Hydrography, oxygen, fluorescence and turbidity data from the KASEAOPE-1 cruise (2023), south of New Caledonia, southwest Pacific

Abstract

Context and scientific abstract. The KASEAOPE-1 cruise is the first cruise of a series of cruises that take place south of New Caledonia in the Parc Naturel de la Mer de Corail (PNMC). The series of cruises is part of the ScInObs project (Science, Innovations and Underwater Observatories) funded by Ifremer. It is also part of a collaboration with JAMSTEC, Japan. The scientific objective is to better understand the functioning of ecosystems thriving over seamounts in the PNMC. Specifically, we wish to investigate how environmental factors such as geological substratum and hydrology and currents (intensity, turbulence) influence benthic and mesopelagic populations. Sustained observations at high temporal resolution will enable the joint measurement of relevant biological and environmental variables at scales appropriate for understanding ecosystems, with the aim of contributing to reliable predictive models on a regional scale. The data will also enable us to study current/topography interactions, or how seamounts impact the lifecycle of internal waves (mostly tidal) and (sub)mesoscale eddies. The KASEAOPE-1 cruise enabled the first elements of the observatory to be deployed: a pilot mooring line equipped with numerous measuring and sampling instruments on the northern slope of Mount Stylaster (Norfolk Ridge), and a camera-equipped EDOKKO observation module from JAMSTEC deployed on the summit of the mound. Surface acquisitions with EK80 and ADCP echosounders were carried out day and night, along transects on Stylaster and Munida mounds, in order to map the mesopelagic communities. Rosette CTD profiles were also produced to calibrate the oxygen and salinity probes. Description of the dataset. This dataset contains the following qualified datasets from KASEAOPE-1 : Thermosalinograph (TSG) data Hydrographic CTD-O2, fluorescence and turbidity data O2 and salinity from Niskin bottles