CLIVAR I9 transect and Kerguelen Plateau Deep Western Boundary Current Experiment, Aurora Australis marine science cruise au0403 - ship-based CTD and ADCP data

Oceanographic measurements were conducted in the Southern Ocean Indian sector during the southern summer of 2004/2005 on Aurora Australis voyage au0403, V3 2004/2005. Data were collected during a complete occupation of CLIVAR meridional section I9S; and then along a transect up the northeastern flank of the Kerguelen Plateau, south across the Princess Elizabeth Trough and onward to the Antarctic continental shelf. A total of 115 CTD vertical profile stations were taken, most to within 30 m of the bottom. Over 2450 Niskin bottle water samples were collected for the measurement of salinity, dissolved oxygen, nutrients, CFCs, dissolved inorganic carbon, alkalinity, oxygen-18, methane, selenium and biological parameters, using a 24 bottle rosette sampler. Full depth current profiles were collected by a lowered acoustic Doppler profiler (LADCP) attached to the rosette package, while near surface current data were collected by a ship mounted ADCP. An array of 8 current meter and thermosalinograph moorings, deployed 2 years earlier on cruise au0304, were recovered from the vicinity of the Kerguelen Plateau.Ship's underway data (including bathymetry, met. sensors and sea surface parameters) are included in the cruise data set; an offset correction was applied to the underway sea surface salinity and temperature data, derived from comparison with near surface CTD data.A summary of all data and important data quality information is presented in the data report. LADCP data are not included in this data set.This work was completed as part of ASAC projects 2312 and 2572.

2004/2005年南半球夏季，研究团队于南大洋印度洋扇区开展海洋学观测作业，搭载“极光号”（Aurora Australis）执行航次au0403，对应V3航段2004/2005。观测完整覆盖CLIVAR经向断面I9S；随后沿凯尔盖朗高原东北侧翼布设观测断面，向南穿越伊丽莎白公主海槽，最终抵达南极大陆架海域。本次作业共获取115个温盐深剖面仪（CTD）垂直剖面站位，多数测站的观测深度距海底不足30米。研究团队借助24瓶采水器组，采集超过2450个尼斯金采水器水样，用于测定盐度、溶解氧、营养盐、氯氟烃（CFCs）、溶解无机碳、碱度、氧-18、甲烷、硒及生物相关参数。采水器组搭载下放式声学多普勒流速剖面仪（LADCP），获取全水深流速剖面数据；近表层海流数据则通过船载ADCP采集获得。2年前于航次au0304布放的8套海流计与温盐计锚系观测阵列，在凯尔盖朗高原附近海域被成功回收。本航次数据集包含船舶走航数据（涵盖水深地形、气象传感器及海面参数）；研究人员通过与近表层CTD数据比对，对走航海面盐度与温度数据实施了偏移校正。数据报告中汇总了全部数据集及重要的数据质量控制信息。本数据集未包含LADCP数据。本研究作为ASAC项目2312与2572的组成部分完成。