ROV exploration of deep-water coral habitats of southwest Australian submarine canyons – water column chemistry data, 2020

Cruise FK200126 was the first ROV exploration of the Bremer canyon systems, Mount Gabi seamount, and nearby continental margins located in the all-important yet poorly studied Southern Ocean offshore SW Australia, and revisited the Perth Canyon in the SE Indian Ocean which represents only the second ROV exploration of that area. The cruise focused on the collection of deep-water corals for post-cruise geochemical studies to reconstruct long-term environmental changes in this region, together with comprehensive characterisation of their present-day environments including physical and chemical oceanography, canyon geomorphology and geology, bathymetric mapping, faunal descriptions, and the first high resolution video imaging of these previously unexplored deep-water habitats.

The NetCDF file contains CTD data and seawater carbonate parameters measured from seawater samples collected on board the SOI Falkor between 2020-01-26T09:18:56 and 2020-02-20T21:32:29, by 12-L Niskin bottles. Temperature and Salinity were measured using a SBE-911plus CTD, Dissolved Oxygen using a SBE-43 DO sensor and Fluorescence by a Wet Labs ECO-FLNTU; Total Alkalinity was measured using a Mettler-Toledo T50 with Rondolino autosampler; DIC was measured using an Apollo SciTech Dissolved Inorganic Carbon analyser; pH, aragonite and calcite saturation states were calculated using version 1.1 of CO2SYS for MATLAB’.

FK200126号科考航次是针对澳大利亚西南近海南大洋（该区域至关重要却鲜有系统研究）的布雷默海谷系统、加比山海山及邻近大陆边缘开展的首次遥控无人潜水器（Remotely Operated Vehicle, ROV）探查任务，同时重返了东南印度洋的珀斯海谷——该区域仅实施过第二次ROV探查。本航次核心目标为采集深水珊瑚，用于航次后地球化学研究以重建该区域的长期环境变化；同时对其现存环境开展全面表征，涵盖物理海洋学与化学海洋学参数、海谷地貌与地质特征、水深测绘、动物群描述，以及对这些此前未被探查的深水生境开展首次高分辨率视频成像。

本NetCDF文件包含2020年1月26日09:18:56至2020年2月20日21:32:29期间，在SOI Falkor号科考船上通过12升尼斯金采水器采集的海水样本所测得的温盐深（Conductivity, Temperature, Depth, CTD）数据与海水碳酸盐体系参数。其中，水温与盐度采用SBE-911plus型CTD测定，溶解氧采用SBE-43型溶解氧传感器测定，荧光值由Wet Labs ECO-FLNTU传感器获取；总碱度通过配备Rondolino自动进样器的梅特勒-托利多（Mettler-Toledo）T50分析仪测定；溶解无机碳（Dissolved Inorganic Carbon, DIC）采用Apollo SciTech公司的溶解无机碳分析仪检测；pH值、文石与方解石饱和状态则通过MATLAB平台的CO2SYS v1.1版本计算得到。