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，在“南极光”号（Aurora Australis）科考航次au0403、V3 2004/2005期间，于南大洋印度洋扇区开展了海洋观测作业。观测数据采集覆盖了气候变率与可预报性计划（CLIVAR）的完整I9S经向断面，随后沿凯尔盖朗海台（Kerguelen Plateau）东北侧翼布设断面航线，向南横穿伊丽莎白公主海槽（Princess Elizabeth Trough），最终抵达南极大陆架。本次作业共获取115个温盐深仪（CTD）垂直剖面站位数据，绝大多数站位的观测深度仅距海底30米以内。研究团队借助24瓶式采水器组（rosette sampler）采集了超过2450个尼斯金采水器（Niskin bottle）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同位素、甲烷、硒及生物相关参数。依托搭载于采水器组的下放式声学多普勒流速剖面仪（LADCP）获取了全水深海流剖面数据，而近表层海流数据则通过船载声学多普勒流速剖面仪（ADCP）采集得到。于本次航次两年前的au0304航次中布放的8套海流计与温盐记录仪锚系阵列，在凯尔盖朗海台附近区域被回收。本航次数据集包含船舶走航观测数据（涵盖海底地形、气象传感器及海面参数）；研究人员通过与近表层温盐深仪数据对比，对走航观测的海面盐度与温度数据进行了偏移校正处理。所有数据及关键数据质量信息的汇总说明已收录于数据报告中，本数据集未包含下放式声学多普勒流速剖面仪（LADCP）数据。本研究作为南极科学咨询委员会（ASAC）项目2312与2572的一部分完成。