Turbulent structures at the bottom of the Gobi desert boundary layer and their impact on aeolian sand transport and dust emission
Description
This dataset was designed to examine the behavior of turbulent flow structures over gobi surfaces and the impact of these structures on the sand transport rate and dust emission flux. Synchronous high-frequency measurements of two time series of 3-D wind speed(1Hz), PM10 concentration(1Hz) and saltating particle count rate (1Hz) over a gobi surface (40.04°N, 94.79°E) in two transport events (10:27 to 14:23 on May 12, 2021, and 14:12 to 16:30 on May 21, 2021) have been presented. Wind velocity was measured by a RM Young 81000 Ultrasonic anemometer, situated at the height of 0.4 m above the gobi surface at a time interval of 1 s, recorded by a Campbell CR 1000 datalogger. The profile of saltating grain number was measured by two piezoelectric impact sensors (H11-LIN, Sensit) at heights of 0.01and 0.05 m above the gobi surface with a measurement frequency of 1 Hz, also recorded by a Campbell CR 1000 datalogger. The PM10 concentration was measured using the U.S. handheld 3016 laser particle counter at heights of 0.05and 0.3 m above the gobi surface. The particle size monitoring range was 0.3~25μm, and the data collecting interval was set to 1s. Aeolian saltation flux profiles over gobi were measured by a sand traps deployed at heights of 0-0.025 m and 0.025-0.05m. Sand transport rate at 1 Hz can be obtained based on high-frequency time series of Sensit particle counts and low-frequency flux measurements of sand traps.