Two large aperture scintillators, bls450 and zzlas, were set up respectively. The site is located in donghuayuan Town, Huailai County, Hebei Province. The longitude and latitude of the observation point are 115.7880e, 40.3491n and 480m above sea level. The effective height of the large aperture scintillator is 14m, the optical path length is 1870m, the longitude and latitude of the transmitting end are 115.8023e, 40.3596n, and the longitude and latitude of the receiving end are 115.7825e, 40.3522n. The acquisition frequency of bls450 and zzlas is 5Hz and 1Hz respectively, with an average output of 1min.

The original data of the large aperture scintillation instrument is 1min, and the published data is 30min average data after processing and quality control. The sensible heat flux is mainly obtained through iterative calculation based on the Monin obkhov similarity theory in combination with the data of the automatic weather station. In the iterative calculation process, for bls450, thiermann and Grassl are selected, For zzlas, Andreas, 1988 is chosen as the stability universal function.

The main quality control steps include: (1) removing the data when cn2 reaches saturation; (2) removing the data with weak demodulation signal intensity; (3) removing the data at precipitation time and one hour before and after precipitation; (4) removing the data with weak turbulence under stable conditions (U * less than 0.1m/s).