High-frequency observation during sand and dust storms at the Qingtu Lake Observatory

[摘要] Partially due to global climate change, sand and dust storms (SDSs)have occurred more and more frequently, yet a detailed measurement of SDS eventsat different heights is still lacking. Here we provide a high-frequencyobservation from the Qingtu Lake Observation Array (QLOA), China. The wind anddust information were measured simultaneously at different wall-normal heightsduring the SDS process. The datasets span the period from 17 March to 9 June2016. The wind speed and direction are recorded by a sonic anemometer with asampling frequency of 50  Hz , while particulate matter with a diameter of 10  µm or less ( PM 10 ) is sampled simultaneously by a dust monitor with a samplingfrequency of 1  Hz . The wall-normal array had 11 sonic anemometers and monitorsspaced logarithmically from z =0.9 to 30  m , where the spacing isabout 2  m between the sonic anemometer and dust monitor at the sameheight. Based on its nonstationary feature, an SDS event can be dividedinto three stages, i.e., ascending, stabilizing and descending stages, inwhich the dynamic mechanism of the wind and dust fields might be different.This is preliminarily characterized by the classical Fourier power analysis.Temporal evolution of the scaling exponent from Fourier power analysissuggests a value slightly below the classical Kolmogorov value of - 5 / 3 for thethree-dimensional homogeneous and isotropic turbulence. During the stabilizingstage, the collected PM 10 shows a very intermittent pattern, whichcan be further linked with the burst events in the turbulent atmosphericboundary layer. This dataset is valuable for a better understanding ofSDS dynamics and is publicly available in a Zenodo repository at https://doi.org/10.5281/zenodo.5034196 ( Li et al. ,  2021 a ) .

[学科分类] 眼科学