[{"name":"oden-ao-2018-navigation-1","title":"Navigation, meteorological and surface seawater data from the Arctic Ocean 2018 expedition","summary":"Measurements from icebreaker Oden\u2019s navigation, meteorological and surface seawater systems from the Arctic Ocean 2018 (AO2018, also referred to as MOCCHA-ACAS-ICE) expedition to the central Arctic Ocean in August and September 2018.\r\n \r\nThe dataset provides rare meteorological and surface sea water observations from sea-ice regions of the Arctic Ocean, as well as Oden\u2019s navigation data. The data enable analysis of meteorological conditions and provide context for other measurements and analysis associated with the expedition.\r\n \r\nMeasurements of wind, temperature, humidity and pressure were made from sensors above Oden\u2019s bridge (25\u201335 m above sea level). Measurements of seawater properties (temperature, salinity, conductivity and sound velocity) were performed by sensors in the main laboratory on the pumped underway line, with an intake at 8 m depth. Water temperature was also measured with hull contact sensors located close to the underway line intake.","citations":"","comments":"Sensors are operated and maintained by the ship crew and the Swedish Polar Research Secretariat staff. The following processing was carried out post-expedition: (i) True winds were re-calculated from the measured ship-relative winds using the navigation data to correct an error in the original true wind calculation. (ii) Large variations in the underway line salinity measurement (resulting from variations in line flow speed due to e.g. ice blockages) were removed and interpolated over. A flag indicates interpolation. Other underway line measurements are not adjusted.\r\n\r\nData from the various systems are combined into a single, cruise-length file. The file is time-averaged to either 1-minute or 30-minute, to correspond with the micrometeorological averaging periods used for the mast sensors.\r\n\r\n#### Version history\r\n\r\n##### Version 1\r\nInitial release. Also known as version 1.1.","category":"Atmosphere","subcategory":"Observations","keywords":"Ship log; Arctic Ocean 2018; AO2018; AO18; Meteorology; Seawater temperature; Salinity; Ship navigation; Position and speed; High Arctic; ACAS","scientist":"John Prytherch, Michael Tjernstr\u00f6m","firstname":"John","lastname":"Prytherch","address":"Department of Meteorology (MISU); Stockholm University","postalcode":"SE-106 91","city":"Stockholm","province":"","country":"Sweden","parameters":"Earth science > Atmosphere","location":"Ocean > Arctic Ocean","progress":"Completed","language":"English","project":"Arctic Ocean 2018.  These data were processed as part of the Arctic Climate Across Scales (ACAS) project, funded by the Knut and Alice Wallenberg Foundation. Project PI Michael Tjernstr\u00f6m (MISU).","publisher":"Bolin Centre Database","version":"1","constrains":"None","access":"Free"}]