TY  - Data
T1  - Heihe River eco hydrological remote sensing experiment: multi scale observation experiment of surface evapotranspiration over non-uniform underlying surface flux observation matrix dataset (eddy covariance at point 11-2012)
A1  - Liu shaomin
DO  - 10.12072/ncdc.NIEER.db0042.2020
PY  - 2021
DA  - 2021-08-27
PB  - National Cryosphere Desert Data Center
AB  - The data set contains the eddy related flux observation data of point 11 in the flux observation matrix from May 29 to September 18, 2012. The station is located in the farmland of Yingke Irrigation District, Zhangye City, Gansu Province, with corn as the underlying surface. The longitude and latitude of the observation point are 100.34197e, 38.86991n, and the altitude is 1575.65m. The eddy correlator frame is 3.5m high, the sampling frequency is 10Hz, the ultrasonic direction is due north, and the distance between the ultrasonic anemometer and CO2 / H2O analyzer is 15cm.The original observation data of eddy correlator is 10Hz. The released data is the 30 minute data post processed by edire software. The main processing steps include: field value elimination, delay time correction, coordinate rotation (quadratic coordinate rotation), frequency response correction, ultrasonic virtual temperature correction and density (WPL) correction. At the same time, the quality of each flux value is evaluated, mainly the atmospheric stability（ Δ St) and turbulence similarity characteristics (ITC).The 30 min flux value output by edire software is also screened: (1) eliminate the data when the instrument is wrong（ 2) Eliminate the data 1H before and after precipitation（ 3) Eliminate the data with a loss rate of more than 3% every 30min of 10Hz original data（ 4) Eliminate the observation data of weak turbulence at night (U * less than 0.1M / s).The average period of observation data is 30 minutes, 48 data a day, and the missing data is marked as - 6999. Suspicious data caused by instrument drift and other reasons shall be identified in red font.The published observation data include: date / time, wind direction WDIR (°), horizontal wind speed wnd (M / s), standard deviation of lateral wind speed STD_ Uy (M / s), ultrasonic virtual temperature TV (℃), water vapor density H2O (g / m3), carbon dioxide concentration CO2 (mg / m3), friction velocity ustar (M / s), stability Z / L (dimens
DB  - NCDC
UR  - http://www.ncdc.ac.cn/portal/metadata/0951fd5f-a682-4b48-b65f-e20eb9f32018
ER  -