TY  - Data
T1  - HiWATER: Dataset of Hydrometeorological observation network (eddy covariance system of Dashalong station, 2013)
A1  - Li Xin
A1  - CHE Tao 
A1  - Xu ziwei
A1  - Zhang Yang
A1  - Tan Junlei
PY  - 2026
DA  - 2026-04-16
PB  - National Cryosphere Desert Data Center
AB  - This dataset contains the eddy covariance instrument observation data from August 12, 2013 to December 31, 2013 at Dashalong Station on the Heihe Hydrological and Meteorological Observation Network. The station is located in Qilian County, Qinghai Province, with a swamp meadow as the underlying surface. The latitude and longitude of the observation point are 98.9406E, 38.8399N, and the altitude is 3739 meters. The height of the eddy covariance instrument is 4.5 meters, the sampling frequency is 10 Hz, the ultrasonic direction is due north, and the distance between the ultrasonic wind speed temperature instrument and the CO2/H2O analyzer is 15 cm. The original observation data of the eddy covariance instrument is 10 Hz, and the published data is 30 minutes of data processed using Edire software. The main processing steps include outlier removal, delay time correction, coordinate rotation (secondary coordinate rotation), frequency response correction, ultrasonic virtual temperature correction, and density (WPL) correction. Simultaneously evaluate the quality of each flux value, mainly by testing the atmospheric stationarity (Δ st) and turbulence similarity characteristics (ITC). The 30 minute flux values output by Edire software were also screened: (1) data with instrument errors were excluded; (2) Exclude data from 1 hour before and after precipitation; (3) Exclude data with a missing rate greater than 3% every 30 minutes from the original 10Hz data; (4) Exclude observation data of weak turbulence at night (u * less than 0.1m/s). The average period of observation data is 30 minutes, with 48 data points per day. Missing data is marked as -6999. Suspicious data caused by instrument drift and other reasons are marked in red font. The observed data released includes: date/time Date/Time, wind direction Wdir (°), horizontal wind speed Wnd (m/s), lateral wind speed standard deviation Std-Uy (m/s), ultrasonic virtual temperature Tv (℃), water vapor density H2O (g/m3), carbo
DB  - NCDC
UR  - http://www.ncdc.ac.cn/portal/metadata/e3015f37-8624-45a2-88a7-b739890c5238
ER  -