcing. The voyage took place aboard RV Investigator between 16 October – 11 November 2018. Three of the floats (EM-8495, EM-8496 and EM-8497) were deployed later in September 2020 in the same meander location. Each of the floats profiled for about six months between 145-170°E, 50-60°S.One of the floats in the data (EM-7789) was deployed in the Subantarctic Front of the ACC southeast of New Zealand in 2016.There are two data types in the folder. The .mat file contains all the profiles as sent by the floats but quality controlled. The netcdf files contain the quality-controlled data from each float (named with the hull number of each float) which were interpolated into a uniform pressure-profile number grid. While the .mat file contains all the variables which were generated as part of the quality-control procedures, the netcdf files contain only the temperature, salinity, time, and horizontal velocity (absolute and relative velocity) data in a grid.Details of the data quality control procedures for the EM-APEX floats are provided in the document ‘EM-APEX QC manual.pdf’. Contact A/Prof. Helen Phillips ([e-mail]), Institute for Marine and Antarctic Studies, Tasmania, Australia for a full-voyage report and additional information.

‘Data’文件夹包含7台电磁自主剖面探测浮标（Electromagnetic Autonomous Profiling Exploer，EM-APEX）经质量控制后的观测数据。其中6台浮标布放在东南印度洋海岭与麦夸里海岭之间的驻留弯曲流区域，我们将该区域命名为麦夸里弯曲流区。本数据集所用浮标为‘地形环流驱动涡旋通量动力学（Dynamics of Eddy Fluxes Energised by Currents over Topography，DEFLECT）’项目的组成部分，该项目旨在观测、量化并解析南极绕极流（Antarctic Circumpolar Current，ACC）急流、弯曲流、中尺度涡与地形的相互作用过程，厘清调控南极绕极流强度及其对强迫变化响应的竞争性假说。本次航次于2018年10月16日至11月11日期间搭载‘RV Investigator’号科考船执行。另有3台浮标（EM-8495、EM-8496与EM-8497）于2020年9月在同一弯曲流区域完成布放。每台浮标均在东经145°-170°、南纬50°-60°的海域开展了约6个月的剖面观测。其中一台浮标（EM-7789）于2016年在新西兰东南部的南极绕极流亚极锋区完成布放。该文件夹内包含两类数据：.mat格式文件存储了浮标传回的所有剖面数据且已完成质量控制；netCDF格式文件则包含各台浮标经质量控制后的观测数据（以浮标壳体编号命名），这些数据已被插值至统一的压力-剖面编号网格中。与存储了质量控制流程生成的全部变量的.mat文件不同，netCDF文件仅保留了温度、盐度、时间以及水平流速（绝对流速与相对流速）的网格化数据。EM-APEX浮标的数据质量控制流程细节可参阅文档《EM-APEX QC manual.pdf》。如需获取完整航次报告与额外信息，请联系澳大利亚塔斯马尼亚大学海洋与南极研究所的海伦·菲利普斯副教授（[e-mail]）。