[{"name":"oden-ao-2018-micromet-icefloe-3","title":"Micrometeorological data from an ice-floe adjacent to an open lead during the Arctic Ocean 2018 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 on a 2-metre mast at a measurement location adjacent to a lead (referred to as the open-lead site), approximately 2 km from icebreaker Oden\u2019s mooring location during the ice-camp period of the Arctic Ocean 2018 expedition (also referred to as MOCCHA-ACAS-ICE) to the High Arctic.","citations":"","comments":"The instrumentation on the open lead mast consisted of a Metek uSonic-3 heated sonic anemometer, a LI-COR 7500 infrared gas analyser, a LI-COR 7200 infrared gas analyser and pump, a Heitronics KT15.IIp infrared temperature sensor, an aspirated TRH sensor, a TSI 3762 CPC, a GPS unit and a Pro-Oceanus CO2-Pro CV pCO\u2082 sensor. Power was provided by 12V batteries, exchanged daily.\r\n\r\n\r\nThe majority of the fast-response instrumentation measured at 20Hz. Atmosphere-surface fluxes were determined from the fast-response measurements using eddy covariance. All wind measurements are ice-relative (no correction for ice-drift velocity). Anemometer winds have an aliasing correction applied prior to flux calculation, removing all signal above 5Hz.\r\n\r\n\r\nCO\u2082 flux and atmospheric concentration, and condensation particle counter (CPC) particle number concentrations, will be published in separate data sets and are not included here.\r\n\r\n\r\nThe surface through which the measured flux is occurring will depend on the wind direction and the (highly variable) dimensions of the open lead. Lead dimensions were measured throughout the expedition and flux footprint analysis will be published with a subsequent version of this dataset. Surface temperature measurements from the mast infrared sensor were primarily of the lead surface water (excluding periods when drifting ice was in the sensor field of view). Measurements of ice-surface temperature (from an infrared sensor mounted on Oden) are also included in this dataset for reference.\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 open-lead mast 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\nVersion history\r\nVersion 3\r\nCorrects an error in the quality control of the open-path Licor 7500 IR gas analyser.\n\r\nVersion 2\r\nInitial release.\r\n\r\nVersion 1\r\nNot published.","category":"Atmosphere","subcategory":"Micrometeorology","keywords":"Micrometeorological data; Air-sea interaction; Eddy covariance; Arctic Ocean 2018;  AO2018; AO18; Meteorology; Arctic boundary layer; Arctic clouds; High Arctic; ACAS","scientist":"John Prytherch","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 are part of the Arctic Climate Across Scales (ACAS) project, funded by the Knut and Alice Wallenberg Foundation. Project PI Michael Tjernstr\u00f6m (MISU). The project was also partly funded by the Bolin Centre for Climate Research.","publisher":"Bolin Centre Database","version":"3","constrains":"None","access":"Free"}]