A two-dimensional hydrodynamic model of turbulent transfer of CO2 and H2O over a heterogeneous land surface

3rd International Conference Environment and Sustainable Development of Territories: Ecological Challenges of the 21st Century

生态环境科学;地球科学;经济学

Mukhartova, Yu V.^1 ; Krupenko, A.S.^1 ; Mangura, P.A.^1 ; Levashova, N.T.^1

Moscow State University, Faculty of Physics, Leninskie Gory, Moscow

119991, Russia^1

关键词: Atmospheric surface layers;    Complex topographies;    Eddy covariance technique;    Heterogeneous land surfaces;    Numerical experiments;    Standard deviation;    Turbulent transfer;    Two-dimensional hydrodynamic modeling;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/107/1/012103/pdf
DOI  :  10.1088/1755-1315/107/1/012103

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

A two-dimensional hydrodynamic model was developed and applied to describe turbulent fluxes of CO2and H2O within the atmospheric surface layer over a heterogeneous land surface featuring mosaic vegetation and complex topography. Numerical experiments were carried out with a 4.5-km profile that crosses a hilly region in the central part of European Russia, with the diverse land-use patterns (bare soil, crop areas, grasslands, and forests). The results showed very strong variability of the vertical and horizontal turbulent CO2and H2O fluxes. The standard deviations of the vertical fluxes were estimated for separate profile sections with uniform vegetation cover for daylight conditions in summer, and they were comparable with the mean vertical fluxes for corresponding sections. The highest horizontal turbulent fluxes occurred at the boundaries between different plant communities and at irregularities in surface profile. In some cases, these fluxes reached 10-20% of the absolute values of the mean vertical fluxes for corresponding profile sections. Significant errors in estimating the local and integrated fluxes e.g. when using the eddy covariance technique, can result from ignoring the surface topography, even in the case of relatively large plots with uniform vegetation cover.