[{"title":"Wind profiler moment data from the high-Arctic ASCOS expedition 2008","summary":"Wind profiler moment data was obtained using a Doppler radar wind profilers transmitting at 449MHz. Using the Doppler shift of the return signals and algebra, the wind speed and direction as a function of height, can be estimated. The wind profiler is sensitive to water vapor in the atmosphere and hence performs best in moist air. It was deployed at the start of the ice drift and was located on the port side top of three containers on the roof of the foredeck lab at the icebreaker Oden and operated through the rest of the expedition.","citations":"Tjernstr\u00f6m, M. et al. 2014. The Arctic Summer Cloud Ocean Study (ASCOS): overview and experimental design. Atmospheric Chemistry and Physics, 14, 2823\u20132869. DOI:10.5194\/acp-14-2823-2014","comments":"Two Doppler wind profilers were used in ASCOS; one radar profiler transmitting at 449MHz and one SODAR (SOund Detection and Ranging) transmitting audible sound pulses at several wave lengths. Both work from the same principles, transmitting beams at an angle to the vertical in different directions. Using the Doppler shift of the return signals and algebra the wind speed and direction can be estimated. Both instruments are phased-array instruments, meaning that there are no moveable parts generating the different beams at different angles; this is instead accomplished electronically.\nThe 449MHz wind profiler is sensitive to water vapor in the atmosphere and hence has the best results in moist air, and was deployed at the start of the ice drift on top of the port three containers located on the roof of the foredeck lab and operated through the rest of the expedition. Its return signal strength can, in addition to the Doppler information, be used to analyze the vertical structure of the atmosphere but only in a relative sense since the water vapor content is variable. \nThe SODAR is sensitive to water vapor fluctuations (turbulence) and its return signal can therefore, in addition to the Doppler information, be used to derive information about turbulence in the boundary layer. The SODAR is sensitive to ambient noise and hence was deployed on the ice and only operated during the ice drift.Original address: http:\/\/www.ascos.se\/index.php?q=node\/280\n\n\nFiles:\nASCOS_data_449windprofiler_moments_netcdf_v1.ZIP (37.99 MB)\n\n","category":"Atmosphere","subcategory":"Wind","keywords":"ASCOS; Meteorology; High Arctic; Arctic boundary layer; Arctic clouds; Wind profilers","scientist":"Ola Persson","firstname":"Michael","lastname":"Tjernstr\u00f6m","address":"Department of Meteorology; 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 Summer Cloud-Ocean Study 2008 (Ascos)","publisher":"Bolin Centre Database","version":"1.0","constrains":"None","access":"Free"}]