[{"title":"Micrometeorological data from icebreaker Oden\u2019s foremast during the Arctic Ocean 2016 expedition","summary":"Fast response (20Hz) measurements of the 3-dimensional wind vector, temperature and humidity, derived micrometeorological variables, and mean meteorological measurements. The measurements are from instrumentation mounted at approximately 20 m above sea level on icebreaker Oden\u2019s foremast during the Arctic Ocean 2016 expedition to the High Arctic.","citations":"","comments":"The instrumentation on the foremast consisted of a Gill R3 sonic anemometer, a LI-COR 7500 infrared gas analyser, an aspirated TRH sensor, an XSENS MTiG 3-axis inertial motion unit (managed by ICAS, University of Leeds). Other instrumentation included an LGR fast response greenhouse gas analyser installed at the base of the mast with an inlet drawing air at the top of the mast (managed by Department of Geological Sciences, Stockholm University).\r\n\r\n\r\nWind 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\u201310629).\r\n\r\n\r\nWinds 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 150\u00b0 of bow on (PROVIDE COMPLETE REFERENCES HERE: Yelland et al., 2002 JTech; Moat et al., 2015). Winds are then adjusted to Earth frame using GPS measurements.\r\n\r\n\r\nThe majority of the fast-response instrumentation is measured at 20Hz. Atmosphere-surface fluxes were determined from the fast-response measurements using eddy covariance.\r\n\r\n\r\nCO\u2082 and CH\u2084 flux and atmospheric concentrations will be published in separate data sets and are not included here.\r\n\r\n\r\nQuality 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 suite.\r\n\r\n\r\nData 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.\r\n\r\n\r\nCoordinates (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 the Arctic Ocean 2016 expedition.\r\n\r\n\r\nMore information about the Canadian-Swedish Arctic Ocean 2016 expedition is available from the Swedish Polar Research Secretariat.","category":"Atmosphere","subcategory":"Observations","keywords":"Micrometeorological data; Meteorology; Air-sea interaction; Eddy covariance; Arctic boundary layer; Arctic clouds; High Arctic; Arctic Ocean 2016; AO2016; AO16; ACAS; Oden","scientist":"Michael Tjernstr\u00f6m, Ian Brooks","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 2016 expedition. 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 for Climate Research, Stockholm University","version":"2.0","constrains":"None","access":"Free"}]