John Prytherch Weather data from MISU weather station during the Arctic Ocean 2018 expedition Bolin Centre Database 2021 Datafile Atmosphere Weather observations Ship log and weather station Weather station Arctic Ocean AO2018 AO18 Meteorology Arctic boundary layer Arctic clouds High Arctic ACAS Icebreaker Oden Earth science > Atmosphere John Prytherch 2021-03-03T09:30:17+00:00 English 3.0 Data from the MISU weather station, averaged over either 1 or 30-minute intervals. System operated by John Prytherch and Michael Tjernström (MISU). Three data formats are available: Matlab (.mat), NetCDF (.nc) and comma separated value (.csv) text, with an accompanying readme (.rtf) file. The main components of the MISU weather station (Gill 2D sonic anemometer, Rotronic aspirated TRH, Vaisala PTU pressure sensor, Eppley PIR and PSP downwelling radiation sensors) were mounted mid-ship on the 7th deck forward railing. The Heitronics KT15.IIp infrared sensor for measurement of surface temperature was mounted separately on the 7th deck, to enable measurement of the sea/ice surface to beam of the ship. During the ice-drift portion of the expedition, the infrared sensor was moved between beams following ship turns to ensure it measured from the main ice floe. An additional Rotronic aspirated TRH sensor was mounted at the top of Oden’s foremast. Winds are measured relative to the ship. The ship acts to distort the wind speed and direction, increasingly so for winds away from bow-on. A computational fluid dynamics (CFD) model of airflow over Oden is used to correct the measured winds for wind directions within 110° of bow on. Due to the significant distortion at the site of the weather station, weather station winds should be treated with caution for wind directions more than 60° from bow on. The ship-relative winds and navigation data are also used to derive ‘true’ wind speed and direction. Downwelling radiation sensors were subject to icing during the expedition. Ice was removed with regular cleaning. Clear-sky radiation determined from radiosonde measurements and RRTM simulations was used to provide further quality control. A flag is provided to indicate when solar radiation may be affected by shading from the ship superstructure. The Rotronic TRH mounted on the foremast is biased high (by approximately 1 °C and 1⁠ – ⁠2 % RH), due to cable compensation effects on the analogue measurement. Data from the system are combined into a cruise-length file. The data are time-averaged to both 1-minute and 30-minute intervals, to correspond with the micrometeorological averaging periods used for the mast sensors. Data were collected during the Arctic Ocean 2018 expedition on board the Swedish icebreaker (I/B) Oden, which was organized by the [Swedish Polar Research Secretariat]( #### Version history ##### Version 3.0 swdclr interpolation using spline (rather than linear). Slight amendment to PSP flagging procedure. ##### Version 2.0 Initial release. ##### Version 1.0 Not published.