http://bolin.su.se/data/oden-ryder-2019-micromet-oden-1 John Prytherch, Michael Tjernström Bolin Centre Database 2021 Datafile Atmosphere Micrometeorology Air-sea interaction Meteorology Eddy covariance Arctic boundary layer Greenland Fjord Northwest Passage Ryder 2019 expedition Icebreaker Oden ACAS Earth science > Atmosphere John Prytherch 2021-04-29T14:12:37+00:00 English 1 None Micrometeorology data from icebreaker Oden’s foremast, averaged over either 1 or 30-minute intervals. Flux data are not included in the 1-minute files. System operated by John Prytherch and Michael Tjernström (MISU). Two data formats are available: Matlab (.mat) and NetCDF (.nc) with an accompanying readme (.rtf) file. The instrumentation on the foremast consisted of a Metek uSonic-3 heated sonic anemometer, a LI-COR 7500 infrared gas analyser, an aspirated TRH sensor, and an XSENS MTiG 3-axis inertial motion unit. Wind measurements were corrected for platform motion following Edson et al. (1998; Direct covariance flux estimates from mobile platforms at sea. J. Atmos. Ocean. Tech, 15, 547-562) and Prytherch et al. (2015: Motion-correlated flow distortion and wave-induced biases in air-sea flux measurements from ships. Atmos. Chem. Phys., 15, 10619–10629). 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 150deg of bow on. An empirical adjustment to the model was derived from a comparison of the foremast wind measurements with those measured on the 15 m mast during the AO2018 ice camp. The majority of the fast-response instrumentation measured at 20 Hz. Atmosphere-surface fluxes were determined from the fast-response measurements using eddy covariance. Metek anemometer winds have an aliasing correction applied prior to flux calculation, removing all signal above 5 Hz. Quality control flagging follows Foken et al. (2012): Chapter 4 in Eddy Covariance: A practical guide to measurement and data analysis (eds. M. Aubinet, T. Vesala, D. Papale), Springer Atmospheric Sciences, and references therein: Foken and Wichura (1996) and Vickers and Mahrt (1997). Some of the code implementing these was adapted from the [Eddycalc](http://www.swissfluxnet.ch/eddycalc/html/Eddycalc_LI7200.html) suite. Data from the foremast are combined into a cruise-length file. The data are time-averaged to both 1-minute and 30-minute intervals. Flux data are not included in the 1-minute files. Coordinates (lat, lon) for the observations are not included in this dataset, but they are the same as in the [Weather data from MISU weather station during Ryder 2019 and Northwest passage 2019 expeditions](https://bolin.su.se/data/oden-ryder-2019-misu-weather). Data were collected during the NorthWest Passage 2019 expedition and the [Ryder 2019 expedition](https://polarforskningsportalen.se/en/arctic/expeditions/ryder-2019) on board the Swedish icebreaker (I/B) Oden, which was organized by the Swedish Polar Research Secretariat.