Turbulent Flux Mass Evaluation and Contribution Region Analysis of the Underlying Surface in Southern Sichuan Forest
Received date: 2023-01-16
Revised date: 2023-03-27
Online published: 2024-01-11
As flux observations are susceptible to complex underlying surface and instrument accuracy, rigorous pre-processing and quality control of the raw data is required based on the principles of the Eddy Covariance system observations.In this study, turbulence observations of the eddy-related system from May to December 2021 were selected from the Si'e Mountain Forest in the southern Sichuan region, and the observations were set up at different heights, including within the rough sublayer, at the boundary between the rough sublayer and the normal flux layer, and within the normal flux layer.The variability of the turbulent flux calculations under the two coordinate rotation schemes is quantified by the above observations and the quality of the flux data series is evaluated in conjunction with turbulence stability and development tests.Finally, the range of variability of the flux contribution region represented by the footprint function is analyzed for different atmospheric stability and different observation heights.The results show that the flux data corrected by the double coordinate rotation are larger than those from the plane fit and that the difference in correction between the two is significant with increasing observation height.Regarding flux data quality features, sensible heat flux data quality is better than latent heat flux and CO2 flux, and lower data quality is better than higher data quality.At observation heights of 38 m and 56 m, the dominant wind direction showed opposite day and night variations in northeast-northwest direction, especially from May to September.There is some variation in the range of flux contributions at different levels of atmospheric stability.Under atmospheric stability, 80% of the flux information at 38 m altitude comes from the area 50~1400 m west of the tower; under atmospheric instability, the horizontal range of the source area for flux measurements is between 0 and 500 m.At an observation height of 56 m and under stable atmospheric conditions, the boundary of the source area with 80% flux contribution can be up to 1500 m from the measurement point; under unstable conditions, the source area lies between 0 and 750 m.There is a significant difference in the size of the contribution zone between winter and summer under stable atmospheric conditions, with the maximum turbulent flux information coming from 1320 m and 700 m in summer and winter respectively at an observation height of 38 m.The distribution of the flux contribution zone is influenced by the observation height for the same atmospheric stability, with the flux source zone at 56 m observation height being larger than the flux source zone at 38 m.
Demin FAN , Yu ZHANG , Youqi SU , Qian ZHANG . Turbulent Flux Mass Evaluation and Contribution Region Analysis of the Underlying Surface in Southern Sichuan Forest[J]. Plateau Meteorology, 2024 , 43(1) : 227 -240 . DOI: 10.7522/j.issn.1000-0534.2023.00027
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