The EUREC 4 A turbulence dataset derived from the SAFIRE ATR 42 aircraft

Abstract. During the EUREC4A field experiment that took place over the tropical Atlantic ocean, East of Barbados, the French ATR 42 environment research aircraft of SAFIRE aimed at characterizing the shallow cloud properties near cloud-base, and the turbulent structure of the subcloud-layer. For this purpose, the aircraft payload included radar and lidar remote sensing, microphysical probes, a laser spectrometer, and meteorological sensors. In particular, the aicraft was equipped with a 5-hole radome nose and several temperature and moisture sensors allowing for measurements of wind, temperature and humidity at a fast rate (25 Hz). This paper presents the high frequency measurements made with these sensors and their translation in terms of turbulent fluctuations, turbulent moments and characteristic length scales of the turbulence. A particular focus is put on the calibration and the quality control of the air moisture measurements, which remain a challenge at fine scales. Level-2 and Level-3 data are distributed as an ensemble of NetCDF files available to the public at AERIS ( https://doi.org/10.25326/128 ; Brilouet et al. 2020).