Aircraft measurements of the boundary layer structure over Nares Strait (Greenland) during campaign IKAPOS with POLAR 5 on 2010-06-15

Gap flows and the stable boundary layer were studied in northwest Greenland during the aircraft-based experiment IKAPOS (Investigation of Katabatic winds and Polynyas during Summer) in June 2010. The measurements were performed using the research aircraft POLAR 5 of Alfred Wegener Institute (AWI, Bremerhaven, Wesche et al. 2016). Besides navigational and basic meteorological instrumentation, the aircraft was equipped with radiation and surface temperature sensors and with a turbulence measurement system. The calibration procedure is described in Drüe and Heinemann (2013). A detailed description of the experimental setup, the flight missions and the aircraft sensors are given in the field phase report (Heinemann et al. 2011) and in Heinemann (2018). The vertical profiles were flown as slantwise aircraft profiles (ascents or descents). The data were measured at a sampling rate of 100 Hz. For the profiles, a more convenient 1 Hz subset was extracted from the 100 Hz data set and turbulent fluctuations are filtered out using a low-pass filter of 0.05 Hz. Four flight missions were flown over the Nares Strait and the North Water (NOW) polynya: 15, 18, 22, and 23 June 2010. The data are consecutive vertical profiles flown along the Nares Strait and across Nares Strait at different positions (see Heinemann et al. 2011) for plots and coordinates of starting points (also included in the data). Data of temperature, potential temperature, specific humidity, wind speed and direction are included in the data set.2010年6月，依托机载实验IKAPOS（Investigation of Katabatic winds and Polynyas during Summer，夏季下坡风与冰间湖调查），对格陵兰西北部的间隙流与稳定边界层开展了研究。本实验的观测搭载于阿尔弗雷德·魏格纳研究所（Alfred Wegener Institute, AWI，不来梅哈芬）的POLAR 5号科研飞机完成（Wesche等，2016）。除导航与基础气象观测仪器外，该飞机还搭载了辐射传感器、表面温度传感器以及湍流测量系统。其定标流程详见Drüe与Heinemann（2013）的研究。实验布设方案、飞行任务及机载传感器的详细说明参见野外阶段报告（Heinemann等，2011）与Heinemann（2018）的相关研究。垂直廓线采用斜向飞行廓线（爬升或下降）的方式获取。原始数据采样率为100 Hz。针对廓线数据，从100 Hz原始数据集提取了1 Hz的精简子集，并通过0.05 Hz的低通滤波器滤除湍流脉动信号。2010年6月15日、18日、22日及23日，共开展了4次针对内尔斯海峡（Nares Strait）与北水冰间湖（North Water polynya, NOW）的飞行任务。本数据集包含沿内尔斯海峡及不同跨海峡位置获取的连续垂直廓线，其起始点的绘图信息与坐标详见Heinemann等（2011）的研究，且该信息亦包含于本数据集之中。本数据集包含温度、位温、比湿、风速及风向的观测数据。