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Abstract:
Conductivity-Temperature-Depth (CTD) profiles from Norwegian Polar Institute cruise AO-2022 to the Nansen and Amundsen Basins of the Arctic Ocean. The dataset includes profiles of temperature, conductivity, dissolved oxygen and coloured dissolved organic matter fluorescence (CDOM) and laboratory measurements of salinity, dissolved oxygen, chlorophyll and CDOM from Niskin bottle samples.
Quality
Please refer to the AO-2022 cruise report for full information. Profiles were collected with either the primary (moonpool) or auxiliary (over-the-side) SBE911+ CTD system. Temperature profiles were measured using SBE 03 temperature sensors SN 6498 (primary CTD system, primary sensor) & SN 2400 (auxiliary CTD system, primary sensor). Conductivity profiles were measured using SBE 04 conductivity sensors SN 4726 (primary CTD system, primary sensor) & SN 3447 (auxiliary CTD system, primary sensor). Salinity profiles were calculated from temperature and salinity profiles. Dissolved oxygen concentration profiles were measured with SBE43 sensor SN 3648 (primary CTD system, secondary sensor). CDOM was measured with WETLabs CDOM fluorometer SN FLCDRTD-1930 (casts <= 134) & SN FLCDRTD-4531 (casts >= 135) (Primary System, single sensor). Laboratory salinity from Niskin bottle samples was determined using Guildline Portasal SN 70166, standardised with OSIL P-series standard seawater before & after every set of 24 measurements. Samples of dissolved oxygen from Niskin bottles samples were measured by automated Winkler titration using a potentiometric electrode relative to NPI internal standard “NPI-OXY-01” which was run before each batch of 48 samples. Triplicate samples for Winkler titration were drawn from each Niskin bottle sampled.
Profile data is from down casts only and made available in 1 decibar bins. Spurious data collected during the surface soak and/or passage though the moonpool shaft were removed before binning. Parameters measured from niskin bottle samples are discreet measurements.
The data are in a single, self-documented netCDF file. Profile data are organised in tables with one column per cast and one row per depth bin. Bottle data are organised in tables with one column per cast and one row per niskin bottle. 1-dimensional metadata (such as time and position) are organised as a single row with one column per cast. 2-dimensional metadata relate to niskin bottle data (such as sample numbers) and are organised in tables with one column per cast and one row per niskin bottle. All variables have the same number of columns, equal to the total number of CTD casts.